v0.8.0.10 — playtest fixes: clearance rulings, the log, the map, and a save file

From the first two multiplayer playtests of v0.8.0.9, each traced before fixing.

The engine:

- A train on a card BEHIND the one departing no longer triggers a clearance
  ruling or an opposite-direction bar (#26). Reproduced from the exported
  save: X15 was held over X18 behind it, and X18 then collided into the full
  Whistle Post. Games in progress holding a ruling the engine no longer asks
  for will not resume (28 of 40 recorded four-seat games); shipped as is at
  Jesse's call.
- `mainlineModified` carries the card's previous kind, so the log can say
  what a Realignment converted (#27).

The screen:

- The turn chart and the Division map name the player whose move is on
  screen while bot turns replay, not the live actor (#25).
- The owning player's name is no longer outlined by the turn arrow's stroke,
  which made it unreadable (#24).
- A Mainline card flashes on the map when a Realignment changes it (#28).
- The history is held back with the board and revealed step by step, instead
  of arriving whole while the board is still catching up (#29).
- A ruling made by holding the office reads "Superintendent Player X" (#30),
  and no line names a player twice (#31).
- A seated player can download their own game as a save file: the play
  page's Save replay button, fed by GET /api/save?token=… (#32). The StartOS
  action cannot do this — an action result is text only.

Closes #24
Closes #25
Closes #26
Closes #27
Closes #28
Closes #29
Closes #30
Closes #31
Closes #32

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017nnuCv8UodHucFfx3LWEoX

CHANGELOG.md

@@ -19,9 +19,761 @@ page as `v0.1.0 · <sha> · <date>`, so what is deployed can always be identifie
 
 ---
 
+## 0.8.0.10 — 2026-09-15
+
+Three reports from the first multiplayer playtest of v0.8.0.9 — one player and three bots — each traced
+to its cause before it was fixed.
+
+### The Superintendent is no longer asked about a train BEHIND the one departing (Gitea#26)
+
+*"Two westbound trains: X15 is further west on Mainline cards than X18. And I still get a Superintendent
+must rule... held X15 and then collision happened. X18 destroyed, but X15 fine."*
+
+**Reproduced by replaying the exported save.** At move 78, X15 was highballing west out of seat 3's
+Office while X18, also westbound, was still crossing the card to its EAST — behind it. Every Office was a
+Whistle Post, so the Subdivision ran the whole railroad, and `evaluateClearance` counted every train in it
+without asking which side of the departing train it stood on. The ruling was meaningless; holding X15
+kept the Whistle Post's only A/D track full, and X18 arrived into it and was destroyed. Unasked, X15 —
+the lower number, so the first to move — would have left and freed the track.
+
+§8.1 asks about a train the departing one would FOLLOW and one moving TOWARDS it, and both are ahead of
+it. So a train on a card strictly behind the departing train's own card is no longer counted, in either
+pass: a following train behind is no concern, and an oncoming one behind is moving away. A train on the
+SAME card is still counted, exactly as before — which of two trains sharing a card is in front is
+`entryConflict`'s region question. The other two rulings in the save (moves 37 and 530) were correct and
+are unchanged.
+
+A test had the fault written into it: its "train ahead" of an eastbound train was the first Mainline card
+in the Division, which is west of the Office. It now stands on a card the train would follow, and three
+new cases pin the rule: a same-direction train behind is not put to the Superintendent, an opposite-
+direction train behind does not bar the departure, and a same-direction train ahead still is. The tally
+test's seed moved from 42 to 44, because the collision seed 42 was chosen for was this bug.
+
+### Games in progress — MANY WILL NOT RESUME
+
+**This release changes when the engine asks for a ruling**, so a save holding a ruling it would no longer
+ask for stops replaying at that move: `mainline.clearance` is refused with `NO_PENDING_DECISION`. The
+server then refuses to resume that game and logs the move it stopped at, leaving the save untouched —
+putting v0.8.0.9 back would resume it. **Measured:** 40 four-seat co-op games recorded by bots under
+v0.8.0.9 and replayed under this release — 28 stop, usually 5–40% of the way in, most at a ruling on a
+train behind (about ten rulings a game were being asked). The exported playtest game stops at move 78.
+**Jesse's call (2026-09-15): no games in progress need keeping, so the fix ships as it is,** with no
+per-game switch preserving the old rule.
+
+### Six more from the same playtest (Gitea#27–#32)
+
+**A Realignment says which card it converted (#27).** *"It stated Mainline card 3 converted to plains. It
+should state that the mainline card 3 curves was converted to plains."* The event carried only what the
+card became, so the line could not name what it had been; `mainlineModified` now carries `from` as well —
+events are derived by replaying a save and never stored, so widening one strands nothing — and it reads
+"Realignment: Mainline card 3, Curves, converted to Plains".
+
+**And the map flashes it (#28).** *"Is it possible to flash the mainline card when it gets changed by
+realignment?"* The one play that changes the Division itself was invisible on the map of it.
+`changedDivisionCards` compares the two public boards the animation queue already holds — the same way a
+pile is lit — so the pulse lands with the step that shows the change rather than when the intent arrived,
+and it is shown to the player who made it too, unlike a lit pile. `prefers-reduced-motion` turns it off.
+
+**The history stops running ahead of the board (#29).** *"Does history display immediately for all bot
+turns... is it possible to stall history so it stays in sync with the number behind?"* A push carries its
+narration and its steps together, so every line of a bot's turn was in the panel before the board had
+drawn any of it. The queue now reports how many lines belong to steps not yet shown, and the panel holds
+back exactly those, revealing each as its step goes up. Skip still shows everything at once.
+
+**A ruling reads as the office's (#30).** *"If a player makes a move as a superintendent instead of as
+themselves maybe it could say 'Superintendent Player Tom'."* The three moves made by holding the office
+rather than in turn — §8.1's clearance, §11's Yard Office offer, §Q's Red Flag prompt — are prefixed that
+way. `clearanceGiven` carries no player at all (the office made it, whoever holds it), so the acting seat
+is what names it.
+
+**And it names them once (#31).** *"It gives the player's name and then their player number together."*
+`record()` prefixes the acting player's NAME for every event carrying `player`, and five narration lines
+embedded `Player <index>` themselves — phase ended, actor changed, the Red Flag ruling, the extension vote
+and the Yard Office ruling. The name is the log's job; the sentence is the narration's. A test now scans a
+played game's whole log for a bare player index.
+
+**A multiplayer game can be saved as a file (#32).** *"In the StartOS actions for the save game, I get a
+string I can copy. Most of the time, I want to just save it as a JSON file."* Not possible in the action
+itself: an action result member is text only — copyable, QR or masked, with nested groups — and the SDK
+has no file member. So it is done where it can be: the play page's "Save replay" button was shown only in
+solitaire, because a server-backed session has no local save to hand it. `GET /api/save?token=…` — the
+same seat token `/api/stream` and `/api/intent` use, not the administrative secret — hands a seated player
+their own game, and the button now appears in multiplayer.
+
+### "Waiting on" follows the move on screen (Gitea#25)
+
+*"Playing against 3 bots — waiting on always says me, even when it is someone else's turn."*
+
+The server plays every bot move the moment a human's turn ends, so the LIVE game is almost always waiting
+on the human — while the screen is still replaying those bots step by step. The turn chart and the
+Division map's move marker read the live actor, and contradicted the playback row naming the bot actually
+moving. `actorOnScreen` (`web/step-queue.ts`) answers with the player of the step on screen while the
+board is catching up, and the live actor once it has; during playback the chart also leaves off a live
+"asks … ruling" note that belongs to a position the screen has not reached. Five tests pin it.
+
+### The name on the Division map is readable again (Gitea#24)
+
+*"When it shows your player, the font is unreadable... the bold font makes it look fuzzy, and the letters
+blur together."*
+
+A name takes the class `bs-turn` while it is that player's move — and `.bs-turn` is also the Division
+map's turn ARROW, which strokes its shape 2.4px grey with no fill. The name's own rule changed only the
+fill, so every letter was outlined in grey. It showed for the viewing player almost constantly because of
+Gitea#25: the map believed it was nearly always their move. `.bs-name` now sets `stroke:none`.
+
+---
+
+## 0.8.0.9 — 2026-09-15
+
+**The developer bot, re-measured decision by decision — and an engine 2.8× faster.** Across the changes
+adopted below, each paired against the bot before it, the bot went from about −0.3 revenue a game to
+about 4.8: the switching planner +2.89, taking a face-up card only if it could be played +1.52, the
+deliberate New Train fallback +0.32, and laying track by what the district can do afterwards +0.12.
+
+### Games in progress
+
+**Resume.** No rule changed, and no legality check changes its answer. The engine's speed-ups were proven
+to leave play identical — every event and intent of 32 seeded games hashed before and after each step —
+and `test/route-cache.test.ts` pins the new check/commit split. Only the developer bot plays differently,
+and a bot's past moves are already in the save.
+
+### The bot plans its switching turn instead of choosing one Move at a time
+
+The switching branch was a ladder of rules picking ONE Move, and its own comment named the gap: "a
+strong player would use the six Moves to re-order the consist — that is the game's central switching
+puzzle, and this bot does not attempt it." `sim/switch-planner.ts` attempts it, for one turn.
+
+**Why search is fair.** A switching turn draws no card and rolls no die, so trying sequences on a copy
+of the game is what a player does by looking at the board. The score reads only what a player can see
+— the district, the cars on the trains, the facilities — and never the deck. Jesse's line
+(2026-09-14): no non-player advantage for the bot.
+
+**Why not every sequence.** Measured over 30 switching turns from bot games: a median turn reaches
+229 distinct positions, but 11 of 30 passed 20,000, because **setting cars out costs no Move** and a
+crew can leave them in a great many places. So the search keeps the best 48 positions at each step
+and stops at 3,000 tried; small turns are searched completely inside that.
+
+**The score is of where the turn ends**, starting from Jesse's ruling that players deliver and pick up
+cars even when it delays trains. A car an industry can work is +1 (+0.25 past its box count); a car it
+cannot is −0.5 on its track; a finished car left on it −0.15; a wanted car aboard +0.35 or staged on
+plain track +0.2; a coach kept with its train +0.3, stranded −0.3; anything fouling the Office −3; a
+train away from the Office −0.25, −1 more if expedited; a train §8.2 would refuse (`badlyMadeUp`, now
+exported rather than copied) −0.6. A load made in this district scores nothing at a receiver here.
+
+**The copy is partial.** `forkForSwitching` copies only the arrays a switching intent writes — cars
+standing on cards, industry tracks, the district's A/D and held lists, the trays' consists, this turn
+and the tally — and shares everything else. It began as a `structuredClone` of the district, which a
+profile put at **44% of all planning time**; the targeted copy made a position about three times
+cheaper to try. `test/switch-planner.test.ts`
+proves across seeded games that planning leaves the real game byte-identical, and that every plan
+replays through `applyIntent` on a FULL copy to the exact position it promised.
+
+**Measured, 1600 paired seeds: +2.89 ± 0.18 revenue a game (t = 15.79)**, 733 seeds better, 21 worse.
+
+| | rules | planner |
+| --- | --- | --- |
+| revenue | −0.05 | 2.83 |
+| freight loads + unloads | 0.22 | 1.53 |
+| collisions | 0.12 | 0.12 |
+| Cargo phases with a car spotted | 5% | 18% |
+| … with green box, car and Laborer at one industry | 3% | 11% |
+
+**Split by source over 400 seeds**, because the biggest wins were rescues: freight **+1.21** (t = 13.9),
+passengers +0.26, expedite faults **+1.07** (19 of 400 games faulted under the rules, none under the
+planner — TODO #53, closed by this), collisions unchanged. **Without the fault rescue it is still
++1.45 ± 0.12 (t = 12.2)** — the switching itself got better, not just the catastrophes rarer. It also
+sets out half as many cars (3.6 against 7.0): the ladder was setting cars down and picking them up.
+
+**The worst seeds, traced.** Two of the three lost to "no free A/D track" collisions with both tracks
+already held by trains standing at the Office — not trains left away, which is what the score's
+`trainAway` weight would have explained. The third never had a coach train at the Office in a
+Load/Unload phase at all: a different switching turn draws different cards, and the game diverges.
+Neither is a scoring defect found; the full-Office collisions are worth watching.
+
+**How far to search.** The search size was measured rather than guessed, paired over 400 seeds against
+the 3000-position, beam-48 search the gain above was measured with:
+
+| budget / beam | revenue against 3000/48 | median / worst per turn |
+| --- | --- | --- |
+| 3000 / 48 | — | 150 ms / 445 ms |
+| **2000 / 32 (adopted)** | −0.02 ± 0.01 (t = −1.68), inside the noise | **69 ms / 222 ms** |
+| 1000 / 24 | −0.06 ± 0.02 (t = −2.65) | 53 ms / 104 ms |
+
+Times are from 51 switching turns with other simulations sharing the CPU, so read them as relative.
+
+**A switching-only legal list.** `legal.ts` now exports `legalSwitchingActions`, the switching half of
+the Local Operations candidates run through the same `check`, in the same order — so the planner stops
+paying for every draw and Freight Agent candidate at each position it tries. A test asserts it equals
+`legalActions`' switching subset across real games. It contains no rule; `check` still decides.
+
+**Nothing the simulation tests measure moved backwards.** `sim.test.ts` passes all 35 tests with the
+planner as the default, floors unchanged.
+
+**Cost.** A turn is planned once and then played a step per decision, replanned if the position is
+ever not the one expected. At a live table that is a synchronous pause inside `driveBots`, well inside
+Jesse's bar of half a second before a switch.
+
+**The price is test time.** A standard solitaire game takes ~400 ms with the planner against ~108 ms
+without, and `npm test` — which plays well over a thousand bot games in `sim.test.ts` — went from about
+150 s to **8 min 6 s** (992 of 992 passing, measured with nothing else running). What is left of a
+planned turn's time is the engine itself: applying a move is about half of it and `check` a third.
+
+**And the take rule tripled it again.** With both defaults in, `npm test` passes 992 of 992 in
+**21 min 21 s** with nothing else running — the bigger districts the take rule builds (14 → 24 cards,
+29 cards played a game) make every game longer to play and every switching turn wider to search.
+
+`noPlanSwitching=1` is the ablation.
+
+### Track goes where it lets the district do something
+
+Jesse's third area, after switching and industries: track for the run-around. With the draw no longer
+wasted, ~13 of ~16 pieces a game were still being laid by the draw turn's fallback at the first legal
+square, and both fixes to that fallback failed (holding −0.83, `bestTrackLay`'s own score +0.07). So the
+limit was the scoring: `bestTrackLay` scores the PIECE, and cannot tell one that opens an industry site
+or closes a run-around from one that fills a square.
+
+`bestValuedLay` scores the LAYOUT the piece would leave instead. Each legal lay is placed on a copy of
+the district exactly as the reducer places it — `protoCard` and `extendLimitsIfNeeded`, now exported
+rather than copied — and worth the change it makes to `layoutValue`: industry sites a crew can reach
+(`canPlaceAt`), a closed run-around (the bot's own `descendFrom` walk), ways off the main and reachable
+siding, a Running Track straight for Interlocking, and a penalty for a turnout on the main whose leg
+joins nothing. `bestTrackLay`'s slot takes the best lay that gains something; the fallback still lays as
+often as before — holding starved the district — but the best lay rather than the first.
+
+**+0.118 ± 0.029 revenue a game (t = 4.14) over 6400 paired seeds**, 1,667 better against 1,430 worse.
+It needed that many: 400 seeds read +0.17 (t = 1.48) and 1600 read +0.14 (t = 2.58). What it builds is
+the larger change — **closed run-arounds in 22 of 60 districts against 9**, industries 1.78 → 1.87, freight
+2.54 → 2.65, collisions unchanged, the district 24.2 → 21.9 cards because squares stop being filled with
+pieces that build nothing. No slower: a standard game measured faster, the smaller districts leaving
+less to search. `noValueLays=1` is the ablation.
+
+**Why so many run-arounds buy so little.** Traced over 40 games: the planner uses the loop — a move ends
+on it in 63 of 131 plans where one exists, 35 run it both ways — but its planned gain per turn is the
+same with a run-around as without (0.28 against 0.27). A run-around is for putting a train's cars in a
+different order, which pays off in the turns AFTER; a one-turn planner cannot value it. That is TODO #105.
+
+**How 6400 seeds were measured.** `compare.ts` keeps every game's full statistics for both sides, and the
+run was stopped for low memory — as was a first lean attempt, by the machine's background-task guard
+rather than by the process: a probe showed no leak (heap flat at 9 MB after GC across 300 paired games).
+The figure above comes from a paired script with the same seeds and configuration that keeps only each
+seed's revenue difference, run in resumable foreground chunks; its first 1600 seeds read +0.143, matching
+`compare.ts`'s +0.14.
+
+### The engine walks each position's routes once — 2.8× faster, every game identical
+
+Jesse's call (2026-09-15): speed up the engine's move checking and applying first, because the live
+server runs the same `legalActions` and `applyIntent` for every bot and every player. A CPU profile
+with inlining off put the route walk (`reachableDestinations`) at a third of all time and garbage
+collection at another third, and most of the walking was repeated work.
+
+- **A route cache scoped to one unchanged position** (`withRouteCache`, `apply.ts`). `legal.ts` walked a
+  tray's routes to list its moves, `check` walked them again for every one of those moves, and
+  `execute` walked the chosen move a third time. Now a legal-action listing, and the check-and-execute
+  of one intent, walk each route once. The cache is keyed to the state object and the walk's inputs
+  and dropped before `reduce` changes anything, so a hit is exactly what a fresh walk returns.
+- **`applyIntent` = `prepareIntent` + `commitEvents`.** The planner decides every candidate against one
+  position inside one cache and commits each to its own copy; deciding on the copy had re-walked every
+  route the listing had just walked.
+- **Less garbage in the walk itself** (`exploreMoves`): the blocked-square explanations are not built
+  when only destinations are wanted, the queue is read by index instead of `shift()`, and "has this route
+  been here" reads the route's own path instead of copying a Set at every step.
+
+**A standard solitaire bot game, 561 ms → 203 ms; a short one, 141 ms → 65 ms.** Proved identical by
+hashing every event and intent of 32 seeded games (20 solo standard, 6 three-player standard, 6
+two-player short) before and after each change, and pinned by `test/route-cache.test.ts`, which checks
+at every decision of a seeded game that `prepareIntent` writes nothing and that committing its events
+to a copy equals `applyIntent` in place.
+
+### The test suite is split
+
+Jesse (2026-09-15): `npm test` runs after every change, so it has to stay fast; reducing the simulations'
+game counts is not acceptable. `npm test` now runs every file except `test/sim.test.ts`, and
+`npm run test:sim` runs the bot simulations on their own, typechecked first.
+
+**Measured with nothing else running, after the engine speed-up: `npm test` 958 of 958 in 1 min 45 s;
+`npm run test:sim` 35 of 35 in 6 min 58 s** — against 21 min 21 s for the two together before it.
+
+### Where industries go was not the problem — there was nowhere, and the draw was going in circles
+
+The next thing Jesse named after switching was where industries and enhancements go, then track for the
+run-around. Measured before touching either, 30 standard games, and it turned both round:
+
+- **The bot places an industry every time it legally can.** It held an industry card at 1,441 draw
+  decisions and a legal square existed at 24 of them (2%); it played the industry at all 24 and never
+  discarded one that had somewhere to go. 0.70 industries stand on a board at game end.
+- **Why there was nowhere.** An industry is a plain east-west piece that must join existing track and
+  may not sit on the Running Track. Asked of `check` square by square, the closest a held card got was
+  NOT_CONNECTED 1,681 times, OUTSIDE_LIMITS 398, legal 28 — never locked out. Printed districts show why:
+  the row beside the main fills with 45° curves and turnouts whose east-west ends face occupied squares.
+- **And track was not the lever either — its supply was.** At 1,334 decisions holding an industry with
+  no site, a track lay was legal at only 54; a lay that would open a site existed at 22 and the bot
+  already chose one at 17. The hand had no track in it.
+- **Because the draw was cycling.** The bot took 20.1 timetabled trains and 11.9 industries a game off
+  the Departments and discarded 20.2 and 11.8: `takingRank` ranked a face-up train 2 whether or not the
+  A/D cap would let it be played, and a face-up industry 1 whether or not it had a site (one did at 0.17
+  of those takes). The same card was taken again 28.8 times a game, against 19.6 blind draws.
+
+### The bot takes a face-up card only if it could play it
+
+`takingRank` now ranks a face-up train card 0 when the A/D cap would hold it, and a face-up industry 0
+when it is locked out or has no legal site — both asked of the rules the play itself is checked by
+(`trainWouldOverfillTheOffice`, and `isLockedOut` with `canPlaceAt` in `industrySiteExists`). Nothing
+here is hidden information: the Departments are face up.
+
+**+1.52 ± 0.10 revenue a game (t = 15.59)** over 1600 paired seeds, measured as the ablation
+`noPlayableTakes=1` against the new default: 880 seeds worse without it, 211 better. (The first
+400-seed read was +1.63 ± 0.19.) Cards played 15.8 → 29.0 a game and the district grows 14.2 → 24.2
+cards, because the draws it stopped wasting now bring in track: trains scheduled 1.74 → 2.30, freight
+1.51 → 2.54, passengers 1.89 → 2.94. **Collisions rose, 0.12 → 0.24**, with the extra trains — see
+TODO #106.
+
+### Rejected: holding track the run-around scoring declined
+
+Traced first: of ~16.4 track pieces a standard game lays, only ~3.3 came from `bestTrackLay`. The
+draw turn's "play what is in hand" fallback laid the other ~13 at the FIRST legal square — pieces
+`bestTrackLay` had just declined, including 4.0 turnouts and 4.3 straights a game on the main and 1.5
+turnouts a row off it. The candidate let the fallback lay track only when nothing else could bring the
+hand under the limit. **−0.83 ± 0.16 (t = −5.17)**, 172 worse against 90 better: the district fell
+24.1 → 11.7 cards and freight 2.41 → 1.77. `bestTrackLay` declines most pieces, so holding them
+starves the district — #59's finding, again, with a fuller hand to hold them in.
+
+### Rejected: laying fallback track where it scores best instead of first
+
+The other half of the same trace: keep laying the ~13 fallback pieces a game, but at `bestTrackLay`'s
+best-scoring square (bonus or not) rather than the first legal one. **+0.07 ± 0.13 (t = 0.60), inside
+the noise**; freight 2.41 → 2.56 but the district 24.1 → 21.0 cards. With both halves measured, the
+limit is `bestTrackLay`'s SCORING — it cannot tell a piece that opens an industry site or advances a
+run-around from one that fills a square — not which branch places the piece. Code removed.
+
+### The bot stops running Second Sections by accident
+
+TODO #106 traced under today's defaults: of 20 "no free A/D track" collisions in 60 standard games, no
+train had been held before any of them and only 8 of the destroyed were Extras. Six destroyed a train of
+the same number as a Second Section run within two Stages, and **all 26 Second Sections the bot ran were
+an accident**: when no car was on offer, the New Train phase fell back to `options[0]`, and `legalActions`
+lists `newTrain.secondSection` ahead of the Extra starts — so a waiting Extra became a doubled train due
+out, into an Office that never had an A/D track to spare. The fallback now takes a car, a pass or the
+Extra's start, and never a Second Section or a Red Flag merely because it was listed first.
+
+**+0.32 ± 0.09 revenue a game (t = 3.64)** over 400 paired seeds, 30 better against 12 worse; collisions
+0.24 → 0.19. `noDeliberateNewTrain=1` is the ablation.
+
+**Found on the way, for Jesse — a rules question, not changed.** Q9 defines the Second Section as a card
+played on a train due out and `content.ts` gives `SECOND_SECTION` one copy, but `buildDeck` never deals it
+and `check` asks for no card, so any player can run one for free on every train due out.
+
+### Rejected: planning two switching turns ahead (TODO #105)
+
+Built as `planTwoTurns`: keep the six best ends of a switching turn, remove the trains that highball in
+the Mainline Phase in between (on the Office square and made up — their cars leave with them), reset the
+Moves, plan the next turn from each, and choose by the position after departures plus 0.8 of what the
+next turn adds. **−0.28 ± 0.11 (t = −2.58)**; corrected to charge the expedite fault the gap cannot undo
+and a Stage for every train left away, **−0.14 ± 0.06 (t = −2.36)** — 400 paired seeds each. A second turn
+has little to find: only 49% of switching turns keep their train for the next, a further turn could have
+spotted just 0.7 of the 6.1 wanted cars a game that leave aboard departing trains, and trains left away
+cost Stages walking crews home. Dropped at Jesse's call; the measurements are in TODO #105.
+
+### Rejected: starting an Extra the Office cannot take where its run never arrives
+
+TODO #106, re-measured under today's defaults: 20 collisions in 60 standard games (−1.67 revenue a
+game), every one "no free A/D track", and 26 Extras forced out by a full hand of them. The bot also took
+the first legal start for EVERY Extra — the western Division Point, 158 of 158 — so the candidate chose,
+when the committed trains exceeded the A/D tracks, a start whose run never reaches the Office: an Extra
+runs away from its start (`resolveExtraStart`), and at the Interchange one way may miss the Office.
+**+0.10 ± 0.05 (t = 1.82), 395 of 400 seeds identical**: such a start was on offer at 1 of 25 over-cap
+starts — most Divisions have no Interchange, and a Division Point always runs through the Office. Code
+removed.
+
+### Rejected: refusing to draw into a forced Extra
+
+With the take rule in, the bot's worst seeds all lost to "no free A/D track". Traced: every one of 23
+train plays past the A/D cap in 40 games was an EXTRA, played because the hand held four of them and
+the only legal action was `card.play` — §6.2 makes a player over the limit reduce the hand, and an Extra
+may never be discarded (`keepReason`), so the cap in `choose` yields rather than leave nothing legal.
+The candidate declined to choose the draw option with a full hand of such cards when switching or the
+Freight Agent was on offer. **−0.03 ± 0.11 (t = −0.30), inside the noise**: collisions fell
+0.26 → 0.20, and development fell with them (cards played 29.0 → 25.6) — the Stage spent avoiding the
+draw was a Stage not spent building. Code removed; the trap itself is real and filed.
+
+### Rejected: discarding the card least likely to become playable
+
+When a discard was forced, the candidate picked WHICH card by a keep-value (next Office tier, then
+Enhancements, track, trains, and industries with no site or Modifiers with no industry last), weighted
+so no pile preference could overturn it. **−1.16 ± 0.12 (t = −9.27)**, 16 better against 119 worse,
+cards played 15.7 → 10.4. Not traced; the likeliest reason is that the weight overrode `bestDiscard`'s
+pile choice, which exists to avoid burying a face-up card the bot wants. Code removed.
+
+### Flying Switch is searched, and cannot be measured
+
+The planner now considers Flying Switch alongside Moves, set-outs and sorts — its partial copy of the
+game carries the hand and the Salvage Yard, which `spendCard` writes, and spending the card costs a
+tenth of a point so it is played only when it buys something. **Over 400 paired seeds it changed
+nothing, because the card is dealt 0 copies** (not in sheet 5; Jesse, 2026-08-26): across 30 standard
+games no Flying Switch was ever drawn. TODO #58's "never fires" is therefore a deck fact, not a bot
+one. On by default, so the planner uses the card the day it is dealt again.
+
+### Rejected: letting the planned gain decide whether to switch at all
+
+Whether a Stage goes to switching is decided by `usefulSwitching`, a yes/no reading of the district.
+The candidate replaced it with the planner's own answer — plan the turn on a fork before the option is
+chosen, and switch only if it gains at least a threshold. Paired over 400 seeds against the planner:
+
+| threshold | revenue | seeds better / worse / identical |
+| --- | --- | --- |
+| 0.5 | **−0.33 ± 0.06 (t = −5.06)** | 15 / 70 / 315 |
+| 0.25 | −0.01 ± 0.05 (t = −0.21) | 21 / 22 / 357 |
+| 0.1 | +0.06 ± 0.03 (t = 1.79) | 20 / 13 / 367 |
+
+At 0.5 it refuses turns that only COLLECT — a wanted car picked up scores +0.35 — and those pickups feed
+the deliveries after them. Below that it agrees with `usefulSwitching` almost everywhere, because that
+rule already says yes exactly when there is a car to deliver or lift, which is when a plan gains. The
+decision that would matter is switching against DRAWING or the Freight Agent, and the bot has no value
+for either to compare with; that is the next piece of work, not a threshold. It also cost a full
+search at nearly every Local Operations decision. Code removed.
+
+### Rejected: discounting a car its industry cannot work yet
+
+A spotted car scored half when its shipper had no load staged or its receiver's red box was full.
+**−0.29 ± 0.05 (t = −5.52)** over 400 seeds, 47 worse against 4 better; green boxes stocked fell
+15% → 11% of Cargo phases. The reason is the order the bot works in: the Freight Agent stocks a box
+only once a car is spotted to receive it (`canStockProductively`), so an industry is "not ready"
+precisely because nothing has been delivered — the discount withheld the delivery that makes it ready.
+Code removed.
+
+---
+
+## 0.8.0.8 — 2026-09-10
+
+**A played train does not come back. Gitea#23, ruled and closed.**
+
+Jesse, on the question v0.8.0.7 filed rather than answered: *"Once you've played a regularly
+scheduled train and it's in the salvage deck, that train is already on the timetable. It does not
+make sense to put that back into a reshuffled home deck to get played again. By contrast, a regularly
+scheduled train that's in a discard pile could potentially get reused later, and so should have that
+capability. Extras run one time and then they're done — if they are in the Salvage deck, they should
+get shuffled back in so that they could get run again."*
+
+**The test is WHERE the card is, not only what it is** — which is the part worth writing down, because
+it is exactly the rule a later tidy-up would "simplify" into filtering by card kind everywhere. The
+same train card is spent in the Salvage Yard and still runnable in a Department:
+
+| card | where | on a reshuffle |
+| --- | --- | --- |
+| timetabled train | Salvage Yard — it was **played**, its number is on the timetable | stays out |
+| timetabled train | a Department — **discarded**, never played, slot still open | comes back |
+| Extra | anywhere | comes back; an Extra is one run, not a standing slot |
+| everything else | anywhere | comes back, as before |
+
+### And the duplicate that started it
+
+`trainScheduled` was pushing a synthetic `train-<number>` into the Salvage Yard **beside the real
+card `cardPlayed` had already put there** — measured: four scheduled trains left eight entries in a
+pile holding four cards. Nothing read that id. It inflated the pile's depth, displayed as "a card"
+because no such card exists, and would have been swept into the draw deck to be drawn as an id with
+nothing behind it. Removed, which retires the whole phantom-id class rather than papering over it —
+so v0.8.0.7's `cardName()` resolver for `train-<n>` is gone too, along with its test. Dead code kept
+for an id that can no longer exist is worse than no code.
+
+### Games in progress
+
+**Resume.** No predicate changed its answer — nothing that was legal became illegal, and a draw is a
+draw whatever is on top of the deck. What differs is the Salvage Yard's depth, which was
+double-counting, and what a reshuffle would recover. Reshuffles are effectively unreachable in
+ordinary play: eight games driven to 4000 moves across eight seeds produced zero.
+
+Closes #23.
+
+---
+
+## 0.8.0.7 — 2026-09-10
+
+### The Salvage Yard was face up and had nothing to say
+
+*"Why is salvage deck not face up? I should see the card played onto salvage."* It always was — the
+tile reads the top card. It just said **"a card"**.
+
+`apply.ts` pushes a **synthetic id** on `trainScheduled`:
+
+```ts
+s.decks.salvageYard.push(`train-${e.trainNumber}`);
+```
+
+Nothing in `s.cards` matches that, so `cardName()` fell through to its "a card" default — and since a
+train is scheduled several times a Day, that id is on top of the pile most of the time. Measured
+before touching anything: a session's Salvage tile read `"a card"` from the opening frame through 60
+pushes, never once changing, while its depth climbed from 2 to 8.
+
+`cardName()` resolves `train-<n>` now, so the tile reads **Train 3**, **Train 2** as cards land.
+Resolved in `sim/view.ts` because this is a NAME, which is that file's job.
+
+**The engine half is filed, not fixed — Gitea#23.** `reshuffleIfDepleted()` sweeps the Salvage Yard
+back into the draw deck, so a synthetic id can be shuffled in and drawn into a hand as an id with no
+card behind it. Not reachable in ordinary play: eight games driven to 4000 moves across eight seeds
+produced **zero** reshuffles. There are two defensible fixes and the choice turns on what that
+synthetic id is *for*, which is not a call to make in passing while fixing a label.
+
+### Phases scale with the speed control again — at a third of the rate
+
+*"Phases displayed on the upper line go by too quickly still. Should be 4 times as long — at a guess.
+Maybe use the speed multiplier for that too?"*
+
+Two complaints from opposite directions, and the answer is between them. v0.8.0.3 **pinned** phases at
+their tabled beat because scaling them walled off a player's own turn — *"that makes no sense"*. At
+10× that pinned beat is too short to read the sentence on it.
+
+So they scale, damped to a third of the rate: **1× unchanged, 10× lands exactly on the four-times
+guess**, 20× gives 4400ms. The cost stays bounded because phase beats cluster rather than accumulate
+— measured over 60 pushes, a push carries **1.0 phase beat on average and 4 at worst**, so the wait
+after a move is ~2.4s typical and ~10s at its very worst, against the minutes a full multiplier would
+have cost. A player's own move still outlasts a phase beat at every speed, which is the ordering that
+matters.
+
+---
+
+## 0.8.0.6 — 2026-09-10
+
+Playing v0.8.0.5: *"saw bot's office area now — much better."* Three things still wrong, and one of
+them was mine hiding inside the fix for another.
+
+### Your move is put away while the board is catching up
+
+*"Your actions should be hidden while catching up."* Two reasons, and the second is the one that
+changed my mind about a decision taken early in v0.8.0 ("never block input"). The board on screen is
+behind the game, so a move offered there is a move against a position that has already moved on — the
+menu is computed from the CURRENT state and would be acted on while looking at an older one. And the
+screen had grown to four things competing at once: the district, the history, the catching-up row,
+and now a lit pile. Taking the action list out of that competition, while there is nothing to decide
+anyway, is the cheapest way to quieten it.
+
+Not a block: Skip is one click away at the left of the row, so the wait stays voluntary. The buttons
+are replaced by the reason they are gone.
+
+### …which could have locked a player out of their own game
+
+Hiding actions behind `busy()` makes that flag the thing standing between a player and their turn —
+and **without `requestAnimationFrame` nothing ever advances the queue, so `busy()` would never
+clear.** The action list would have been hidden permanently, with Skip the only way to play.
+
+Caught by `test/web.test.ts`, whose DOM stub has no `rAF` — the same stub that has been proving this
+page still starts since long before any of this existed. Two fallbacks now: no `rAF` means draw
+everything at once (exactly what `pace = 0` does deliberately), and a queue that throws empties
+itself rather than stranding the player. `test/step-queue.test.ts` pins that a never-advanced queue
+is still skippable.
+
+### The lit pile was never brief — it was too quiet
+
+*"Never saw decks lighting up… caught one flash deck light up for just a very brief moment, but
+couldn't see that with what bot was doing in office area and history and catch up area all at same
+time."*
+
+Measured before changing anything: at 10× a pile stays lit for **6997ms**, just under seven seconds.
+So the highlight was not brief at all. It was a single 0.45s flash-in over a dark green fill, easy to
+miss entirely while looking at the district — a state that settles stops asking to be looked at. It
+pulses now for as long as the move is up, with a ring and a glow. The reduced-motion fallback is loud
+in a different way rather than simply still, since motion is the whole point here.
+
+### The ceiling was not theoretical
+
+*"At 10× — still a bit fast, but followable."* 10× was the top of the ladder, so the control's
+slowest setting was not slow enough for the person using it. `PACE_LEVELS` now runs to 20 and
+`MAX_PACE` with it. A control whose limit is reached in ordinary use has the wrong limit, not the
+right one held firmly.
+
+---
+
+## 0.8.0.5 — 2026-09-10
+
+**Somewhere to look.** Jesse, playing v0.8.0.4 at 10×: *"many operations still occurred too fast for
+me to see."* At 10× an action holds the screen for seven seconds, so this was never about duration —
+it was that a bot drawing a card changes one number in a panel nobody is watching, and the board sits
+unchanged for those seven seconds. **Raising the dwell was the wrong lever, and it had been pulled
+three times.** His diagnosis was the right one: mark WHERE, not longer.
+
+### The Home Office deck was never drawn
+
+`f.deck` has carried the face-down count since the Frame existed and **nothing in `src/web/` read
+it** — the exact display gap `test/display-gaps.test.ts` was written to sweep for, surviving in the
+one panel that draws every other pile. It is a tile now, first in the row, because that is the order
+a card travels: out of the deck, into a hand, then onto a Department or the Salvage Yard. Face down,
+so its card slot says so rather than naming one — not knowing what is on top is the point of the
+pile.
+
+### What lights, and why that is exactly what is public
+
+The piles a move touched are now lit for as long as that move is on screen. **Derived, never sent**:
+the client already holds the frame before a step and the frame after it, so `changedPiles()` is a
+diff. Nothing is added to the protocol, nothing can drift out of step with the projection, and the
+0.8.1 seatless board gets it for free.
+
+Measured across four seeds rather than reasoned about, and pinned by a test that requires each case
+to have actually occurred rather than passing on whichever the bot happened to play:
+
+| action | lights | why that is public |
+| --- | --- | --- |
+| `draw.fromHomeOffice` | the deck | the count, never the card — a blind draw stays the drawer's |
+| `draw.fromDepartment` | that Department, and the deck when it refills | the pile is face up, so the card taken is public |
+| `card.discard` | that Department | face up, and which pile it went on is the point |
+| `card.play` | the Salvage Yard | where a played card that did not stay on the board lands |
+| switching, new trains | nothing here | they move the board, which the district panel already follows |
+| `*.end`, `localOps.choose` | nothing | no card moved |
+
+**It is a state, not a flash**, and that distinction is the whole reason it works. The timetable's
+existing `.tt-slot.fresh` animates for a fixed 1.5s — right for a die roll nobody is waiting on, and
+wrong here, because a step can hold for seven seconds and the animation would be long over before
+the pause it belongs to. A brief flash-in marks the moment; the lit border and background stay for
+exactly as long as the step is up.
+
+**Not for your own moves.** You drew that card — the same rule that already gives your own steps no
+dwell.
+
+---
+
+## 0.8.0.4 — 2026-09-09
+
+**Housekeeping: the test server's name is out of the ten places this session put it.**
+
+Both of this project's repositories allow anonymous clone — checked, not assumed: `info/refs` for
+`git-upload-pack` answers 200 for `station-master` and for `station-master-startos` alike, while
+`git-receive-pack` answers 401. So everything committed here is public, and the standing rule is that
+tracked files carry placeholders rather than real hosts.
+
+Ten mentions added while building v0.8.0 are now "the test server" or "the target hardware":
+`CHANGELOG.md`, `docs/plans/jitsi-common-board.md` (three identical deferral banners), `sim/pacing.ts`,
+`test/pacing.test.ts` and `test/step-queue.test.ts`. Prose and comments only — no behaviour, and the
+quotes they carry are unchanged, because what a player said about bot pacing is the part worth
+keeping.
+
+**What is deliberately left, and why it is not an oversight:**
+
+- **Nineteen older mentions**, in entries about v0.7.5, v0.7.6 and v0.7.8 and in `TODO.md`. Rewriting
+  a changelog after the fact makes the record less true, and these describe verification that
+  genuinely happened on that machine.
+- **`scripts/deploy-web.ts` is FUNCTIONAL, not prose.** It carries the host as the default for
+  `FB_URL`, so a placeholder there would break the deploy for the person the default exists to serve.
+  Same for the public address it publishes to. If those should move to required environment variables
+  with no default, that is a change to how deploying works and wants deciding on its own rather than
+  being smuggled in beside a comment sweep.
+
+---
+
+## 0.8.0.3 — 2026-09-09
+
+Three things from playing v0.8.0.2, all of them about the row rather than the mechanism.
+
+### Skip was at the wrong end of the row
+
+Jesse: *"the skip button should be on the far left, in front of where it says [the count], so it's
+always close to where people are looking."* It was on the far right, and a player's eye is on the
+countdown. Moved.
+
+### The caption said what, but never who
+
+*"I saw 2 behind, 1 behind, and then it was caught up, but it didn't tell me what the actual action
+was, like who I was waiting on or what they were doing. I knew I was behind, but I wasn't sure what I
+was supposed to be looking for."*
+
+The caption was there. It was the wrong half of the sentence. **Measured over 40 turns of a real
+3-seat game, half the waiting is automatic phases** — 21.0s of phases against 21.7s of other players —
+and a phase narrates as "Mainline", which is accurate and no answer at all to "who am I waiting on".
+A phase now introduces itself: **"The Division: ▸ Mainline phase"**. A player's move already carries
+its name from `record()`, so it is left alone rather than stuttering it twice.
+
+**And the row was hiding a step early.** It was shown only while `behind > 0` — which goes false the
+moment the LAST step of a burst goes up, so the one step a player was most likely to be reading about
+lost its caption. It now stays up while the queue is still showing something, and reads "catching up"
+once nothing is queued behind.
+
+### The speed control was stretching the clock, not just the other players
+
+*"After my turn, when I actually execute my turn, I'm still subject to that same delay before it
+moves on. That makes no sense. Since I've just done my turn, I don't need to wait after it."*
+
+He was right, and it was not his move being replayed — own moves have cost nothing since v0.8.0.1. It
+was the automatic phases behind it, which were scaling with `pace` along with everything else. At 5×
+that put **105 seconds of clock-ticking** into the game, all of it after a player's own move and none
+of it anything to watch.
+
+**`pace` now scales a player's move and leaves a phase at its tabled beat.** The control is labelled
+as how long another player's move is held, and that is now what it does. A phase still gets its beat
+(TODO #18) and still vanishes entirely at `pace = 0`, because off has to mean off.
+
+---
+
+## 0.8.0.2 — 2026-09-09
+
+Two things found by playing v0.8.0.1 on the test server, neither of them in the mechanism itself.
+
+### `?pace=` never worked, and a whole game was played at the wrong speed
+
+Jesse: *"I'm playing at pace = 7, and the bots are still moving too fast for me to follow."* At 7×
+a switching move holds for seven seconds, so that could not be calibration — and it was not. **He was
+at 1× the entire time.**
+
+`index.html`'s two doors are `./play.html?lobby` and `./play.html?solitaire`. Arriving through the
+splash therefore **replaces** the query string, and `location.search` on the play page is `?lobby` —
+so `PACE_OVERRIDE` was null and it fell back to the stored setting of 1. v0.8.0 shipped `?pace=` as
+the only way to change speed and the game's own front door destroyed it. Verified rather than
+assumed: the queue at pace 7 holds a bot's turn for 32.9s with the bot's district up for 24.5s, so
+the mechanism was right and the value never arrived.
+
+Fixed twice over, because one of them is the durable answer:
+
+- **A speed control on the play screen**, beside zoom — `− 1× +`, persisted per viewer, reading
+  through to the queue on the very next move. `PACE_LEVELS` is `0, 0.5, 1, 2, 3, 5, 7, 10`: off is
+  the first rung (TODO #18's "a player who has seen it a hundred times will want it off") and the
+  ladder reaches the speeds people actually reach for. At the top, a six-move switching turn takes a
+  full minute to watch.
+- **The doors now carry `pace` through**, so the URL lever is honest for handing two playtesters
+  different speeds — the only thing it was ever for. When one is present the control says
+  `7× (URL)` and disables itself rather than showing buttons that do nothing.
+
+`PACE_LEVELS` lives in `sim/pacing.ts` with `DWELL` and `MAX_PACE`, not in `main.ts` — the whole
+tuning surface in one file, and testable, which a constant inside the page entry point is not.
+
+**The committed default is unchanged at 1×.** What it should be is a question for a game played at a
+speed that actually took effect.
+
+### "0 today, 2 in all" — the Day-end dialog contradicted itself Jesse, at the end of a Day 1 with
+two collisions in it: *"It shows a total of two collisions, but zero today. Since we just finished day
+one, that does seem to be a contradiction."* Unrelated to v0.8.0 — this has been wrong since the
+dialog was built for Gitea#10, and nobody had played a Day with a collision in it and then read the
+summary.
+
+#### One line of ordering
+
+`advance.ts`, at the rollover:
+
+```ts
+s.clock.day += 1;
+s.collisionsToday = 0;
+```
+
+And `noteDayEnd()` fires when `f.day` goes UP — so the dialog reporting the Day that just finished is
+drawn from the very frame in which that Day's count was zeroed. It printed the *new* Day's zero beside
+a running total that could not possibly agree with it. Reproduced on four of five seeds before
+touching anything: Day 1 ended with `today=3 total=3`, and the dialog read `today=0 total=3`.
+
+**Not derivable on the client, which is why the fix is in the engine.** A Day turns over inside the
+phases that run themselves, so in multiplayer the push announcing the new Day is the same push that
+carries the reset — a client may never see the ended Day's final count to remember it. So
+`collisionsPrevDay` is captured in state at the rollover, immediately before the reset, and rides on
+the frame like the other two counts.
+
+#### And "today" was the wrong word anyway
+
+Even with the right number, a dialog headed "Day 1 has ended" should not say "today" — by then
+"today" is Day 2. It now names the Day: **"Collisions: 2 on Day 1, 2 in all."** The end-of-game
+results screen passes no Day and keeps "today", where the Day has not turned over and the word is
+accurate.
+
+`test/redaction.test.ts`'s allow-list did its job on the way through: adding a public property failed
+the suite until it was declared out loud.
+
+---
+
 ## 0.8.0.1 — 2026-09-09
 
-**Bot play was way too fast.** v0.8.0 was installed on `phoenix.local` and played within the hour;
+**Bot play was way too fast.** v0.8.0 was installed on the test server and played within the hour;
 Jesse: *"I briefly saw that it was the bot's office area then their turn was done and it pointed back
 to my office area"*, and the countdown row appeared "very briefly". Everything else looked right —
 the bots were visibly doing things — so this is calibration and one real bug, not a redesign.

README.md

@@ -56,7 +56,8 @@ deliberately no longer names one: it went stale for six releases.
 Balance is *not* where it should be, and this file no longer quotes a figure for it. It used to say
 "the developer bot averages 7.0 Revenue against a target of 20", which stopped being true the moment
 the transit rule it names was defaulted to off — that rule was worth ~5.4 of the 7.0, for traffic
-nobody had to work. Measured at the current defaults the bot means about **zero**.
+nobody had to work. Measured at the current defaults the bot meant about **zero** until it began
+planning its switching turns (2026-09-14), which put it near **2.8**.
 
 The three rates — passenger per coach, freight per load, train per transit — are **settings fixed when
 the game is dealt**, along with the opening hand and where an Extra may start, so the economy can be
@@ -102,7 +103,8 @@ separate thing: it assembles the static SITE into `dist/`.)
 
 ```sh
 npm install
-npm test          # node --test
+npm test          # node --test, everything except the bot simulations — run after every change
+npm run test:sim  # test/sim.test.ts, the bot simulations (~7 min) — run after a bot or balance change
 npm run typecheck # tsc --noEmit
 ```
 

TODO.md

@@ -81,7 +81,7 @@ Not items. Things that are true of every change, and that have gone wrong when s
 5. **Replays and saved games** — #14 #47 #48 #49 #50 #51 #52
 6. **Rules** — #12 #80 #82 #83 #85
 7. **Play balance** — #61 #62 #63 #64 #67 #68 #69 #70 #71 #72 #73 #66 #65 #74
-8. **The bot** — #41 #57 #59 #53 #54 #58 #55 #56 #60
+8. **The bot** — #104 #105 #106 #41 #57 #59 #54 #58 #55 #56 #60
 9. **Code health and housekeeping** — #46 #45 #84 #87
 10. **Documentation and assets** — #15a #86 #88
 
@@ -100,20 +100,119 @@ Everything else in this file waits behind a release; this waits behind an aftern
 **Test runs WERE made across 0.7.4 through 0.7.9** (Jesse, 2026-09-07) and produced no change
 requests — the two bugs that did come out of them are Gitea#21 and #22, fixed in v0.7.9.1. So this
 section is not "nobody has touched it since 0.7.4"; it is the narrower and still-true claim that the
-specific paths below have not been exercised at a table. **More testing is planned at the end of the
+specific paths below have not been exercised at a table.
-0.7.9 series, before 0.8.0 starts** — that is the moment to close these, not a separate errand.
+
+**The gate moved.** It was "before 0.8.0 starts"; 0.8.0 shipped anyway, through v0.8.0.8, so the
+session now runs against that build and covers what it added as well. See **Preparing the session**
+below — written 2026-09-10 because the measurement it rests on is the whole point: **three of the
+four things this section is named for do not happen by themselves.**
+
+### Preparing the session
+
+**MEASURED, 2026-09-10, across ten full competitive games driven to completion.** What a table will
+meet without trying, and what it will not:
+
+| interruption | fires in | so |
+| --- | --- | --- |
+| Superintendent clearance (§8.1) | **9/10 games** | you will meet it; just play |
+| a train held at the Limits | 7/10 | ditto |
+| Extras started and queued | 10/10 | ditto |
+| collisions | 7/10 | ditto |
+| Red Flags set / spent | 7/10, 6/10 | ditto |
+| **the Yard Office offer** | **0/10** | must be set up |
+| **the Red Flag hold and its prompt** | **0/10** | must be set up |
+| **extended play (`dayExtended`)** | **0/10** | must be set up |
+
+Those last three are exactly what #39 and #35 are NAMED for. They are not broken — they are
+conditional, and the conditions are these, read out of `advance.ts` rather than guessed:
+
+- **Yard Office** (`advance.ts` ~1290) needs the destination district to contain a card carrying the
+  `yardOffice` **enhancement**, AND an arriving train with **no coach** in its consist, AND a usable
+  route. The bot never builds one, so **somebody has to build a Yard Office and then let a freight
+  train arrive.**
+- **Red Flag hold** (`advance.ts` ~1232) needs the destination player to be **holding the Red Flags
+  maneuver card**, AND an arrival that would genuinely collide — §8.3's own two ways: no free A/D
+  track, or cars fouling the Running Track. So: **hold that card and let your A/D tracks fill.**
+- **Extended play** needs the timetable to RUN OUT, which a five-Day game does not do. Deal it with
+  **`days: 1`** — that is exactly what the 2026-08-29 API verification did, and why it got there.
+
+**What the session needs**
+
+- **Two people, two browsers, two devices.** #35's remaining gap is specifically what a SECOND
+  player sees while waiting on a first, and whether "waiting on Carol" still reads once Carol has
+  closed her laptop. That cannot be tested alone, and it is the half that has never been done.
+- **Two games, not one.** A short `days: 1` game to reach the extension vote, and an ordinary game
+  for everything else — with somebody deliberately building a Yard Office and holding Red Flags.
+- **#42a is separate and takes five minutes**, solitaire, one person: click every field on the setup
+  screen and confirm the dealt game matches what was chosen.
+
+**The caution this section exists because of.** #35's own Reference entry records that the
+2026-08-29 verification passed over the HTTP API — **which renders no dialog** — and that is exactly
+why the v0.7.9 bug survived: the vote sat underneath a modal results dialog whose only control was
+Close. What was proven was that the SERVER supports extended play, not that a player can reach it.
+Read that into every "verified on `phoenix.local`" line in this file, and into everything v0.8.0
+added, all of which is verified by test and simulation and none of it by eye.
+
+**What v0.8.0 added to this list**, none of it played by a person for a whole game and none with a
+second human: the watchable board and its ordered steps, the speed control, the pile highlighting and
+the Home Office deck tile, "Your Move" being put away while catching up, the Day-end collision line,
+and the Salvage Yard naming its top card.
+
+### The checklist
+
+Grouped by what has to be set up, with the item each observation closes. Nothing here needs a
+developer present; what it needs is somebody writing down what they saw.
+
+**Game A — `days: 1`, two humans, two browsers.** Reaches the extension vote in one Day.
+
+- [ ] The vote appears **in front of both players**, not underneath the results dialog (#35 — this is
+      the exact shape of the bug v0.7.9 fixed).
+- [ ] While one player has not voted, the other's turn chart says **who** it is waiting on (#35).
+- [ ] **Close the second laptop mid-vote.** Does the first player learn why nothing is happening, and
+      does "waiting on Carol" still read once Carol is gone? (#35 — never tested.)
+- [ ] Reopen it. The history panel comes back **populated**, not empty, and the board is current
+      (the v0.7.9.5 reconnect fix, never seen by a person).
+- [ ] Vote yes. The extra Day begins and the official result is **unchanged** from when the
+      timetable ran out (#35).
+
+**Game B — ordinary length, two humans, bots to fill.** Everything else.
+
+- [ ] Somebody **builds a Yard Office** and lets a freight train (no coach) arrive at it. The offer
+      interrupts the Mainline Phase and asks a question mid-thought — is it legible, and does it say
+      which train? (#39)
+- [ ] Somebody **holds the Red Flags card** while their A/D tracks are full, so an arrival would
+      collide. The hold is offered out of phase (#39).
+- [ ] A **loaded Extra** is made up and run (#39 — the third of its three).
+- [ ] Watch a bot take a whole turn: does the district follow it, does the lit pile catch the eye,
+      does the caption say who and what? (v0.8.0)
+- [ ] Find the speed that suits you and say what it is — it becomes the committed default.
+- [ ] Let the board fall behind, then press **Skip**. Nothing is lost; the history has it all.
+- [ ] End a Day with a collision on it: the summary reads "N on Day D, N in all" and cannot
+      contradict itself (v0.8.0.2).
+
+**Solitaire, five minutes, alone.**
+
+- [ ] Click through **every field** on the setup screen and confirm the dealt game matches what was
+      chosen (#42a).
+
+**Whatever else happens.** The two bugs that came out of the 0.7.4-0.7.9 runs were both things
+nobody set out to test. Write down anything that reads wrong, even where the rule underneath is
+right — most of this release's defects were legible-but-wrong rather than broken.
 
 - [ ] **#39** — **None of v0.7.4 has been played by a human.** The Yard Office offer, the Red Flag
       hold and its out-of-phase prompt, and the loaded-Extra make-up rules are tested end to end,
       packed, and running on `phoenix.local` — and nobody has met any of them at a board. **Two are
       interruptions that stop the Mainline Phase and put a question in front of somebody
-      mid-thought**, which is exactly the kind of thing only play reveals. See **Reference · #39**.
+      mid-thought**, which is exactly the kind of thing only play reveals. **Neither of those two
+      happens by itself — 0/10 games. See Preparing the session above for what to set up.** See
+      **Reference · #39**.
 
 - [ ] **#35** — **Extended play has never been played at a real table.** It was verified over the HTTP
       API, which renders no dialog — and when a human first reached it in a browser it was unusable
       (fixed in v0.7.9). The multiplayer vote has still never been driven through two browsers: what a
       second player sees while waiting, and whether "waiting on Carol" reads once Carol has closed her
-      laptop, are unanswered. See **Reference · #35**.
+      laptop, are unanswered. **Needs a `days: 1` game — the timetable does not run out in five
+      Days, so extended play fired in 0/10 measured games.** See **Reference · #35**.
 
 - [ ] **#42a** — **Nobody has clicked through the solitaire setup screen's own fields** and confirmed
       the dealt game matches what was chosen. It took three attempts to become reachable at all —
@@ -368,21 +467,37 @@ v0.7.9's collision-floor change (#61).
 The developer bot exists to measure the game, not to be a good opponent — so a bot weakness matters
 when it stops a measurement being trustworthy. **Read #57 before tuning any weights.**
 
+**Since 2026-09-14 the bot plans its whole switching turn** (`sim/switch-planner.ts`, +2.89 revenue a
+game), **takes a face-up card only if it could play it** (+1.52), and **since 2026-09-15 lays track by
+what the district can do afterwards** (`bestValuedLay`, +0.12 over 6400 seeds, run-arounds 9/60 → 22/60). Jesse's goal for it is better decisions in simulated runs AND at a real table, with no
+non-player advantage — it reads the board, never the deck.
+
+- [ ] **#104** — Weigh a switching turn against drawing and the Freight Agent. Letting the planned gain
+      gate switching on its own measured nothing (0.1, 0.25) or worse (0.5): `usefulSwitching` already
+      says yes exactly when a plan gains. What would matter is a VALUE for the other two options to
+      compare against, which the bot does not have. See **Reference · #104**.
+
+- [ ] **#106** — The Extra trap: a full hand of Extras the A/D cap is holding back cannot be discarded,
+      so the next draw forces one into a full Office. All 23 train plays past the cap in 40 games were
+      this. Avoiding the draw measured nothing (−0.03) because it stalled development. See
+      **Reference · #106**.
+
+- [ ] **#105** — Plan across more than one turn. Jesse is in favour, one turn first to see the impact —
+      which is now measured. Deferred for a conversation, not declined. See **Reference · #105**.
+
 - [ ] **#41** — The bot never plays Red Flags — zero in 200 games since Gitea#19, and that is deck
       luck rather than unwillingness. It takes the danger prompt unconditionally; what it never does
       is plant a flag ON PURPOSE to buy a Stage for switching, which needs it to know it wants time.
       See **Reference · #41**.
 
 - [ ] **#57** — The bot's priorities are not the problem — measured across ten heuristic variations.
-      **Read this before tuning weights**; it is the argument that the ceiling is elsewhere. See
+      **Read this before tuning weights**; it is the argument that the ceiling is elsewhere. **Part of
-      **Reference · #57**.
+      "elsewhere" was choosing one Move at a time**: planning the whole switching turn was worth
+      +2.89 (t = 15.8) in the 2026-09-14 bot-tuning round. See **Reference · #57**.
 
 - [ ] **#59** — The run-around is out of reach of any bot, and the deck is why — measured five ways.
       See **Reference · #59**.
 
-- [ ] **#53** — The bot does not know to bring an expedited train back to the station. See **Reference
-      · #53**.
-
 - [ ] **#54** — The bot cannot spot a car at a stub industry, and the cut-ordering rules made that
       visible. See **Reference · #54**.
 
@@ -1424,6 +1539,12 @@ measuring deck luck rather than reachability, and its comment now says so.
 
 #### #57 — THE BOT'S PRIORITIES ARE NOT THE PROBLEM — measured.
 
+**2026-09-14 — confirmed, and one ceiling found.** Reordering priorities still moves nothing; what
+moved the bot was SEARCH. `sim/switch-planner.ts` plans the whole switching turn against a score of
+where it ends, and measured +2.89 ± 0.18 (t = 15.79) over 1600 paired seeds — freight loads and
+unloads 0.22 → 1.53, Cargo phases with a car spotted 5% → 18%. The "8% of Cargo phases" below was a
+fact about how the bot switched, not only about the deck. See `CHANGELOG.md`, 0.8.0.9.
+
 **THE BOT'S PRIORITIES ARE NOT THE PROBLEM — measured.** Ten heuristic variations, each paired
 
 over 400+ seeds. Every reordering of what the bot prefers came out inside the noise; the only
@@ -1449,6 +1570,21 @@ prioritised better. What is left is the economy itself, which is a deck question
 
 #### #59 — THE RUN-AROUND IS OUT OF REACH OF ANY BOT, AND THE DECK IS WHY — measu…
 
+**2026-09-14 — part of "the deck is why" was the bot's own draw.** It was taking ~32 face-up trains and
+industries a game it could not play and discarding them again, so the hand rarely held track. Taking
+only playable cards (now the default) grew districts 14 → 24 cards and run-arounds 3/60 → 9/60. And
+~13 of the ~16 track pieces a game were being laid by the draw turn's "play what is in hand" fallback
+at the first legal square, not by `bestTrackLay`; holding them (−0.83) and placing them by
+`bestTrackLay`'s score (+0.07, noise) both failed, so the next limit is that SCORING — it cannot tell a
+piece that opens an industry site or advances a run-around from one that fills a square. The deck
+measurements below were taken before any of this and should be re-read with it in mind.
+
+**2026-09-15 — the scoring, fixed.** `bestValuedLay` scores the layout a lay leaves (reachable industry
+sites, a closed run-around, ways off the main) instead of the piece: closed run-arounds in 22 of 60
+districts against 9, +0.118 ± 0.029 revenue (t = 4.14, 6400 seeds). The run-around is now reachable
+without changing the deck; what is left is a bot that can USE one, which needs more than one turn of
+planning (#105).
+
 **THE RUN-AROUND IS OUT OF REACH OF ANY BOT, AND THE DECK IS WHY — measured, five ways.**
 
 "Teach the bot to plan across turns" was tried properly and does not work. Every attempt is
@@ -1490,6 +1626,8 @@ the end of the game, drawing the fault **26 times**. Not an engine bug — the m
 exactly as designed — but a clear next bot heuristic: prefer ending a switching turn with any
 expedited crew back on the Office square, at least once it has finished the work it went out for.
 
+**CLOSED 2026-09-14** — see **Done · 53**.
+
 #### #54 — THE BOT CANNOT SPOT A CAR AT A STUB INDUSTRY, and the cut-ordering rul…
 
 **THE BOT CANNOT SPOT A CAR AT A STUB INDUSTRY, and the cut-ordering rules made that visible.**
@@ -1511,6 +1649,12 @@ pass should not read the drop as a deck problem.
 
 #### #58 — The bot cannot get a crew next to an industry, so Flying Switch never…
 
+**2026-09-14 — the premise is now a deck fact.** Flying Switch is dealt **0 copies** (not in sheet 5;
+Jesse, 2026-08-26), so no bot can fire it: across 30 standard games none was ever drawn. The switching
+planner searches the card by default, so it will be used the day it is dealt again. The reachability
+sweep's exemption in `sim.test.ts` stays until then.
+
+
 **The bot cannot get a crew next to an industry, so Flying Switch never fires.** Industries are
 
 now stub-only and the bot places 2.23 a game (was 3.84), in districts averaging under two rows
@@ -1558,6 +1702,114 @@ of zero" over 400 games — but at 400 games the standard error is ±0.33, so a
 have looked like nothing. They are nearly free to re-run now and at least one may have been
 discarded wrongly.
 
+#### #104 — WEIGH SWITCHING AGAINST THE OTHER TWO OPTIONS, not against a threshold.
+
+Measured 2026-09-14, paired over 400 seeds against the planner: switching only when the planned gain
+clears a threshold scored −0.33 at 0.5 (t = −5.06), −0.01 at 0.25, +0.06 at 0.1 (t = 1.79). At 0.5 it
+refuses turns that only collect cars, which feed later deliveries; below that it agrees with
+`usefulSwitching`. The choice that is still made by a fixed ladder is WHICH of §6's three options a
+Stage goes to, and the planner can now put a number on one of them. The other two need numbers of
+their own — what a draw is worth given the hand and the Departments, what stocking a box is worth given
+the cars spotted — before the three can be compared. Also: planning at every Local Operations decision
+costs a full search each time, so any version of this has to stay cheap.
+
+**2026-09-15 — measured the ceiling first: there is almost none.** At 907 real Local Operations choices
+(75 standard games, seeds outside the usual measurement range), every legal option was tried and the rest
+of the game played out by today's bot, 4 times each with the HIDDEN parts reshuffled — the Home Office
+deck order and future rolls — and the same reshuffles for every option, so the comparison is paired.
+Grouped by the rule that made the choice, the value of each alternative against it:
+
+| the ladder chose | times | switch instead | draw instead | Freight Agent instead |
+| --- | --- | --- | --- | --- |
+| draw — nothing urgent, develop | 494 | +0.08 ± 0.12 | — | +0.02 ± 0.04 |
+| Freight Agent — feed the pipeline | 147 | +0.07 ± 0.06 | −0.01 ± 0.04 | — |
+| switch — a train with work at the Office | 108 | — | −0.17 ± 0.10 | −0.25 ± 0.08 |
+| draw — an Office upgrade in hand | 100 | +0.21 ± 0.16 (6) | — | −0.08 ± 0.06 |
+| switch — walk the crew home | 47 | — | +0.22 ± 0.14 | −0.15 ± 0.08 |
+| draw — a train card in hand | 11 | — | — | −0.45 ± 0.24 |
+
+No rule has an alternative that is significantly better; where the table leans, the ladder is usually
+the one that is right. So given how the bot plays each option once chosen, the choice itself is close to
+optimal, and value functions for draw and Freight Agent have little to find. The one lean worth a look if
+this is reopened is walking a stranded crew home (+0.22, t ≈ 1.6). The rollout tool is analysis only —
+the bot never sees a rollout.
+
+#### #106 — THE EXTRA TRAP — why the cap on committed trains still lets an Office overfill.
+
+**2026-09-15 — re-measured under today's defaults, and most of it is not the Extra trap.** 20 "no free
+A/D track" collisions in 60 standard games, −1.67 revenue a game. No train was held (§8.2 or clearance) in
+the Stage before any of them, and only 8 of the 20 trains destroyed were Extras. **Six destroyed a train
+of the same number as a Second Section run within the previous two Stages — and all 26 Second Sections
+the bot ran in those games were an accident:** the New Train phase's "no car on offer" fallback takes
+`options[0]`, and `legalActions` lists `newTrain.secondSection` ahead of the Extra starts, so whenever an
+Extra was waiting to start the bot doubled the train due out instead. The Office never had an A/D track
+to spare for one.
+
+**A RULES QUESTION FOR JESSE, found on the way — not a bot matter.** Q9 (`implications.md`) defines the
+Second Section as a CARD "played on a train that is due out", and `content.ts` defines `SECOND_SECTION`
+with 1 copy — but `buildDeck` never deals it, and `check`'s `newTrain.secondSection` asks for no card in
+hand. So any player may run a Second Section for free on every train due out. Either the card should be
+dealt and required, or the free action is the intended rule and Q9's wording is stale.
+
+Also measured and removed: starting an over-cap Extra where its run never reaches the Office (+0.10,
+t = 1.82) — such a start was on offer at 1 of 25 over-cap starts.
+
+**The accident is fixed** (2026-09-15, default): the New Train fallback takes a car, a pass or the
+Extra's start, never `options[0]` — +0.32 ± 0.09 (t = 3.64), collisions 0.24 → 0.19. **Still open under
+this item:** the forced Extra itself (a full, undiscardable hand of Extras), and the Second Section card
+question above.
+
+`choose` removes train-card plays from the options when `trainWouldOverfillTheOffice`, but yields if
+that would leave nothing legal. It does leave nothing legal in one ordinary position: the hand is over
+the limit (§6.2 requires reducing it) and every card in it is an Extra, which `keepReason` forbids
+discarding. Measured 2026-09-14 after the face-up take rule: 23 of 196 train plays in 40 games were past
+the cap, every one "play what is in hand" with four Extras held, and the worst seeds each lost 3-4
+collisions to it. Declining the draw option in that position measured −0.03 ± 0.11 — collisions fell
+0.26 → 0.20 but cards played fell 29.0 → 25.6. Better answers to try: play the Extra at the least
+dangerous moment rather than the first, count WHEN each committed train is due at the Office instead of
+how many there are, or keep the hand from filling with Extras in the first place.
+
+#### #105 — PLAN ACROSS TURNS — the evidence so far, for the conversation.
+
+For: one-turn planning already reaches most switching work (Cargo phases with a car spotted 5% → 18%),
+and what it cannot do is exactly what spans a Stage — leave a car on a spur for the next crew, or start
+a run-around and finish it later. The planner already scores staged wanted cars (+0.2), which is a
+first, crude step in that direction.
+
+Against, for now: everything between two switching turns is not the player's — a Mainline Phase, trains
+arriving, a Load/Unload phase — so a second turn cannot be searched the way the first is without either
+simulating those phases (arrivals are on the public timetable, but cars on arriving trains are not
+known) or scoring the position between turns more cleverly. And search cost is already what sets the
+test suite's running time. Cheapest next step if taken up: a better score for "what the next turn can
+still reach", not a deeper search.
+
+**2026-09-15 — the run-around measurement that bears on this.** A candidate that lays track by what the
+district can do afterwards (`valueLays`) more than doubled closed run-arounds, 9/60 → 22/60, yet moved
+revenue only +0.14 ± 0.06 (t = 2.58, 1600 seeds). Traced over 40 games: the one-turn planner DOES use
+the loop — 63 of 131 plans in a district with one end a move on it, 35 run it both ways — but its planned
+gain per turn is the same with a run-around as without (0.28 against 0.27). A run-around is for putting a
+train's cars in a different order, which pays off in the turns after; a planner that looks one turn
+ahead has no way to value it.
+
+**2026-09-15 — two-turn planning, built and measured: it does not pay.** `planTwoTurns` kept the six best
+ends of a switching turn, removed the trains that would highball in the Mainline Phase in between (on the
+Office square and made up — their cars leave with them), reset the Moves, planned the next turn from each,
+and chose by the position after departures plus 0.8 of what the next turn adds. Nothing hidden is read.
+
+| version | revenue, 400 paired seeds | what went wrong |
+| --- | --- | --- |
+| first | −0.28 ± 0.11 (t = −2.58) | an expedited train left away drew 31 faults in one game: the fault is charged in the gap, which the discounted next turn "recovered"; trains left away 5.3 a game against 3.1 |
+| with the gap fault charged in full and 0.5 a Stage per train left away | −0.14 ± 0.06 (t = −2.36) | trains still left away 4.8 a game; the "crew must get back to the Office" choice 4.2 a game against 2.7 |
+
+Why a second turn has so little to find, measured over 30 standard games:
+- only **49%** of switching turns have the same train in the district at the next Local Operations choice;
+- **6.1 wanted cars a game** do leave aboard departing trains — but a further switching turn from those
+  exact positions could have spotted only **0.7** of them: most were never deliverable;
+- the one-turn planner already gains no more with a run-around than without (0.28 against 0.27).
+And what a second turn COSTS is a Stage: trains left away have to be walked home, and those choices come
+out of drawing and the Freight Agent (cards played 28.8 → 28.3). A multi-turn bot would have to weigh
+switching against the other two options — which is #104, not a deeper search.
+
 ### Code health and housekeeping
 
 #### #46 — tsc --noUnusedLocals finds 29 unused declarations across 14 files, and…
@@ -1801,6 +2053,15 @@ where it belongs, and it is still open.
 Closed items, kept because several are the only record of a ruling or a lesson. Newest first within
 each group.
 
+### Closed in the 2026-09-14 bot-tuning round (unreleased)
+
+53. ~~**The bot did not know to bring an expedited train back to the station.**~~ — done 2026-09-14,
+    not by a heuristic of its own but as a consequence of planning the switching turn: the planner's
+    score charges an expedited train left away from the Office a full Revenue point, which is what Q3
+    charges. Over 400 paired seeds, 19 games drew expedite faults under the rule ladder and **none**
+    under the planner, worth +1.07 a game (t = 3.83) — the two worst cases had drawn 45 and 42 faults
+    in a single game. See `CHANGELOG.md`, 0.8.0.9.
+
 ### Shipped through v0.7.9.8, from the queue
 
 Closed items, newest first. Kept because several of them are the only record of a ruling or a lesson;

docs/plans/jitsi-common-board.md

@@ -361,14 +361,15 @@ Introduce dedicated allow-listed types. Do not derive them with `Omit<Frame, ...
 > **Read those two, not this**, when building steps 2-7. The differences that matter:
 >
 > - **The shape is FLAT, not grouped.** There is no `clock`, `config`, `scoring` or `deckCounts`
->   object. Their contents sit at the top level. **All 37 properties, which is the same list as
+>   object. Their contents sit at the top level. **All 38 properties, which is the same list as
 >   `test/redaction.test.ts`'s allow-list** — `day`, `stage`, `clock` (a time string), `phase`,
 >   `phaseKey`, `actor`, `superintendent`, `deck`, `departments`, `departmentsWhat`,
 >   `departmentDepth`, `salvage`, `yards`, `timetable`, `timetableWhat`, `houseRules`, `mode`,
 >   `optionalRules`, `days`, `minCombinedRevenue`, `maxCollisionsPerDay`, `maxCollisionsTotal`,
->   `collisionsToday`, `collisionsTotal`, `status`, `outcome`, `extraDays`, `extensionVotes`,
+>   `collisionsToday`, `collisionsPrevDay`, `collisionsTotal`, `status`, `outcome`, `extraDays`,
+>   `extensionVotes`,
 >   `official`, `tally`, `players`, `openingRolls`, `trains`, `crewTrays`, `queued`, `division`,
->   `districts`. The first 35 come from `projectSharedTable`; `division` and `districts` are added
+>   `districts`. The first 36 come from `projectSharedTable`; `division` and `districts` are added
 >   by `PublicFrame` itself.
 > - **`protocolVersion` was NOT built** and exists nowhere in the repo. **Decided 2026-09-09: add it
 >   in step 2.** `display.json` carries its own `schemaVersion`, and the SSE wire format is a second,
@@ -887,7 +888,7 @@ Cover:
 ## Step 5 — Minimal visual-only Jitsi engine
 
 > **v0.9.0 — DEFERRED (2026-09-09).** Steps 5-7 are the Jitsi publisher and are explicitly held
-> off until 0.8.0 ships and Chromium has been measured on `phoenix.local`. Nothing below has been
+> off until 0.8.0 ships and Chromium has been measured on the target hardware. Nothing below has been
 > re-verified against the current code; it was written 2026-08-27. Two things will have moved by
 > the time it is picked up: the control channel is **SSE + POST, not a WebSocket** (§ THE RELEASE
 > SPLIT), and adding Chromium takes the `.s9pk` from 63 MB to several hundred against a package
@@ -1027,7 +1028,7 @@ Port/adapt the sibling repository’s proven tests for:
 ## Step 6 — Chromium publisher supervisor
 
 > **v0.9.0 — DEFERRED (2026-09-09).** Steps 5-7 are the Jitsi publisher and are explicitly held
-> off until 0.8.0 ships and Chromium has been measured on `phoenix.local`. Nothing below has been
+> off until 0.8.0 ships and Chromium has been measured on the target hardware. Nothing below has been
 > re-verified against the current code; it was written 2026-08-27. Two things will have moved by
 > the time it is picked up: the control channel is **SSE + POST, not a WebSocket** (§ THE RELEASE
 > SPLIT), and adding Chromium takes the `.s9pk` from 63 MB to several hundred against a package
@@ -1160,7 +1161,7 @@ Use fake child processes and fake control sockets to test:
 ## Step 7 — Configuration, lifecycle, packaging, and observability
 
 > **v0.9.0 — DEFERRED (2026-09-09).** Steps 5-7 are the Jitsi publisher and are explicitly held
-> off until 0.8.0 ships and Chromium has been measured on `phoenix.local`. Nothing below has been
+> off until 0.8.0 ships and Chromium has been measured on the target hardware. Nothing below has been
 > re-verified against the current code; it was written 2026-08-27. Two things will have moved by
 > the time it is picked up: the control channel is **SSE + POST, not a WebSocket** (§ THE RELEASE
 > SPLIT), and adding Chromium takes the `.s9pk` from 63 MB to several hundred against a package

package.json

@@ -1,6 +1,6 @@
 {
   "name": "station-master",
-  "version": "0.8.0.1",
+  "version": "0.8.0.10",
   "private": true,
   "type": "module",
   "description": "Station Master — a railroad operations game",
@@ -10,7 +10,9 @@
   "scripts": {
     "typecheck": "tsc --noEmit",
     "pretest": "tsc --noEmit && node scripts/build-web.ts",
-    "test": "node --test test/*.test.ts test/**/*.test.ts",
+    "test": "node --test $(ls test/*.test.ts test/**/*.test.ts | grep -v '^test/sim.test.ts$')",
+    "pretest:sim": "tsc --noEmit",
+    "test:sim": "node --test test/sim.test.ts",
     "build:web": "node scripts/build-web.ts",
     "serve:web": "node scripts/build-web.ts && npx --yes http-server dist -p 8080 -c-1",
     "deploy:web": "node scripts/deploy-web.ts",

src/engine/advance.ts

@@ -94,6 +94,18 @@ function nodeIndexOfOffice(s: GameState, seat: SeatIndex): number {
 
 const step = (d: Direction): number => (d === 'east' ? 1 : -1);
 
+/** The Division node a train is standing on — its Office, its Mainline card, or its Division Point. */
+function nodeIndexOfTray(s: GameState, tray: CrewTray): number | null {
+  const at = tray.position;
+  if (at.at === 'grid') return nodeIndexOfOffice(s, at.seat);
+  if (at.at === 'mainline') return at.index;
+  if (at.at === 'divisionPoint') {
+    const side = at.side;
+    return s.division.nodes.findIndex((n) => n.kind === 'divisionPoint' && n.side === side);
+  }
+  return null;
+}
+
 // ---------------------------------------------------------------------------
 // advance
 // ---------------------------------------------------------------------------
@@ -522,8 +534,11 @@ type MoveOutcome = 'moved' | 'held' | 'needsClearance';
  *
  * This is reachable purely through switching. A train arrives made up, and only comes apart because
  * the player took cars onto the nose or picked up a cut in a run-around.
+ *
+ * Exported for the switching planner (`sim/switch-planner.ts`), which has to know whether a plan
+ * leaves a train unable to run — and must ask this rule rather than keep a copy of it.
  */
-function badlyMadeUp(tray: CrewTray): string | null {
+export function badlyMadeUp(tray: CrewTray): string | null {
   const n = tray.consist.length;
   if (n === 0) return null;
   const pulling = tray.engineAt === 0;
@@ -1064,10 +1079,27 @@ function evaluateClearance(
    * constrained. Each Office upgrade to a Control Point splits one in two and buys capacity.
    */
   const subdivision = subdivisions(s).find((group) => group.includes(targetIndex)) ?? [targetIndex];
+  /**
+   * ONLY WHAT IS AHEAD (Gitea#26). §8.1 asks about a train the considered train would FOLLOW, and one
+   * moving TOWARDS it — both of which are ahead of it. A Subdivision runs the length of every Whistle
+   * Post between two Control Points, so it can hold a train BEHIND the one departing: in the reported
+   * game X15 highballed west from an Office while X18, also westbound, was still crossing the card to its
+   * east. Counting X18 put a meaningless ruling to the Superintendent; holding X15 kept the Whistle Post's
+   * one A/D track full, and X18 arrived into it and was destroyed. A train behind and moving away is no
+   * threat at all.
+   *
+   * "Behind" is strictly behind the card the departing train stands on. A train on that same card is still
+   * counted, exactly as before: which of two trains sharing a card is in front is `entryConflict`'s region
+   * question, and this is not the place to answer it.
+   */
+  const from = nodeIndexOfTray(s, tray);
+  const behind = (onCard: number): boolean =>
+    from !== null && from >= 0 && (tray.direction === 'east' ? onCard < from : onCard > from);
   const occupants: { tray: TrayId; onCard: number }[] = [];
   for (const i of subdivision) {
     const n = s.division.nodes[i];
     if (!n || n.kind !== 'mainline') continue;
+    if (behind(i)) continue;
     for (const t of n.transits) if (t.tray) occupants.push({ tray: t.tray, onCard: i });
   }
 
@@ -1638,6 +1670,9 @@ function shiftChange(s: GameState, events: GameEvent[]): AdvanceResult {
 
     s.clock.day += 1;
     s.clock.stage = 1;
+    // Captured BEFORE the reset: the Day-end dialog reports the Day that just finished, and it is
+    // drawn from the frame this rollover produces. See `collisionsPrevDay` in `state.ts`.
+    s.collisionsPrevDay = s.collisionsToday;
     s.collisionsToday = 0;
     events.push({ type: 'stageBegan', day: s.clock.day, stage: 1 });
     rotateSeats(s, events);

src/engine/apply.ts

@@ -1508,17 +1508,48 @@ export function selectDestination(
   return chosen ?? atTo[0];
 }
 
+/**
+ * ROUTES, WALKED ONCE PER POSITION.
+ *
+ * A route walk (`reachableDestinations`) was a third of all simulation time, and most of it was the
+ * same walk repeated: `legal.ts` walks a tray's routes to list its moves, then `check` walks them again
+ * for every one of those moves, and `applyIntent` walks the chosen one a third time in `execute`.
+ * Profiled 2026-09-14 with inlining off: `reachableDestinations` 34% inclusive, garbage collection 34%.
+ *
+ * So while one position is being examined — a legal-action listing, or the check and execute of one
+ * intent — a walk is kept and reused. Both scopes read the state and never write it, the key names
+ * everything the walk depends on besides that state, and the cache is keyed to the state OBJECT and
+ * cleared when the scope ends, so a hit returns exactly what a fresh walk would have. Nothing may
+ * mutate a returned route; nothing does.
+ */
+let routeCache: { state: GameState; routes: Map<string, MoveDestination[]> } | null = null;
+
+export function withRouteCache<T>(s: GameState, fn: () => T): T {
+  if (routeCache) return fn();
+  routeCache = { state: s, routes: new Map() };
+  try {
+    return fn();
+  } finally {
+    routeCache = null;
+  }
+}
+
 function destinationsFor(
   s: GameState,
   player: PlayerIndex,
   trayId: TrayId,
   from: GridCoord,
   reverse: boolean,
-) {
+): MoveDestination[] {
+  const cache = routeCache?.state === s ? routeCache.routes : null;
+  const key = cache ? `${player}|${trayId}|${from.row},${from.col}|${reverse ? 1 : 0}` : '';
+  const hit = cache?.get(key);
+  if (hit) return hit;
+
   const tray = s.trays.get(trayId)!;
   const facing = facingPort(s, trayId);
   const exit: Port = reverse ? reversePort(s, player, from, facing) : facing;
-  return reachableDestinations(
+  const routes = reachableDestinations(
     {
       area: areaOf(s, player),
       occupancy: occupancyFor(s, player, trayId),
@@ -1528,6 +1559,8 @@ function destinationsFor(
     from,
     exit,
   );
+  cache?.set(key, routes);
+  return routes;
 }
 
 /**
@@ -1856,7 +1889,15 @@ function execute(s: GameState, player: PlayerIndex, i: Intent): GameEvent[] {
           ? REALIGNMENTS.find((r) => r.from === node.card)?.to
           : undefined;
       return [
-        { type: 'mainlineModified', player, cardId: i.cardId, node: i.node, key, ...(became ? { became } : {}) },
+        {
+          type: 'mainlineModified',
+          player,
+          cardId: i.cardId,
+          node: i.node,
+          key,
+          ...(node?.kind === 'mainline' ? { from: node.card } : {}),
+          ...(became ? { became } : {}),
+        },
       ];
     }
 
@@ -2242,7 +2283,8 @@ export function reduce(s: GameState, e: GameEvent): void {
       // Everything swept comes back as ONE pile, then §4.6-4.7's opening is re-run: three cards
       // turned face up as the Departments, the rest face down as the Home Office deck. The
       // Departments start one deep again, exactly as at setup.
-      s.decks.salvageYard = [];
+      // The spent trains stay where they are; everything else in the Yard has just been swept up.
+      s.decks.salvageYard = s.decks.salvageYard.filter((id) => isSpentTimetabledTrain(s, id));
       s.decks.departments = [[], [], []];
       const order = [...e.order];
       for (const pile of s.decks.departments) {
@@ -2473,7 +2515,15 @@ export function reduce(s: GameState, e: GameEvent): void {
     case 'trainScheduled':
       s.timetable[e.slot] = e.trainNumber;
       s.rngState = e.rngState;
-      s.decks.salvageYard.push(`train-${e.trainNumber}`);
+      /**
+       * THE CARD IS ALREADY IN THE SALVAGE YARD — `cardPlayed` put it there, by its real id.
+       *
+       * This used to push a second, SYNTHETIC `train-<number>` beside it, so scheduling four trains
+       * left eight entries in a pile holding four cards. Nothing ever read that id: it inflated the
+       * pile's depth, it displayed as "a card" because no such card exists, and
+       * `reshuffleIfDepleted` would have swept it into the draw deck to be drawn as an id with
+       * nothing behind it. Removed 2026-09-10 (Gitea#23).
+       */
       break;
 
     case 'carPlacedOnTrain': {
@@ -2693,7 +2743,8 @@ export function reduce(s: GameState, e: GameEvent): void {
  * index is out of range, which `check` reports rather than silently defaulting — a wrong
  * orientation is a different card, not a detail.
  */
-function protoCard(
+/** Exported for the same reason as `extendLimitsIfNeeded`: the bot builds the card a lay would place exactly as the reducer does. */
+export function protoCard(
   kind: { kind: string; geometry?: string; facility?: string; hand?: string },
   variant: number | undefined,
 ): TrackCard | null {
@@ -2930,9 +2981,34 @@ function spendCard(s: GameState, player: PlayerIndex, cardId: CardId): void {
  * that has genuinely used every card ends on `DECK_EMPTY` rather than reshuffling an empty pile.
  * Cards played onto the board are NOT recovered: they are on the table, which is where they belong.
  */
+/**
+ * §6.2, AND THE RULING THAT SETTLES IT — Jesse, 2026-09-10 (Gitea#23).
+ *
+ * "Once you've played a regularly scheduled train and it's in the salvage deck, that train is
+ * already on the timetable. It does not make sense to put that back into a reshuffled home deck to
+ * get played again. By contrast, a regularly scheduled train that's in a discard pile could
+ * potentially get reused later, and so should have that capability. Extras run one time and then
+ * they're done — if they are in the Salvage deck, they should get shuffled back in so that they
+ * could get run again."
+ *
+ * So the test is WHERE the card is, not only what it is. A timetabled train in the SALVAGE YARD was
+ * played: its number is on the timetable and cannot be scheduled twice, so the card is spent and
+ * stays out. The same card sitting in a DEPARTMENT was discarded, never played, and its slot is
+ * still open — so it comes back with everything else. An Extra is a single run rather than a
+ * standing slot, so a played one is free to be run again.
+ */
+function isSpentTimetabledTrain(s: GameState, id: CardId): boolean {
+  return s.cards.get(id)?.kind.kind === 'timetabledTrain';
+}
+
 function reshuffleIfDepleted(s: GameState, taking: number): GameEvent | null {
   if (s.decks.homeOffice.length > taking) return null;
-  const collected = [...s.decks.salvageYard, ...s.decks.departments.flat()];
+  const collected = [
+    // The Salvage Yard, less the trains whose slots are already filled — see above.
+    ...s.decks.salvageYard.filter((id) => !isSpentTimetabledTrain(s, id)),
+    // Every Department in full: a discarded train was never played, so it is still runnable.
+    ...s.decks.departments.flat(),
+  ];
   if (collected.length === 0) return null;
   const rng = createRng(s.rngState);
   return { type: 'deckReshuffled', order: rng.shuffle(collected), rngState: rng.getState() };
@@ -3059,7 +3135,8 @@ function applyModifier(area: OfficeArea, coord: GridCoord, modifier: ModifierKin
  * §8.1 and §10 both reason about "the track between the train and the Limits", Interlocking holds
  * an arrival AT the Limits, and running past a player's Limits is what makes a collision his fault.
  */
-function extendLimitsIfNeeded(area: OfficeArea, placed: GridCoord): void {
+/** Exported so the bot can score a lay on a copy of the district by the engine's own rule, not a copy of it. */
+export function extendLimitsIfNeeded(area: OfficeArea, placed: GridCoord): void {
   if (placed.row !== area.runningRow) return;
 
   if (placed.col <= area.limitsWest.col) {
@@ -3253,16 +3330,35 @@ function limitsCard(): TrackCard {
 // Public entry point
 // ---------------------------------------------------------------------------
 
-export function applyIntent(s: GameState, player: PlayerIndex, i: Intent): ApplyResult {
+/**
-  const code = check(s, player, i);
+ * THE FIRST HALF OF `applyIntent`: decide, without changing anything.
-  if (code) return { ok: false, code, message: `${i.type} rejected: ${code}` };
+ *
+ * `check` and `execute` read the same unchanged position, so its routes are walked once between them
+ * (`withRouteCache`). Never writes `s`. Split out for a caller that decides many intents against ONE
+ * position and applies each to a COPY of it — the switching planner — which can then share that
+ * position's routes across every candidate instead of re-walking them on each copy.
+ */
+export function prepareIntent(s: GameState, player: PlayerIndex, i: Intent): ApplyResult {
+  const prepared = withRouteCache(s, (): { code: RejectionCode } | { events: GameEvent[] } => {
+    const code = check(s, player, i);
+    return code ? { code } : { events: execute(s, player, i) };
+  });
+  if ('code' in prepared) return { ok: false, code: prepared.code, message: `${i.type} rejected: ${prepared.code}` };
+  return { ok: true, events: prepared.events };
+}
 
-  const events = execute(s, player, i);
+/** THE SECOND HALF: fold events `prepareIntent` produced into a state equal to the one it read. */
+export function commitEvents(s: GameState, events: readonly GameEvent[]): void {
   for (const e of events) reduce(s, e);
   // Gitea#16 — the intent half of the fold; `advance` does the phase driver's half. See `tally.ts`
   // for why it cannot simply live inside `reduce`.
   for (const e of events) tallyEvent(s, e);
-  return { ok: true, events };
+}
+
+export function applyIntent(s: GameState, player: PlayerIndex, i: Intent): ApplyResult {
+  const r = prepareIntent(s, player, i);
+  if (r.ok) commitEvents(s, r.events);
+  return r;
 }
 
 export { isOperationalRail, destinationsFor };

src/engine/events.ts

@@ -87,7 +87,13 @@ export type GameEvent =
   | { type: 'deckReshuffled'; order: CardId[]; rngState: number }
   /** `variant` is the chosen orientation (Gap 11); it must be replayable, so it rides the event. */
   | { type: 'cardPlayed'; player: PlayerIndex; cardId: CardId; placement?: GridCoord; variant?: number }
-  | { type: 'mainlineModified'; player: PlayerIndex; cardId: CardId; node: number; key: string; became?: string }
+  /**
+    * `from` is the card's kind BEFORE the change, carried so the log can say what was realigned
+    * rather than only what it turned into (playtest, 2026-09-15: "it should state that the mainline
+    * card 3 curves was converted to plains"). Events are derived by replaying a save, never stored,
+    * so widening one strands nothing on disk.
+    */
+  | { type: 'mainlineModified'; player: PlayerIndex; cardId: CardId; node: number; key: string; from?: string; became?: string }
   /** §Q (Gitea#19) — a flag planted on one side of a district's Limits. */
   | { type: 'redFlagsSet'; player: PlayerIndex; cardId: CardId; seat: SeatIndex; side: Direction }
   /** §Q (Gitea#19) — the flag stopped a train and came down with it. One card, one train. */

src/engine/legal.ts

@@ -14,7 +14,7 @@
 
 import type { CarType, Hand, TrackGeometry } from './content.ts';
 import { enhancementRule, mainlineProfile } from './content.ts';
-import { check, areaOf, destinationsFor } from './apply.ts';
+import { check, areaOf, destinationsFor, withRouteCache } from './apply.ts';
 import type { Intent } from './intents.ts';
 import type { GameState, GridCoord, PlayerIndex } from './state.ts';
 import { coordKey, seatOf } from './state.ts';
@@ -53,7 +53,80 @@ const CAR_TYPES: readonly CarType[] = ['coach', 'boxcar', 'reefer', 'hopper', 't
 
 /** Every intent `player` may legally submit right now. */
 export function legalActions(s: GameState, player: PlayerIndex): Intent[] {
-  return candidates(s, player).filter((i) => check(s, player, i) === null);
+  // One position, examined many times over: its routes are walked once (`withRouteCache`).
+  return withRouteCache(s, () => candidates(s, player).filter((i) => check(s, player, i) === null));
+}
+
+/**
+ * §6.1 — the switching half of the Local Operations candidates, in the order `legalActions` offers
+ * them. Split out so the switching planner (`sim/switch-planner.ts`) can ask for just these without
+ * `check` running over every draw and Freight Agent candidate at each of the thousands of positions it
+ * tries — that was about a quarter of all planning time. Still no rules here: `check` decides.
+ */
+function switchCandidates(s: GameState, player: PlayerIndex): Intent[] {
+  const out: Intent[] = [];
+  for (const [trayId, tray] of s.trays) {
+    if (tray.position.at !== 'grid' || tray.position.seat !== seatOf(s, player)) continue;
+    const from = tray.position.coord;
+    for (const reverse of [false, true]) {
+      const dests = destinationsFor(s, player, trayId, from, reverse);
+      // Grouped by destination square so `distinguishingVia` only ever compares routes that are
+      // actually racing for the same button — two routes to DIFFERENT squares need no `via` to
+      // tell apart, `to` already does that.
+      const byCoord = new Map<string, MoveDestination[]>();
+      for (const d of dests) {
+        const k = coordKey(d.coord);
+        (byCoord.get(k) ?? byCoord.set(k, []).get(k)!).push(d);
+      }
+      for (const group of byCoord.values()) {
+        for (const d of group) {
+          const via = group.length > 1 ? distinguishingVia(d, group) : undefined;
+          out.push({ type: 'switch.move', trayId, to: d.coord, reverse, ...(via ? { via } : {}) });
+        }
+      }
+    }
+    for (let n = 1; n <= tray.consist.length; n++) {
+      out.push({ type: 'switch.dropCars', trayId, count: n });
+      // Off the nose as well as the tail — the only way to get cars back off the front of a train
+      // that shoved a cut, and therefore the only way an engine buried mid-train reaches an end.
+      out.push({ type: 'switch.dropCars', trayId, count: n, fromNose: true });
+    }
+    // Small Yard: enumerating every permutation would explode, so offer the useful ones —
+    // bringing each car to the droppable end, plus a full reversal. `check` validates any order,
+    // so a UI may submit an arbitrary permutation.
+    const n = tray.consist.length;
+    if (n > 1) {
+      for (let k = 0; k < n; k++) {
+        const order = [...Array(n).keys()].filter((x) => x !== k);
+        order.push(k);
+        out.push({ type: 'switch.sortConsist', trayId, order });
+      }
+      out.push({ type: 'switch.sortConsist', trayId, order: [...Array(n).keys()].reverse() });
+    }
+  }
+  // Flying Switch — roll a cut into an ADJACENT industry without the engine entering it.
+  for (const cardId of s.decks.hands.get(player) ?? []) {
+    const k = s.cards.get(cardId)?.kind;
+    if (k?.kind !== 'maneuver' || k.key !== 'flyingSwitch') continue;
+    for (const [trayId, tray] of s.trays) {
+      if (tray.position.at !== 'grid' || tray.position.seat !== seatOf(s, player)) continue;
+      const from = tray.position.coord;
+      for (const reverse of [false, true]) {
+        for (const d of destinationsFor(s, player, trayId, from, reverse)) {
+          for (let count = 1; count <= tray.consist.length; count++) {
+            out.push({ type: 'maneuver.flyingSwitch', cardId, trayId, count, to: d.coord });
+          }
+        }
+      }
+    }
+  }
+  out.push({ type: 'switch.end' });
+  return out;
+}
+
+/** The switching intents `player` may legally submit right now — exactly `legalActions`' switching subset. */
+export function legalSwitchingActions(s: GameState, player: PlayerIndex): Intent[] {
+  return withRouteCache(s, () => switchCandidates(s, player).filter((i) => check(s, player, i) === null));
 }
 
 export function isLegal(s: GameState, player: PlayerIndex, i: Intent): boolean {
@@ -138,62 +211,7 @@ function localOpsCandidates(s: GameState, player: PlayerIndex): Intent[] {
   const area = areaOf(s, player);
 
   // -- switch (§6.1)
-  for (const [trayId, tray] of s.trays) {
+  out.push(...switchCandidates(s, player));
-    if (tray.position.at !== 'grid' || tray.position.seat !== seatOf(s, player)) continue;
-    const from = tray.position.coord;
-    for (const reverse of [false, true]) {
-      const dests = destinationsFor(s, player, trayId, from, reverse);
-      // Grouped by destination square so `distinguishingVia` only ever compares routes that are
-      // actually racing for the same button — two routes to DIFFERENT squares need no `via` to
-      // tell apart, `to` already does that.
-      const byCoord = new Map<string, MoveDestination[]>();
-      for (const d of dests) {
-        const k = coordKey(d.coord);
-        (byCoord.get(k) ?? byCoord.set(k, []).get(k)!).push(d);
-      }
-      for (const group of byCoord.values()) {
-        for (const d of group) {
-          const via = group.length > 1 ? distinguishingVia(d, group) : undefined;
-          out.push({ type: 'switch.move', trayId, to: d.coord, reverse, ...(via ? { via } : {}) });
-        }
-      }
-    }
-    for (let n = 1; n <= tray.consist.length; n++) {
-      out.push({ type: 'switch.dropCars', trayId, count: n });
-      // Off the nose as well as the tail — the only way to get cars back off the front of a train
-      // that shoved a cut, and therefore the only way an engine buried mid-train reaches an end.
-      out.push({ type: 'switch.dropCars', trayId, count: n, fromNose: true });
-    }
-    // Small Yard: enumerating every permutation would explode, so offer the useful ones —
-    // bringing each car to the droppable end, plus a full reversal. `check` validates any order,
-    // so a UI may submit an arbitrary permutation.
-    const n = tray.consist.length;
-    if (n > 1) {
-      for (let k = 0; k < n; k++) {
-        const order = [...Array(n).keys()].filter((x) => x !== k);
-        order.push(k);
-        out.push({ type: 'switch.sortConsist', trayId, order });
-      }
-      out.push({ type: 'switch.sortConsist', trayId, order: [...Array(n).keys()].reverse() });
-    }
-  }
-  // Flying Switch — roll a cut into an ADJACENT industry without the engine entering it.
-  for (const cardId of s.decks.hands.get(player) ?? []) {
-    const k = s.cards.get(cardId)?.kind;
-    if (k?.kind !== 'maneuver' || k.key !== 'flyingSwitch') continue;
-    for (const [trayId, tray] of s.trays) {
-      if (tray.position.at !== 'grid' || tray.position.seat !== seatOf(s, player)) continue;
-      const from = tray.position.coord;
-      for (const reverse of [false, true]) {
-        for (const d of destinationsFor(s, player, trayId, from, reverse)) {
-          for (let count = 1; count <= tray.consist.length; count++) {
-            out.push({ type: 'maneuver.flyingSwitch', cardId, trayId, count, to: d.coord });
-          }
-        }
-      }
-    }
-  }
-  out.push({ type: 'switch.end' });
 
   // -- draw (§6.2)
   out.push({ type: 'draw.fromHomeOffice' });

src/engine/setup.ts

@@ -431,6 +431,7 @@ export function createGame(opts: SetupOptions): GameState {
     turns: freshTurns(playerCount, MOVES_PER_LOCAL_OPS),
     movedThisPhase: new Set(),
     collisionsToday: 0,
+    collisionsPrevDay: 0,
     collisionsTotal: 0,
     status: 'active',
     outcome: null,

src/engine/state.ts

@@ -1119,6 +1119,20 @@ export type GameState = {
   movedThisPhase: Set<TrayId>;
   /** §3.4 — resets at the start of each Day; checked against `config.maxCollisionsPerDay`. */
   collisionsToday: number;
+  /**
+   * What `collisionsToday` held for the Day that just ENDED — captured at the rollover, immediately
+   * before the reset.
+   *
+   * The Day-end dialog exists to report the Day that finished, and it is drawn from the frame AFTER
+   * the rollover, because that is the frame whose `day` went up. So it read `collisionsToday` as 0 no
+   * matter what had happened: Jesse, 2026-09-09, at the end of a Day 1 with two collisions in it —
+   * "it shows a total of two collisions, but zero today ... that does seem to be a contradiction".
+   *
+   * NOT DERIVABLE ON THE CLIENT. A Day turns over inside the phases that run themselves, so in
+   * multiplayer the push that reports the new Day is the same push that reports the reset — a client
+   * may never see the ended Day's final count to remember it.
+   */
+  collisionsPrevDay: number;
   /** §3.4 — never reset; checked against `config.maxCollisionsTotal`. */
   collisionsTotal: number;
   /**

src/engine/track.ts

@@ -377,7 +377,7 @@ export function reachableDestinations(
   start: GridCoord,
   initialExit: Port,
 ): MoveDestination[] {
-  return exploreMoves(ctx, start, initialExit).destinations;
+  return exploreMoves(ctx, start, initialExit, false).destinations;
 }
 
 /**
@@ -434,12 +434,19 @@ export function exploreMoves(
   ctx: MoveContext,
   start: GridCoord,
   initialExit: Port,
+  /**
+   * False when only the destinations are wanted (`reachableDestinations`, every legality check): the
+   * rejections are then not recorded at all. They never change a destination, and building them was
+   * pure allocation on the hottest path in the engine.
+   */
+  collectBlocks = true,
 ): { destinations: MoveDestination[]; blocked: MoveBlock[] } {
   const { area, occupancy } = ctx;
   const results: MoveDestination[] = [];
   const blocked: MoveBlock[] = [];
   const noted = new Set<string>();
   const block = (coord: GridCoord, kind: MoveBlockKind, why: string): void => {
+    if (!collectBlocks) return;
     const k = coordKey(coord);
     if (noted.has(k)) return;
     noted.add(k);
@@ -459,10 +466,25 @@ export function exploreMoves(
     couples: RollingStock[];
     /** Coord key each entry in `couples` came off, aligned by index — see `routeOutcomeKey`. */
     origins: string[];
-    /** Cards visited on THIS route, start included. A per-path set, not a global one — see the
+  };
-     * module doc comment on `MAX_ENUMERATED_FRONTIER` for why a global one would forbid the very
+
-     * routes this walk exists to find. */
+  /**
-    visited: Set<string>;
+   * Has THIS route already used `to`? Per-path, not global — see the doc comment on
+   * `MAX_ENUMERATED_FRONTIER` for why a global set would forbid the very routes this walk exists to
+   * find.
+   *
+   * Read off the route's own `path` instead of a Set copied at every step, which was a large share of
+   * the walk's garbage. It answers exactly as that Set did: the start square, then every square
+   * enqueued along the route AFTER the first hop, including this node's own — the first hop's square
+   * was never added, and `path[0]` is that square, so the scan begins at 1.
+   */
+  const onRoute = (node: Frontier, to: GridCoord): boolean => {
+    if (sameCoord(to, start)) return true;
+    if (node.path.length > 0 && sameCoord(to, node.coord)) return true;
+    for (let k = 1; k < node.path.length; k++) {
+      if (sameCoord(node.path[k]!.coord, to)) return true;
+    }
+    return false;
   };
 
   // The very first hop is checked here because `start`'s card is not itself enqueued; every later
@@ -493,13 +515,14 @@ export function exploreMoves(
       path: [],
       couples: ownCut,
       origins: ownCut.map(() => startKey),
-      visited: new Set([startKey]),
     },
   ];
   let enumerated = 1;
 
-  while (queue.length > 0) {
+  // FIFO by index rather than `shift()`, which re-packs the array on every pop. Same order.
-    const node = queue.shift()!;
+  let head = 0;
+  while (head < queue.length) {
+    const node = queue[head++]!;
     const card = cardAt(area, node.coord);
     if (!card) continue;
 
@@ -592,17 +615,15 @@ export function exploreMoves(
       // direction; it never says without repeating ground, but a train cannot occupy the same
       // track twice at once either). Per-path, not global — a DIFFERENT route may legitimately
       // pass through a card this one already used.
-      const toKey = coordKey(to);
+      if (onRoute(node, to)) continue;
-      if (node.visited.has(toKey)) continue;
       if (enumerated >= MAX_ENUMERATED_FRONTIER) break;
       enumerated++;
       const step: MoveStep = { coord: node.coord, entry: node.entry, exit };
-      const visited = new Set(node.visited);
+      queue.push({ coord: to, entry: opposite(exit), path: [...node.path, step], couples, origins });
-      visited.add(toKey);
-      queue.push({ coord: to, entry: opposite(exit), path: [...node.path, step], couples, origins, visited });
     }
   }
 
+  if (!collectBlocks) return { destinations: results, blocked };
   // A card that turned out to be reachable after all is not a blocker: the walk may meet a square
   // from a bad angle first and a good one later.
   const reached = new Set(results.map((r) => coordKey(r.coord)));

src/server/http.ts

@@ -656,6 +656,27 @@ export function startServer(opts: ServerOptions): void {
         return;
       }
 
+      /**
+       * THIS SEAT'S OWN GAME, AS A SAVE (playtest, 2026-09-15: "most of the time, I want to go ahead and
+       * just save it as a JSON file in my Downloads folder").
+       *
+       * The administrative export at `/api/games/<id>/save` is gated on the admin secret, which a player
+       * does not have and should not need: a save is the seed and the moves, and every one of those moves
+       * is already on this player's screen. So the seat's own session token is the gate, exactly as it is
+       * for `/api/stream` and `/api/intent` — it proves which game and which chair, and nothing else is
+       * disclosed. The page turns the JSON into a file (`main.ts`'s `downloadSave`).
+       */
+      if (url.pathname === '/api/save' && req.method === 'GET') {
+        const ps = sessions.get(url.searchParams.get('token') ?? '');
+        const session = ps ? games.get(ps.gameId) : undefined;
+        if (!ps || !session) {
+          sendJson(res, 404, { error: 'no such game' });
+          return;
+        }
+        sendJson(res, 200, { gameId: ps.gameId, save: session.exportSave() });
+        return;
+      }
+
       if (url.pathname === '/api/stream' && req.method === 'GET') {
         const token = url.searchParams.get('token') ?? '';
         const ps = sessions.get(token);

src/sim/board-svg.ts

@@ -42,6 +42,12 @@ export type DivisionRoster = {
   actor: number | null;
   /** The player this map is being drawn for. */
   viewer: number;
+  /**
+   * Division nodes to flash — a Mainline card that has just become a different card (Realignment).
+   * Playtest, 2026-09-15: the log said a card had been converted and the map said nothing, so the one
+   * play that changes the Division itself was invisible on the map of it.
+   */
+  flash?: readonly number[];
 };
 
 export function divisionSvg(nodes: DivisionView[], roster?: DivisionRoster | null): string {
@@ -134,6 +140,8 @@ export function divisionSvg(nodes: DivisionView[], roster?: DivisionRoster | nul
     }[];
     cap: number | null;
     tip: string;
+    /** Set on a card that has just changed under the players' feet — drawn with a brief pulse. */
+    flash?: boolean;
     /** Which SEAT's district this cell belongs to, or null for Mainline and Division Points. */
     seat: number | null;
     /** Set on an Office cell when a roster was supplied: whose district this is. */
@@ -168,7 +176,11 @@ export function divisionSvg(nodes: DivisionView[], roster?: DivisionRoster | nul
     cells.push({ ...c, x: 0, y: 0 });
   };
 
+  // The node's own index, so a cell can be matched against `roster.flash`. `continue` below skips the
+  // rest of the body, never this.
+  let nodeIndex = -1;
   for (const n of nodes) {
+    nodeIndex++;
     if (n.kind === 'office') {
       const cap = n.capacity;
       const ad = n.trains.flat();
@@ -261,6 +273,7 @@ export function divisionSvg(nodes: DivisionView[], roster?: DivisionRoster | nul
     push({
       kind: dp ? 'dp' : 'ml',
       label: n.label,
+      ...(roster?.flash?.includes(nodeIndex) ? { flash: true } : {}),
       sub: n.capacity === null
         ? 'no limit — trains queue'
         : [free, inYard.length > 0 ? `${inYard.length} in the yard` : ''].filter(Boolean).join(' · '),
@@ -356,7 +369,7 @@ export function divisionSvg(nodes: DivisionView[], roster?: DivisionRoster | nul
 
   cells.forEach((c) => {
     const full = c.cap !== null && c.trains.length >= c.cap;
-    out += `<g class="bs-dcell bs-d${c.kind}${full ? ' bs-full' : ''}" data-tip="${esc(c.tip)}">`;
+    out += `<g class="bs-dcell bs-d${c.kind}${full ? ' bs-full' : ''}${c.flash ? ' bs-changed' : ''}" data-tip="${esc(c.tip)}">`;
     out += `<rect x="${c.x}" y="${c.y}" width="${c.w}" height="${CH}" rx="5"/>`;
     /**
      * WHOSE IS IT, IS IT THEIR MOVE, AND IS IT MINE — answered by colour and one suffix rather
@@ -1248,6 +1261,12 @@ export const BOARD_CSS = `
    and leave at the other, and a seated layout must not be read as a ring. */
 .bs-stop line{stroke:#e0a060;stroke-width:2.6;stroke-linecap:round}
 .bs-end{fill:#e0a060;font:10px ui-monospace,monospace;letter-spacing:.03em}
+/* A card that has just BECOME a different card (Realignment). The same amber the rest of the page
+   spends on "it is happening here", pulsing only while the step that did it is on screen — so the
+   change is seen on the map rather than only read in the log. */
+.bs-dcell.bs-changed rect{stroke:#e0a060;stroke-width:2.4;animation:bs-changed-pulse 1.1s ease-in-out infinite}
+@keyframes bs-changed-pulse{0%,100%{stroke-opacity:1}50%{stroke-opacity:.35}}
+@media (prefers-reduced-motion: reduce){.bs-dcell.bs-changed rect{animation:none}}
 /* The vertical bars a Mainline card is divided into (§2.1). Drawn faint: they are the ruler the
    train is measured against, not something to look at instead of the train. */
 .bs-region{stroke:#4a5361;stroke-width:1.2;stroke-dasharray:3 3}
@@ -1329,7 +1348,10 @@ export const BOARD_CSS = `
 .bs-arrow{fill:#5f6b7a;font:10px ui-monospace,monospace}
 .bs-cn{fill:#e6e9ee;font:600 11px ui-monospace,monospace}
 .bs-coord{fill:#5f6b7a;font:9px ui-monospace,monospace}
-.bs-name{fill:#e6e9ee;font:600 11px ui-monospace,monospace}
+/* stroke:none (Gitea#24). A name takes the class \`bs-turn\` while it is that player's move, and \`.bs-turn\` is
+   also the turn ARROW's rule, which strokes its shape 2.4px grey. Declared after it, this keeps that
+   outline off the letters, which it smeared into an unreadable blur. */
+.bs-name{fill:#e6e9ee;stroke:none;font:600 11px ui-monospace,monospace}
 .bs-name.bs-you{fill:#5aa9e6}
 /* Their move — wins over .bs-you when both apply, because whose turn it is changes every few
    seconds and which railroad is yours never does.

src/sim/bot.ts

@@ -22,6 +22,9 @@
 import {
   applyIntent,
   areaOf,
+  extendLimitsIfNeeded,
+  isLockedOut,
+  protoCard,
   canAdvanceLoad,
   destinationsFor,
   facilityCarTypes,
@@ -29,14 +32,15 @@ import {
   ownCutFor,
 } from '../engine/apply.ts';
 import { MAX_CONSIST, nextOfficeTier, officeProfile } from '../engine/content.ts';
-import type { CarType, Hand, TrackGeometry } from '../engine/content.ts';
+import type { CarType, FreightKind, Hand, TrackGeometry } from '../engine/content.ts';
 import type { GameEvent } from '../engine/events.ts';
 import type { Intent } from '../engine/intents.ts';
 import { legalActions } from '../engine/legal.ts';
-import { connectionsFor, exitsFrom, facilityVariants, hasPort, joins, neighbour, opposite, variantsFor } from '../engine/track.ts';
+import { canPlaceAt, connectionsFor, exitsFrom, facilityVariants, hasPort, joins, neighbour, opposite, variantsFor } from '../engine/track.ts';
 import type { Port } from '../engine/track.ts';
 import { actingPlayer, coordKey, turnOf } from '../engine/state.ts';
 import type { Facility, GameState, GridCoord, OfficeArea, PlayerIndex, RollingStock, TrackCard } from '../engine/state.ts';
+import { planSwitchingTurn, switchFingerprint } from './switch-planner.ts';
 
 export type BotPolicy = {
   name: string;
@@ -106,7 +110,8 @@ function because(reason: string, intent: Intent): Intent {
  * Every flag here turns something OFF. That is the opposite of how this started — the tweaks were
  * candidates to switch on — and it is the right shape once a candidate has been adopted: what a
  * measured heuristic needs afterwards is a way to ask "is this still worth it?" when the deck or
- * the rules move under it. Both of these were worth about +1.5 revenue together when adopted; if a
+ * the rules move under it. The first two were worth about +1.5 revenue together when adopted, and
+ * planning the switching turn (`noPlanSwitching`) +2.89 on its own; if a
  * rebalance changes the economy, that is a claim to re-test rather than to assume.
  *
  * The candidates that did NOT survive are gone rather than left switched off: preferring coaches at
@@ -121,9 +126,78 @@ export type BotTweaks = {
   noTrainCap?: boolean;
   /** Draw whenever nothing is urgent, as the bot did before it preferred operating. */
   noOperateFirst?: boolean;
-
+  /**
+   * Choose switching Moves one at a time from the rule ladder, as the bot did before it planned the
+   * whole turn (`switch-planner.ts`). Measured at adoption, 2026-09-14: planning was worth
+   * +2.89 ± 0.18 revenue a game (t = 15.79) over 1600 paired seeds, 733 better against 21 worse.
+   */
+  noPlanSwitching?: boolean;
+  /**
+   * Take a face-up train or industry card whether or not it could be played, as the bot did before
+   * 2026-09-14. It then took 20.1 trains and 11.9 industries a game off the Departments and discarded
+   * 20.2 and 11.8, retaking the same card 28.8 times a game. Asking first measured +1.52 ± 0.10
+   * (t = 15.59) over 1600 paired seeds — this ablation was worse on 880 of them and better on 211.
+   */
+  noPlayableTakes?: boolean;
+  /**
+   * Choose where track goes by `bestTrackLay`'s piece rules and the fallback's first legal square, as the
+   * bot did before 2026-09-15, instead of by what the district can DO afterwards (`bestValuedLay`).
+   * Scoring the layout measured +0.118 ± 0.029 (t = 4.14) over 6400 paired seeds, and closed run-arounds
+   * in 22 of 60 districts against 9.
+   */
+  noValueLays?: boolean;
+  /**
+   * Let the New Train phase's fallback take `options[0]`, as the bot did before 2026-09-15. Because
+   * `legalActions` lists `newTrain.secondSection` ahead of the Extra starts, all 26 Second Sections the
+   * bot ran in 60 games were that accident, and 6 of the 20 collisions followed one. Taking a car, a pass
+   * or the Extra's start instead measured +0.32 ± 0.09 (t = 3.64) over 400 paired seeds.
+   */
+  noDeliberateNewTrain?: boolean;
 };
 
+/**
+ * A switching turn planned once and then played a step per decision.
+ *
+ * Keyed by the tweaks object, because that is what one policy owns — the server shares a single
+ * `developerBot` across every bot seat, so the plan inside it is kept per player. Each step is
+ * submitted only while the position still matches the fingerprint the plan expected there; anything
+ * else replans. A switching turn has no randomness, so in practice a plan is made once a turn.
+ */
+type ActivePlan = { steps: Intent[]; keys: string[]; next: number; summary: string };
+const activePlans = new WeakMap<BotTweaks, Map<PlayerIndex, ActivePlan>>();
+
+function plannedSwitch(s: GameState, player: PlayerIndex, options: Intent[], tweaks: BotTweaks): Intent | null {
+  let mine = activePlans.get(tweaks);
+  if (!mine) activePlans.set(tweaks, (mine = new Map()));
+  const here = switchFingerprint(s, player);
+  let active = mine.get(player);
+  if (!active || active.keys[active.next] !== here) {
+    const p = planSwitchingTurn(s, player);
+    active = {
+      steps: p.steps,
+      keys: p.keys,
+      next: 0,
+      summary:
+        `position ${p.rootScore.toFixed(2)} → ${p.score.toFixed(2)} over ${p.expanded} positions` +
+        (p.complete ? '' : ', search budget reached'),
+    };
+    mine.set(player, active);
+  }
+  if (active.next >= active.steps.length) {
+    mine.delete(player);
+    const end = options.find((i) => i.type === 'switch.end');
+    return end ? because(`planned switching turn complete — ${active.summary}`, end) : null;
+  }
+  const want = JSON.stringify(active.steps[active.next]);
+  const match = options.find((i) => JSON.stringify(i) === want);
+  if (!match) {
+    mine.delete(player);
+    return null;
+  }
+  active.next++;
+  return because(`step ${active.next} of ${active.steps.length} of a planned switching turn — ${active.summary}`, match);
+}
+
 /** The bot as it plays today. Every knob off. */
 export const developerBot: BotPolicy = makeDeveloperBot({});
 
@@ -209,6 +283,13 @@ export function makeDeveloperBot(tweaks: BotTweaks): BotPolicy {
         );
         if (match) return because(`the ${w.loaded ? 'loaded' : 'empty'} ${w.type} is what a facility is short of`, match);
       }
+      if (!tweaks.noDeliberateNewTrain) {
+        const move =
+          pickFirst(options, 'newTrain.placeCar', 'newTrain.passCar', 'newTrain.startExtra') ??
+          options.find((i) => i.type !== 'newTrain.secondSection' && i.type !== 'maneuver.redFlags') ??
+          options[0]!;
+        return because('no car on offer is one our facilities need', move);
+      }
       return because('no car on offer is one our facilities need', pickFirst(options, 'newTrain.placeCar', 'newTrain.passCar') ?? options[0]!);
     }
 
@@ -438,7 +519,7 @@ function topOfDepartment(s: GameState, slot: number): string | undefined {
  * In a competitive game the same call reads the other way round — burying a card a rival wants is an
  * attack — which is why the choice belongs to the discarding player and not to the rules.
  */
-function bestDiscard(s: GameState, player: PlayerIndex, options: Intent[]): Intent | null {
+function bestDiscard(s: GameState, player: PlayerIndex, options: Intent[], tweaks: BotTweaks): Intent | null {
   let best: Intent | null = null;
   let bestScore = -Infinity;
   for (const i of options) {
@@ -448,7 +529,7 @@ function bestDiscard(s: GameState, player: PlayerIndex, options: Intent[]): Inte
     // two showing whatever they happened to start with. Measured over 100 games — spreading 2.87
     // revenue, concentrating on the deepest 2.67, indifferent 2.67.
     const top = topOfDepartment(s, i.toSlot);
-    const wanted = isWorthTaking(s, player, i.toSlot);
+    const wanted = isWorthTaking(s, player, i.toSlot, tweaks);
     const depth = s.decks.departments[i.toSlot]?.length ?? 0;
     const score = (top === undefined ? 6 : wanted ? -10 : 2) - Math.min(depth, 4) * 0.5;
     if (score > bestScore) {
@@ -460,10 +541,39 @@ function bestDiscard(s: GameState, player: PlayerIndex, options: Intent[]): Inte
 }
 
 /** A face-up card worth spending the draw on rather than gambling on the deck. */
-function isWorthTaking(s: GameState, player: PlayerIndex, slot: number): boolean {
+function isWorthTaking(s: GameState, player: PlayerIndex, slot: number, tweaks: BotTweaks): boolean {
-  return takingRank(s, player, slot) > 0;
+  return takingRank(s, player, slot, tweaks) > 0;
 }
 
+/**
+ * Could an industry of this kind be laid anywhere right now? Asked of the engine's own placement
+ * rule (`canPlaceAt`) and lockout (`isLockedOut`) rather than a copy: an industry is plain east-west
+ * track, so the only squares worth asking about are empty ones east or west of a card already down.
+ */
+function industrySiteExists(s: GameState, player: PlayerIndex, kind: FreightKind): boolean {
+  const area = areaOf(s, player);
+  if (isLockedOut(area, kind)) return false;
+  const probe = {
+    geometry: { kind: 'facility', facility: kind },
+    baseOperationalRail: true,
+    standing: [],
+    standingWest: 0,
+    facility: null,
+    modifiers: [],
+    enhancements: [],
+  } as unknown as TrackCard;
+  for (const key of area.grid.keys()) {
+    const [row, col] = key.split(',').map(Number);
+    for (const dc of [1, -1]) {
+      const at = { row: row!, col: col! + dc };
+      if (at.row === area.runningRow || area.grid.has(coordKey(at))) continue;
+      if (canPlaceAt(area, at, probe)) return true;
+    }
+  }
+  return false;
+}
+
+
 /**
  * HOW BADLY the face-up card is wanted. 0 means not worth the draw.
  *
@@ -471,14 +581,18 @@ function isWorthTaking(s: GameState, player: PlayerIndex, slot: number): boolean
  * happened to be scanned first — a coin flip on the card that decides whether the district ever
  * becomes a Passenger Facility at all.
  */
-function takingRank(s: GameState, player: PlayerIndex, slot: number): number {
+function takingRank(s: GameState, player: PlayerIndex, slot: number, tweaks: BotTweaks): number {
   const id = topOfDepartment(s, slot);
   if (!id) return 0;
   const k = s.cards.get(id)?.kind;
   if (!k) return 0;
   if (k.kind === 'office') return nextOfficeTier(areaOf(s, player).tier) === k.tier ? 3 : 0;
-  if (k.kind === 'timetabledTrain' || k.kind === 'extraTrain') return 2;
+  if (k.kind === 'timetabledTrain' || k.kind === 'extraTrain') {
-  if (k.kind === 'freightFacility') return 1;
+    return !tweaks.noPlayableTakes && trainWouldOverfillTheOffice(s, player, tweaks) ? 0 : 2;
+  }
+  if (k.kind === 'freightFacility') {
+    return !tweaks.noPlayableTakes && !industrySiteExists(s, player, k.facility) ? 0 : 1;
+  }
   return 0;
 }
 
@@ -741,6 +855,104 @@ function bestFacilityPlay(s: GameState, player: PlayerIndex, options: Intent[]):
   return best;
 }
 
+/**
+ * WHAT A DISTRICT'S TRACK IS WORTH FOR WHAT IT LETS HAPPEN NEXT — the default since 2026-09-15;
+ * `noValueLays` turns it off.
+ *
+ * `bestTrackLay` scores the PIECE — its shape and where it sits — and cannot tell one that opens an
+ * industry site or closes a run-around from one that merely fills a square. This scores the LAYOUT the
+ * piece would leave, so a lay is worth the difference it makes. Every term is something the rules turn
+ * into play: a site is somewhere a held industry can go; a run-around lets a crew pass its own cars
+ * (§A.5); a way off the main is the only road to either; a Running Track straight is what Interlocking
+ * needs. The weights are a starting point to measure, not a result.
+ */
+function layoutValue(area: OfficeArea): number {
+  let v = 0;
+  const reachable = reachableOffMain(area);
+  v += Math.min(reachable.size, 12) * 0.2;
+
+  let ways = 0;
+  let loops = 0;
+  for (const side of SIDES) {
+    for (const col of waysOff(area, side)) {
+      ways++;
+      if (descendFrom(area, col, side).rejoins.size > 0) loops++;
+    }
+  }
+  v += [0, 1.5, 2, 2.5][Math.min(ways, 3)]!;
+  if (loops > 0) v += 6 + Math.min(loops - 1, 1) * 2;
+
+  // Squares an industry could legally be laid on, joined to track a crew can reach.
+  const probe = protoCard({ kind: 'freightFacility', facility: 'mineTipple' }, 0)!;
+  const tried = new Set<string>();
+  let sites = 0;
+  for (const key of reachable) {
+    const [row, col] = key.split(',').map(Number);
+    for (const dc of [1, -1]) {
+      const at = { row: row!, col: col! + dc };
+      const k = coordKey(at);
+      if (tried.has(k) || area.grid.has(k) || at.row === area.runningRow) continue;
+      tried.add(k);
+      if (canPlaceAt(area, at, probe)) sites++;
+    }
+  }
+  v += [0, 2, 3, 3.5][Math.min(sites, 3)]!;
+
+  let mainStraight = false;
+  for (const [key, card] of area.grid) {
+    if (Number(key.split(',')[0]) !== area.runningRow || card.geometry.kind !== 'track') continue;
+    if (card.geometry.geometry === 'straight') mainStraight = true;
+    // A turnout on the main whose leg joins nothing is a hole in the Running Track with no road behind it.
+    if (card.geometry.geometry === 'turnout') {
+      const col = Number(key.split(',')[1]);
+      for (const side of SIDES) {
+        if (!hasPort(card, legPort(side))) continue;
+        const beyond = area.grid.get(`${area.runningRow + side},${col}`);
+        if (!beyond || !joins(card, legPort(side), beyond)) v -= 0.5;
+      }
+    }
+  }
+  if (mainStraight) v += 1.5;
+  return v;
+}
+
+/**
+ * The track lay worth most by `layoutValue`, placed on a copy of the district exactly as the reducer
+ * places it (`protoCard`, `extendLimitsIfNeeded`). With `mustBuild`, only a lay that gains something is
+ * offered, which is the slot `bestTrackLay` fills; without it, the best of whatever is legal, which is
+ * the slot the "play what is in hand" fallback fills. Ties go to the square nearer the Office.
+ */
+function bestValuedLay(s: GameState, player: PlayerIndex, options: Intent[], mustBuild: boolean): Intent | null {
+  const area = areaOf(s, player);
+  const base = layoutValue(area);
+  let best: Intent | null = null;
+  let bestScore = -Infinity;
+  for (const i of options) {
+    if (i.type !== 'card.play' || i.placement === undefined) continue;
+    const kind = s.cards.get(i.cardId)?.kind;
+    if (kind?.kind !== 'track') continue;
+    const built = protoCard(kind, i.variant);
+    if (!built) continue;
+    const after: OfficeArea = {
+      ...area,
+      grid: new Map(area.grid),
+      limitsWest: { ...area.limitsWest },
+      limitsEast: { ...area.limitsEast },
+    };
+    after.grid.set(coordKey(i.placement), built);
+    extendLimitsIfNeeded(after, i.placement);
+    const gain = layoutValue(after) - base;
+    if (mustBuild && gain <= 0.1) continue;
+    const distance = Math.abs(i.placement.row - area.officeCoord.row) * 2 + Math.abs(i.placement.col - area.officeCoord.col);
+    const score = gain - distance * 0.01;
+    if (score > bestScore) {
+      bestScore = score;
+      best = i;
+    }
+  }
+  return best;
+}
+
 function bestTrackLay(s: GameState, player: PlayerIndex, options: Intent[]): Intent | null {
   const area = areaOf(s, player);
 
@@ -1213,7 +1425,7 @@ function followThrough(
       if (!turnOf(s, player).drawnThisTurn) {
         const piles = options.filter(
           (i): i is Extract<Intent, { type: 'draw.fromDepartment' }> =>
-            i.type === 'draw.fromDepartment' && isWorthTaking(s, player, i.slot),
+            i.type === 'draw.fromDepartment' && isWorthTaking(s, player, i.slot, tweaks),
         );
         // Best-ranked pile rather than the first that qualifies: an Office card and a train card
         // both "qualify", and only one of them stops the collisions.
@@ -1221,7 +1433,7 @@ function followThrough(
         // and a train card are face up together 1.6 decisions a game — but ranking them is what the
         // ranking function is for, and a coin flip on the card that decides whether the district
         // ever becomes a Passenger Facility is not worth keeping for its own sake.
-        const useful = piles.sort((a, b) => takingRank(s, player, b.slot) - takingRank(s, player, a.slot))[0];
+        const useful = piles.sort((a, b) => takingRank(s, player, b.slot, tweaks) - takingRank(s, player, a.slot, tweaks))[0];
         if (useful) return because('a face-up card is worth more than a blind draw right now', useful);
         const blind = options.find((i) => i.type === 'draw.fromHomeOffice');
         if (blind) return because('no face-up card is worth taking — gamble on the deck', blind);
@@ -1282,7 +1494,7 @@ function followThrough(
       // STRAIGHTS that Enhancements require, and no Freight Facility has anywhere to go until a
       // district exists. Measured with track absent, the hand held a playable Enhancement on 4,778
       // turns and could legally place one on 33.
-      const track = bestTrackLay(s, player, options);
+      const track = !tweaks.noValueLays ? bestValuedLay(s, player, options, true) : bestTrackLay(s, player, options);
       if (track) return because('lay track — nothing else creates the straights Enhancements need or the spurs freight needs', track);
 
       // Then real development: a card actually laid into the grid. Freight facilities are scored —
@@ -1307,17 +1519,27 @@ function followThrough(
           s.cards.get(i.cardId)?.kind.kind !== 'track',
       );
       if (placed) return because('develop the district with a card that goes on the board', placed);
-      const play = options.find((i) => i.type === 'card.play');
+      const play = !tweaks.noValueLays
+        ? options.find((i) => i.type === 'card.play' && s.cards.get(i.cardId)?.kind.kind !== 'track') ??
+          bestValuedLay(s, player, options, false)
+        : options.find((i) => i.type === 'card.play');
       if (play) return because('play what is in hand', play);
       const end = options.find((i) => i.type === 'draw.end');
       if (end) return because('nothing in hand can be played anywhere legal', end);
       return because(
         'nothing playable — discard onto the Department whose face-up card is least worth keeping reachable',
-        bestDiscard(s, player, options) ?? pickFirst(options, 'card.discard') ?? options[0]!,
+        bestDiscard(s, player, options, tweaks) ?? pickFirst(options, 'card.discard') ?? options[0]!,
       );
     }
 
     case 'switch': {
+      // The planner decides the whole turn; the rules below are its fallback if the position is ever
+      // not the one it planned for, and the whole of switching under `noPlanSwitching`.
+      if (!tweaks.noPlanSwitching) {
+        const planned = plannedSwitch(s, player, options, tweaks);
+        if (planned) return planned;
+      }
+
       /**
        * A MOVE THAT DRAGS THE CREW'S OWN CUT BACK ON IS A WASTED MOVE, so take those off the table
        * before any heuristic gets to choose one.

src/sim/compare.ts

@@ -23,6 +23,7 @@
  * Run with:
  *   node src/sim/compare.ts 1600 noTrainCap=1        — what the A/D cap is worth today
  *   node src/sim/compare.ts 1600 noOperateFirst=1    — what operating before drawing is worth
+ *   node src/sim/compare.ts 1600 noPlanSwitching=1   — what planning the switching turn is worth
  *
  * The flags are ABLATIONS: they turn off heuristics the bot already plays, so a negative delta is
  * the heuristic earning its place. That is what a measured bot needs going forward — the question
@@ -221,7 +222,7 @@ export function formatPaired(r: PairedResult): string {
  * against itself and report a confident zero, which is the most expensive way this tool could fail.
  */
 export const NUMERIC_TWEAKS = new Set<string>([]);
-export const BOOLEAN_TWEAKS = new Set(['noTrainCap', 'noOperateFirst']);
+export const BOOLEAN_TWEAKS = new Set(['noTrainCap', 'noOperateFirst', 'noPlanSwitching', 'noPlayableTakes', 'noValueLays', 'noDeliberateNewTrain']);
 
 export function parseTweaks(args: string[]): BotTweaks {
   const tweaks: Record<string, number | boolean> = {};

src/sim/narrate.ts

@@ -15,7 +15,7 @@
  * panel cannot drift from the rules.
  */
 
-import { MAX_CONSIST, crewTrayCount } from '../engine/content.ts';
+import { MAINLINE_PROFILES, MAX_CONSIST, crewTrayCount } from '../engine/content.ts';
 import { adTrackCount, coordKey, seatOf, turnOf } from '../engine/state.ts';
 import type { GameState, GridCoord, PlayerIndex, RollingStock, SeatIndex, TrayId } from '../engine/state.ts';
 import { areaOf, canAdvanceLoad, canBoard, canDetrain, canStartLoad, facilityCarType, facilityCarTypes, freightRuleSpentHere, isFreight, laborersLeft, movesFor, passengerRefusal, portersLeft } from '../engine/apply.ts';
@@ -134,7 +134,7 @@ export function narrate(e: GameEvent, ctx: NarrateContext = {}): Narration {
     case 'actorChanged':
       return {
         tone: 'quiet',
-        text: e.player === null ? 'No player acts — automatic phase' : `Player ${e.player} to act`,
+        text: e.player === null ? 'No player acts — automatic phase' : 'to act',
       };
 
     // -- local operations
@@ -211,13 +211,19 @@ export function narrate(e: GameEvent, ctx: NarrateContext = {}): Narration {
           ? `Played ${card(e.cardId)} onto ${at(e.placement)}`
           : `Played ${card(e.cardId)}`,
       };
-    case 'mainlineModified':
+    case 'mainlineModified': {
+      // WHICH CARD, NOT JUST WHICH WAY IT WENT. "Mainline card 3 converted to plains" left the reader
+      // to remember what card 3 had been (playtest, 2026-09-15), and the card it WAS is the half that
+      // says what the play was worth.
+      const kindName = (k: string | undefined): string =>
+        MAINLINE_PROFILES.find((m) => m.kind === k)?.name ?? k ?? 'that card';
       return {
         tone: 'plain',
         text: e.became
-          ? `Realignment: Mainline card ${e.node} converted to ${e.became}`
+          ? `Realignment: Mainline card ${e.node}, ${kindName(e.from)}, converted to ${kindName(e.became)}`
-          : `Played ${e.key} on Mainline card ${e.node}`,
+          : `Played ${e.key} on Mainline card ${e.node}${e.from ? ` (${kindName(e.from)})` : ''}`,
       };
+    }
     case 'redFlagSpent':
       return {
         tone: 'good',
@@ -225,8 +231,8 @@ export function narrate(e: GameEvent, ctx: NarrateContext = {}): Narration {
       };
     case 'redFlagRuled':
       return e.flag
-        ? { tone: 'plain', text: `Player ${e.player} flagged the approaching train` }
+        ? { tone: 'plain', text: 'Flagged the approaching train' }
-        : { tone: 'plain', text: `Player ${e.player} waved the train through` };
+        : { tone: 'plain', text: 'Waved the train through' };
     case 'redFlagsSet':
       return {
         tone: 'good',
@@ -496,13 +502,13 @@ export function narrate(e: GameEvent, ctx: NarrateContext = {}): Narration {
         ? { tone: 'bad', text: `${e.reason.toUpperCase()} · ${e.delta} Revenue (now ${e.total})` }
         : { tone: 'good', text: `+${e.delta} Revenue (now ${e.total}) — ${e.reason}` };
     case 'phaseEnded':
-      return { tone: 'quiet', text: `Player ${e.player} finished ${phaseLabel(e.phase)}` };
+      return { tone: 'quiet', text: `Finished ${phaseLabel(e.phase)}` };
 
     // -- §3.3, extended play (Gitea#11)
     case 'extensionVoted':
       return e.agree
-        ? { tone: 'plain', text: `Player ${e.player} would play one more Day` }
+        ? { tone: 'plain', text: 'Would play one more Day' }
-        : { tone: 'plain', text: `Player ${e.player} called time — the game ends here` };
+        : { tone: 'plain', text: 'Called time — the game ends here' };
     case 'dayExtended':
       return { tone: 'clock', text: `── The table plays on: Day ${e.day} is added to the timetable ──` };
     case 'playConcluded':
@@ -511,8 +517,8 @@ export function narrate(e: GameEvent, ctx: NarrateContext = {}): Narration {
     // -- §11, the Yard Office (Gitea#5)
     case 'yardOfficeRuled':
       return e.take
-        ? { tone: 'plain', text: `Player ${e.player} sent ${train(e.trainId)} into the Yard Office` }
+        ? { tone: 'plain', text: `Sent ${train(e.trainId)} into the Yard Office` }
-        : { tone: 'plain', text: `Player ${e.player} kept ${train(e.trainId)} at the Train Order Office` };
+        : { tone: 'plain', text: `Kept ${train(e.trainId)} at the Train Order Office` };
   }
 }
 

src/sim/pacing.ts

@@ -54,7 +54,7 @@ export const DWELL: Record<StepKind, number> = {
    *
    * WAS 250ms, WHICH WAS WRONG, and wrong in the way that mattered most: an early-game bot turn has
    * no switching in it at all, so it was six steps of 250ms and 0ms — **750ms for a whole turn**.
-   * Jesse, from the first real play on `phoenix.local`: *"bot play was way too fast. I briefly saw
+   * Jesse, from the first real play on the test server: *"bot play was way too fast. I briefly saw
    * that it was the bot's office area then their turn was done."* His instruction had been "start at
    * 1s and tune down", and that was applied only to switching while this number was invented.
    */
@@ -143,10 +143,27 @@ export function kindOf(cause: StepCause): StepKind {
  *
  * `pace` has no lower surprise — 0 means off — but an unbounded upper one does: `?pace=300` from
  * somebody typing 3.00, or a corrupt `localStorage` value, would give a switching move a five-minute
- * dwell and look exactly like a frozen board. Ten is far beyond any speed anyone would choose (2 and
+ * dwell and look exactly like a frozen board. Twenty is far past any speed anyone would choose and
- * 3 are the ones actually asked for) and well short of unusable.
+ * well short of unusable.
+ *
+ * RAISED FROM TEN 2026-09-10, because the ceiling turned out not to be theoretical: Jesse played at
+ * 10× — the top of the ladder — and reported it *"still a bit fast, but followable"*. A control whose
+ * slowest setting is not slow enough for the person using it has the wrong ceiling, not the right one
+ * held firmly.
  */
-export const MAX_PACE = 10;
+export const MAX_PACE = 20;
+
+/**
+ * The speeds the on-screen control offers, slowest last.
+ *
+ * `0` is off: every move is drawn at once, as it was before v0.8.0 — TODO #18's "a player who has
+ * seen it a hundred times will want it off". The ladder runs well past 1 because that is what the
+ * first real play asked for: Jesse reached for 7×, and although the `?pace=` he used never took
+ * effect (the splash replaces the query string, so the play page only ever saw `?lobby`), the wish
+ * was real. Watching a bot shunt cars is the point of this feature, and it is worth as long as it
+ * takes.
+ */
+export const PACE_LEVELS = [0, 0.5, 1, 2, 3, 5, 7, 10, 15, 20] as const;
 
 /**
  * How long to show one step, in ms, at a given speed.
@@ -160,6 +177,28 @@ export function dwellFor(cause: StepCause, pace = 1): number {
   return Math.round(DWELL[kindOf(cause)] * Math.min(MAX_PACE, Math.max(0, pace)));
 }
 
+/**
+ * How much of the speed control a PHASE gets — damped, not the full multiplier.
+ *
+ * Phases were pinned at their tabled beat in v0.8.0.3, because scaling them with everything else put
+ * a wall of clock-ticking after a player's own move. That was right about the cost and wrong about
+ * the need: at 10× the caption row goes past faster than the sentence on it can be read. Jesse,
+ * 2026-09-10: *"phases displayed on the upper line go by too quickly still. Should be 4 times as
+ * long — at a guess. Maybe use the speed multiplier for that too?"*
+ *
+ * So they scale, at a third of the rate. That lands exactly on his guess — 10× gives a phase four
+ * times its tabled beat — while leaving 1× untouched, and it stays affordable because phase beats
+ * cluster rather than accumulate: measured over 60 pushes, a push carries **1.0 phase beat on
+ * average and 4 at worst**, so the wait after a move goes to ~2.4s typical and ~10s at its very
+ * worst rather than the minutes a full multiplier would have cost.
+ *
+ * Below 1× it simply follows the multiplier: somebody asking for everything faster means the phases
+ * too.
+ */
+function phaseSpeed(pace: number): number {
+  return pace <= 1 ? pace : 1 + (pace - 1) / 3;
+}
+
 /**
  * How long to show one STEP — the form the queue actually uses.
  *
@@ -170,10 +209,25 @@ export function dwellFor(cause: StepCause, pace = 1): number {
  * have to import `DisplayStep` back from the module that imports `StepCause` from it.
  */
 export function dwellForStep(
-  step: { cause: StepCause; lines: readonly unknown[]; frame: { table: object } },
+  step: { cause: StepCause; player: number | null; lines: readonly unknown[]; frame: { table: object } },
   pace = 1,
 ): number {
-  if (step.lines.length > 0) return dwellFor(step.cause, pace);
+  // Off means off, for the clock as much as for anybody's move.
+  if (pace <= 0) return 0;
+  /**
+   * THE SPEED CONTROL IS ABOUT OTHER PEOPLE, NOT ABOUT THE CLOCK.
+   *
+   * A phase keeps its tabled beat at every speed. Measured over 40 turns of a real 3-seat game, the
+   * waiting split almost evenly — 21.0s of other players against 21.0s of phases turning over — so
+   * scaling both put 105 seconds of clock-ticking into a 5× game, all of it after the player's own
+   * move and none of it anything to watch. Jesse, from that game: *"after my turn, when I actually
+   * execute my turn, I'm still subject to that same delay before it moves on. That makes no sense."*
+   *
+   * The phase still gets its beat (TODO #18) — it just does not get longer because somebody wanted
+   * to watch a bot shunt cars.
+   */
+  const speed = step.player === null ? phaseSpeed(pace) : pace;
+  if (step.lines.length > 0) return dwellFor(step.cause, speed);
   /**
    * A SILENT STEP EARNS A BEAT ONLY WHEN THE CLOCK TURNED OVER — which is TODO #18 exactly: "give
    * every phase a visible beat", for New Train, the Mainline and the shift change.
@@ -182,12 +236,11 @@ export function dwellForStep(
    * silently killed #18: a phase can move trains without saying anything, and those steps were being
    * flashed past. "Anything that changed the board" is wrong the other way: `submit()` steps
    * `advance()` about 4.6 times per intent and most of those merely hand the turn on, so beating on
-   * all of them would cost a quarter of an hour a game. The phase turning over is the thing a player
+   * all of them would cost a quarter of an hour a game.
-   * is being shown, and there are about 180 of those in a full game.
    */
   const table = step.frame.table as Record<string, unknown>;
   const turned = 'phase' in table || 'phaseKey' in table || 'stage' in table || 'day' in table;
-  return turned ? dwellFor(step.cause, pace) : 0;
+  return turned ? dwellFor(step.cause, speed) : 0;
 }
 
 /**

src/sim/public-delta.ts

@@ -130,3 +130,65 @@ function need<T>(value: T | undefined, what: string): T {
   }
   return value;
 }
+
+/** A face-up or face-down pile a card can move to or from, as the display addresses it. */
+export type PileKey = 'home' | 'salvage' | `dept${number}`;
+
+/**
+ * WHICH PILES A STEP MOVED — derived, never sent.
+ *
+ * The receiver already holds the frame before a step and the frame after it, so which pile changed
+ * is a diff rather than something the wire has to carry. That matters twice over: nothing is added
+ * to the protocol, and it cannot drift out of step with the projection the way a hand-maintained
+ * hint would.
+ *
+ * WHY IT IS NEEDED AT ALL. A player watching somebody else draw a card sees seven seconds of an
+ * unchanged board — the step holds the screen, and the only thing that moved is a number in a panel
+ * they were not looking at. Jesse, playing v0.8.0.4 at 10×: *"many operations still occurred too fast
+ * for me to see"*, which was never about duration. Lighting the pile is what tells the eye where.
+ *
+ * WHAT EACH ACTION MOVES, measured across four seeds rather than reasoned about:
+ *
+ * | intent                  | piles                                                    |
+ * | ----------------------- | -------------------------------------------------------- |
+ * | `draw.fromHomeOffice`   | `home` — the COUNT only; the card itself stays private    |
+ * | `draw.fromDepartment`   | that `dept`, and `home` too when the pile refills from it |
+ * | `card.discard`          | that `dept`                                               |
+ * | `card.play`             | `salvage`, or nothing here when it lands on the board      |
+ * | switching, new trains   | nothing here — those show on the board itself             |
+ */
+/**
+ * Mainline cards that became a different card between two public boards — a Realignment, which is the
+ * one play that changes the Division itself.
+ *
+ * Playtest, 2026-09-15: *"is it possible to flash the mainline card when it gets changed by realignment?
+ * This would be more obvious to see what's happening on the map."* Detected the same way `changedPiles`
+ * detects a pile moving — by comparing the two boards the queue already holds — rather than by reading
+ * the event, so the flash lands with the step that shows it and not when the intent arrived.
+ */
+export function changedDivisionCards(before: PublicFrame | null, after: PublicFrame): number[] {
+  if (before === null) return [];
+  const out: number[] = [];
+  after.division.forEach((node, i) => {
+    const was = before.division[i];
+    if (was && was.kind === 'ml' && node.kind === 'ml' && was.label !== node.label) out.push(i);
+  });
+  return out;
+}
+
+export function changedPiles(before: PublicFrame | null, after: PublicFrame): PileKey[] {
+  if (before === null) return [];
+  const out: PileKey[] = [];
+  if (before.deck !== after.deck) out.push('home');
+  after.departmentDepth.forEach((depth, i) => {
+    // The TOP as well as the depth: taking the face-up card and replacing it leaves the count alone
+    // and changes the card everybody can see, which is the half that matters to a watcher.
+    if (before.departmentDepth[i] !== depth || before.departments[i] !== after.departments[i]) {
+      out.push(`dept${i}`);
+    }
+  });
+  if (before.salvage.depth !== after.salvage.depth || before.salvage.top !== after.salvage.top) {
+    out.push('salvage');
+  }
+  return out;
+}

src/sim/switch-planner.ts

@@ -0,0 +1,347 @@
+/**
+ * Component 17b — planning a whole switching turn before making the first Move.
+ *
+ * Dev-side, like the rest of the bot. The developer bot's switching branch chooses ONE move at a time
+ * from a ladder of rules, and its own comment names what that cannot do: "a strong player would use
+ * the six Moves to re-order the consist — that is the game's central switching puzzle, and this bot
+ * does not attempt it." This attempts it, for one turn at a time.
+ *
+ * WHY SEARCH IS FAIR HERE. A switching turn draws no card and rolls no die, so trying sequences on a
+ * copy of the game is exactly what a player does by looking at the board. The score below reads only
+ * what a player can see — the district, the cars on the trains, the facilities — and never the deck.
+ *
+ * WHY NOT EVERY SEQUENCE. Measured 2026-09-14 over 30 switching turns from bot games: a median turn
+ * reaches 229 distinct positions, but 11 of 30 passed 20,000, because setting cars out is free and a
+ * crew can leave them in a great many places. So the search keeps the best `beam` positions at each
+ * step and stops at `budget` positions tried. Small turns are searched completely inside that.
+ *
+ * THE SCORE IS OF WHERE THE TURN ENDS, not of what it did, and it starts from Jesse's ruling
+ * (2026-09-14): "players will attempt to deliver / pick up cars even if it delays trains." So a car
+ * put where it can be worked is worth a point, and a train left away from the Office costs a quarter
+ * of one. The weights are a starting point to measure, not a result.
+ */
+
+import { areaAtSeat, areaOf, commitEvents, facilityCarTypes, prepareIntent, withRouteCache } from '../engine/apply.ts';
+import { badlyMadeUp, isExpedited } from '../engine/advance.ts';
+import { MAX_CONSIST } from '../engine/content.ts';
+import type { Intent } from '../engine/intents.ts';
+import { legalSwitchingActions } from '../engine/legal.ts';
+import { cloneTally, coordKey, seatOf, turnOf } from '../engine/state.ts';
+import type { Facility, GameState, GridCoord, PlayerIndex, RollingStock, TrackCard } from '../engine/state.ts';
+
+export const SWITCH_WEIGHTS = {
+  /** A car standing where its industry can load or unload it — the point of switching. */
+  spot: 1.0,
+  /** The same, past what the industry's boxes can work at once. */
+  spotBeyondCapacity: 0.25,
+  /** A car the industry cannot work, taking room on its track. */
+  junkOnIndustry: -0.5,
+  /** A finished car — loaded at a shipper, emptied at a receiver — still waiting to be lifted. */
+  finishedLeft: -0.15,
+  /** A car on one of this district's trains that some industry here would work. */
+  carriedWanted: 0.35,
+  /** The same car left on ordinary track, where a later turn can fetch it. */
+  stagedWanted: 0.2,
+  /** A coach kept with its train, or parked at the Office where §A.4 allows it. */
+  coachWithTrain: 0.3,
+  /** A coach left anywhere else, where no Porter can work it. */
+  coachStranded: -0.3,
+  /** Anything but a coach standing on the Office square — the next arrival collides (§8.3). */
+  fouling: -3,
+  /** A train that ends the turn away from the Office and so cannot highball next Mainline Phase. */
+  trainAway: -0.25,
+  /** On top of that, an expedited train — Q3 charges a Revenue point every Phase it is away. */
+  expeditedAway: -1.0,
+  /** A train that could not leave even from the Office — engine buried, caboose mid-train (§8.2). */
+  notMadeUp: -0.6,
+  /** Tie-breaks, so equal outcomes prefer the plan that does less. */
+  perMove: -0.02,
+  perSetOut: -0.005,
+  /** A maneuver card spent — Flying Switch — so the planner plays one only when it buys something. */
+  cardSpent: -0.1,
+} as const;
+
+export type PlanOptions = {
+  budget: number;
+  beam: number;
+  /**
+   * Search Flying Switch alongside Moves, set-outs and sorts. On by default but UNMEASURED: the card
+   * is dealt 0 copies (Jesse, 2026-08-26), so over 400 paired seeds turning it on changed nothing —
+   * it is here so the planner can use the card the day it is dealt again.
+   */
+  flyingSwitch?: boolean;
+};
+/**
+ * Measured 2026-09-14, paired over 400 seeds against 3000/48: 2000/32 cost −0.02 ± 0.01 (t = −1.68,
+ * inside the noise) at half the time per turn; 1000/24 cost −0.06 ± 0.02 (t = −2.65) for little more.
+ */
+export const DEFAULT_PLAN: PlanOptions = { budget: 2000, beam: 32, flyingSwitch: true };
+
+export type SwitchPlan = {
+  /** The intents to submit, in order. Empty when nothing beats stopping where the crew stands. */
+  steps: Intent[];
+  /** `switchFingerprint` before each step, and after the last — so a caller can tell it is on plan. */
+  keys: string[];
+  rootScore: number;
+  score: number;
+  /** Positions tried. */
+  expanded: number;
+  /** False when the budget ran out before the search did. */
+  complete: boolean;
+};
+
+/**
+ * A copy of the game that a switching intent can be applied to without touching the original.
+ *
+ * NOT `structuredClone`, of the state or even of the district. A switching intent writes only the
+ * cars standing on cards, the industry tracks, the district's A/D and held lists, the consist and
+ * position of the trays standing in it, this player's turn and the tally — so exactly those arrays are
+ * copied and everything else is shared by reference. Measured 2026-09-14, deep-cloning the district
+ * was 44% of all planning time.
+ *
+ * `test/switch-planner.test.ts` proves across real games that planning leaves the original
+ * byte-identical — which is what fails first if a reducer ever starts writing somewhere new, or
+ * starts mutating a car or a card in place instead of replacing it.
+ */
+export function forkForSwitching(s: GameState, player: PlayerIndex): GameState {
+  const seat = seatOf(s, player);
+  const area = areaAtSeat(s, seat);
+  const grid = new Map<string, TrackCard>();
+  for (const [key, card] of area.grid) {
+    const f = card.facility;
+    grid.set(key, {
+      ...card,
+      standing: [...card.standing],
+      facility: f ? { ...f, industryTrack: { cars: [...f.industryTrack.cars] } } : f,
+    });
+  }
+  const officeAreas = new Map(s.officeAreas);
+  officeAreas.set(seat, {
+    ...area,
+    grid,
+    adOccupancy: [...area.adOccupancy],
+    heldAtLimits: [...area.heldAtLimits],
+    dispatchUsedToday: [...area.dispatchUsedToday],
+  });
+  const trays = new Map(s.trays);
+  for (const [id, t] of s.trays) {
+    if (t.position.at === 'grid' && t.position.seat === seat) trays.set(id, { ...t, consist: [...t.consist] });
+  }
+  const turns = new Map(s.turns);
+  const turn = s.turns.get(player)!;
+  turns.set(player, { ...turn, freightWorked: { ...turn.freightWorked } });
+  // Flying Switch spends its card (`spendCard`): the hand map is rewritten and the Salvage Yard grows.
+  const decks = { ...s.decks, hands: new Map(s.decks.hands), salvageYard: [...s.decks.salvageYard] };
+  return { ...s, officeAreas, trays, turns, decks, tally: cloneTally(s.tally) };
+}
+
+const carList = (xs: readonly RollingStock[]): string =>
+  xs.map((c) => `${c.type}${c.loaded ? '+' : '-'}${c.origin ?? ''}`).join(',');
+
+/**
+ * Everything a switching intent can change, as a string — two positions with the same fingerprint
+ * are the same position as far as the rest of the turn is concerned. Identical cars are not told
+ * apart, which is right: no intent names a car.
+ */
+export function switchFingerprint(s: GameState, player: PlayerIndex): string {
+  const seat = seatOf(s, player);
+  const parts: string[] = [];
+  for (const [id, t] of s.trays) {
+    if (t.position.at !== 'grid' || t.position.seat !== seat) continue;
+    const { row, col } = t.position.coord;
+    parts.push(`${id}@${row},${col}/${t.facing}/${t.railFacing ?? ''}/${t.engineAt}:${carList(t.consist)}`);
+  }
+  for (const [key, card] of areaOf(s, player).grid) {
+    const track = card.facility?.kind === 'freight' ? card.facility.industryTrack.cars : null;
+    if (card.standing.length === 0 && card.standingWest === 0 && (track?.length ?? 0) === 0) continue;
+    parts.push(`${key}=${carList(card.standing)}|${card.standingWest}|${track ? carList(track) : ''}`);
+  }
+  const turn = turnOf(s, player);
+  parts.push(`m${turn.movesRemaining}`, JSON.stringify(turn.freightWorked), `h${(s.decks.hands.get(player) ?? []).join(',')}`);
+  return parts.join(';');
+}
+
+/**
+ * §9.3 — an outbound industry loads EMPTY cars of its commodity, an inbound one unloads LOADED ones —
+ * but never a load that was made in this same district (v0.4.9e, `LOADED_IN_THIS_DISTRICT`).
+ */
+function works(f: Facility, c: RollingStock, seat: number): boolean {
+  if (f.kind !== 'freight' || !facilityCarTypes(f).includes(c.type)) return false;
+  return (!c.loaded && f.allows.outbound) || (c.loaded && f.allows.inbound && c.origin !== seat);
+}
+
+/**
+ * The car an industry has finished with. Only decidable at a one-way industry: at one that both
+ * ships and receives, a loaded car may be a delivery still waiting to be unloaded.
+ */
+function finished(f: Facility, c: RollingStock): boolean {
+  if (f.kind !== 'freight' || !facilityCarTypes(f).includes(c.type)) return false;
+  if (f.allows.outbound && !f.allows.inbound) return c.loaded;
+  if (f.allows.inbound && !f.allows.outbound) return !c.loaded;
+  return false;
+}
+
+const same = (a: GridCoord, b: GridCoord): boolean => a.row === b.row && a.col === b.col;
+
+/** How good this district's position is for the rest of the game, in rough Revenue points. */
+export function evaluateSwitching(s: GameState, player: PlayerIndex): number {
+  const W = SWITCH_WEIGHTS;
+  const area = areaOf(s, player);
+  const seat = seatOf(s, player);
+  const officeKey = coordKey(area.officeCoord);
+  const passengerOffice = area.grid.get(officeKey)?.facility?.kind === 'passenger';
+  let v = 0;
+
+  const withRoom: Facility[] = [];
+  for (const card of area.grid.values()) {
+    const f = card.facility;
+    if (!f || f.kind !== 'freight') continue;
+    if (f.industryTrack.cars.length < MAX_CONSIST) withRoom.push(f);
+    const cap = Math.max(1, f.capacity.outbound + f.capacity.inbound);
+    let working = 0;
+    for (const c of f.industryTrack.cars) {
+      if (works(f, c, seat)) v += ++working <= cap ? W.spot : W.spotBeyondCapacity;
+      else if (finished(f, c)) v += W.finishedLeft;
+      else v += W.junkOnIndustry;
+    }
+  }
+  const wanted = (c: RollingStock): boolean => withRoom.some((f) => works(f, c, seat));
+
+  for (const [key, card] of area.grid) {
+    if (card.facility?.kind === 'freight') continue;
+    const atOffice = key === officeKey;
+    for (const c of card.standing) {
+      if (c.type === 'coach') v += atOffice && passengerOffice ? W.coachWithTrain : W.coachStranded;
+      else if (atOffice) v += W.fouling;
+      else if (wanted(c)) v += W.stagedWanted;
+    }
+  }
+
+  for (const t of s.trays.values()) {
+    if (t.position.at !== 'grid' || t.position.seat !== seat) continue;
+    for (const c of t.consist) {
+      if (c.type === 'coach') v += passengerOffice ? W.coachWithTrain : 0;
+      else if (wanted(c)) v += W.carriedWanted;
+    }
+    if (t.trainNumber === null) continue;
+    if (!same(t.position.coord, area.officeCoord)) {
+      v += W.trainAway;
+      if (isExpedited(t)) v += W.expeditedAway;
+    }
+    if (badlyMadeUp(t)) v += W.notMadeUp;
+  }
+  return v;
+}
+
+/**
+ * For ORDERING the beam only, never for choosing the plan: a Move toward an industry changes nothing
+ * the score can see until the car is set out, so without this the beam would drop the approach in
+ * favour of positions that merely look tidy.
+ */
+function approach(s: GameState, player: PlayerIndex): number {
+  const area = areaOf(s, player);
+  const seat = seatOf(s, player);
+  const targets: { at: GridCoord; f: Facility }[] = [];
+  for (const [key, card] of area.grid) {
+    const f = card.facility;
+    if (!f || f.kind !== 'freight' || f.industryTrack.cars.length >= MAX_CONSIST) continue;
+    const [row, col] = key.split(',').map(Number);
+    targets.push({ at: { row: row!, col: col! }, f });
+  }
+  let bonus = 0;
+  for (const t of s.trays.values()) {
+    if (t.position.at !== 'grid' || t.position.seat !== seat) continue;
+    const here = t.position.coord;
+    for (const c of t.consist) {
+      let nearest = Infinity;
+      for (const { at, f } of targets) {
+        if (works(f, c, seat)) nearest = Math.min(nearest, Math.abs(at.row - here.row) + Math.abs(at.col - here.col));
+      }
+      if (nearest !== Infinity) bonus += 0.1 / (1 + nearest);
+    }
+  }
+  return bonus;
+}
+
+const SEARCHED = new Set<Intent['type']>(['switch.move', 'switch.dropCars', 'switch.sortConsist']);
+
+type Node = {
+  s: GameState;
+  steps: Intent[];
+  keys: string[];
+  moves: number;
+  setOuts: number;
+  cards: number;
+  score: number;
+  rank: number;
+};
+
+/** The best way found to spend what is left of this switching turn. Never mutates `s`. */
+export function planSwitchingTurn(
+  s: GameState,
+  player: PlayerIndex,
+  opts: PlanOptions = DEFAULT_PLAN,
+): SwitchPlan {
+  const W = SWITCH_WEIGHTS;
+  const scoreOf = (st: GameState, moves: number, setOuts: number, cards: number): number =>
+    evaluateSwitching(st, player) + moves * W.perMove + setOuts * W.perSetOut + cards * W.cardSpent;
+  const searched = (type: Intent['type']): boolean =>
+    SEARCHED.has(type) || (opts.flyingSwitch === true && type === 'maneuver.flyingSwitch');
+
+  const rootKey = switchFingerprint(s, player);
+  const rootScore = scoreOf(s, 0, 0, 0);
+  const root: Node = { s, steps: [], keys: [rootKey], moves: 0, setOuts: 0, cards: 0, score: rootScore, rank: rootScore };
+  let best = root;
+  const seen = new Set([rootKey]);
+  let frontier: Node[] = [root];
+  let expanded = 0;
+  let complete = true;
+
+  search: while (frontier.length > 0) {
+    const next: Node[] = [];
+    for (const node of frontier) {
+      const movesLeft = turnOf(node.s, player).movesRemaining;
+      // Every candidate is decided against THIS position, inside one route cache, and only then applied
+      // to its own copy: deciding on the copy would re-walk routes the listing had just walked.
+      const decided = withRouteCache(node.s, () =>
+        legalSwitchingActions(node.s, player)
+          .filter((i) => searched(i.type) && (i.type === 'switch.dropCars' || movesLeft >= 1))
+          .map((i) => ({ i, r: prepareIntent(node.s, player, i) })),
+      );
+      for (const { i, r } of decided) {
+        if (expanded >= opts.budget) {
+          complete = false;
+          break search;
+        }
+        expanded++;
+        if (!r.ok) continue;
+        const f = forkForSwitching(node.s, player);
+        commitEvents(f, r.events);
+        const key = switchFingerprint(f, player);
+        if (seen.has(key)) continue;
+        seen.add(key);
+        const setOut = i.type === 'switch.dropCars';
+        const moves = node.moves + (setOut ? 0 : 1);
+        const setOuts = node.setOuts + (setOut ? 1 : 0);
+        const cards = node.cards + (i.type === 'maneuver.flyingSwitch' ? 1 : 0);
+        const score = scoreOf(f, moves, setOuts, cards);
+        const child: Node = {
+          s: f,
+          steps: [...node.steps, i],
+          keys: [...node.keys, key],
+          moves,
+          setOuts,
+          cards,
+          score,
+          rank: score + approach(f, player),
+        };
+        if (score > best.score + 1e-9) best = child;
+        next.push(child);
+      }
+    }
+    // A stable sort, so equal ranks keep `legalActions` order and the bot stays deterministic.
+    frontier = next.length > opts.beam ? next.sort((a, b) => b.rank - a.rank).slice(0, opts.beam) : next;
+  }
+
+  return { steps: best.steps, keys: best.keys, rootScore, score: best.score, expanded, complete };
+}

src/sim/view.ts

@@ -437,6 +437,8 @@ export type Frame = {
   maxCollisionsPerDay: number;
   maxCollisionsTotal: number;
   collisionsToday: number;
+  /** What the Day that just ended finished on — see `collisionsPrevDay` in `engine/state.ts`. */
+  collisionsPrevDay: number;
   collisionsTotal: number;
   status: GameState['status'];
   outcome: GameState['outcome'];
@@ -1594,6 +1596,7 @@ export function projectSharedTable(s: GameState) {
     maxCollisionsPerDay: s.config.maxCollisionsPerDay,
     maxCollisionsTotal: s.config.maxCollisionsTotal,
     collisionsToday: s.collisionsToday,
+    collisionsPrevDay: s.collisionsPrevDay,
     collisionsTotal: s.collisionsTotal,
     status: s.status,
     outcome: s.outcome,

src/web/game.ts

@@ -1255,9 +1255,22 @@ function record(game: Game, events: GameEvent[], actor: PlayerIndex | null = nul
     const said = blindDraw ? 'Drew a card from the Home Office deck' : n.text;
     // "Chose to DRAW a card" does not say WHO, which is unreadable the moment there is more than
     // one seat. Only events the player caused are attributed; the Division running itself is not.
+    /**
+     * A RULING IS MADE AS SUPERINTENDENT, NOT AS YOURSELF (playtest, 2026-09-15: "maybe it could say
+     * 'Superintendent Player Tom', so it's clear they got the move because they're Superintendent").
+     * These three are the only moves a player makes out of turn, by holding the office: §8.1's
+     * clearance, §11's Yard Office offer and §Q's Red Flag prompt. `clearanceGiven` carries no
+     * player at all — the office made it, whoever holds it — so the actor is what names it.
+     */
+    const RULINGS = ['clearanceGiven', 'yardOfficeRuled', 'redFlagRuled'];
+    const ruling = RULINGS.includes(e.type) && who !== null;
     const mine = who !== null && 'player' in e;
-    const text = mine ? `Player ${who} ${uncapitalise(said)}` : said;
+    const text = ruling
-    game.log.push({ text, tone: mine ? 'act' : n.tone });
+      ? `Superintendent Player ${who} ${uncapitalise(said)}`
+      : mine
+        ? `Player ${who} ${uncapitalise(said)}`
+        : said;
+    game.log.push({ text, tone: mine || ruling ? 'act' : n.tone });
 
   }
   game.cues.push(...cuesFor(events));

src/web/main.ts

@@ -25,7 +25,8 @@ import type { LocalSession, Session } from './session.ts';
 import { createLocalSession, createRemoteSession } from './session.ts';
 import type { PlayerIndex } from '../engine/state.ts';
 import type { PublicDistrict } from '../sim/view.ts';
-import { createStepQueue } from './step-queue.ts';
+import { actorOnScreen, createStepQueue } from './step-queue.ts';
+import { PACE_LEVELS } from '../sim/pacing.ts';
 import { notice, prefillCode, runLobby } from './lobby.ts';
 import type { LobbyReady } from './lobby.ts';
 import {
@@ -53,6 +54,7 @@ const REMOTE_KEY = 'station-master.remote.v1';
 /** Preset board zoom levels — a fraction applied to the rendered SVG's own pixel dimensions. */
 const ZOOM_LEVELS = [0.75, 1, 1.25, 1.5] as const;
 
+
 /**
  * Small persisted preferences, kept in a `localStorage` key of their own — separate from
  * `SAVE_KEY`. A save is the seed plus the intents and has to stay portable; none of this belongs
@@ -182,6 +184,20 @@ function drainIntoQueue(): void {
   const reset = session.takeDisplayReset();
   if (reset) stepQueue.reset(reset);
   stepQueue.push(session.takeDisplaySteps());
+  /**
+   * NOWHERE TO ANIMATE MEANS DO NOT QUEUE AT ALL.
+   *
+   * Without `requestAnimationFrame` nothing ever advances the queue, so `busy()` would stay true for
+   * good — and since "Your Move" is now put away while the board is catching up, that would hide a
+   * player's own actions permanently, leaving Skip as the only way to play the game. Drawing
+   * everything at once is exactly what `pace = 0` does deliberately, so that is the honest fallback
+   * rather than a broken page. Caught by `test/web.test.ts`, whose DOM stub has no `rAF` — the same
+   * stub that has been proving this page still starts since long before any of this existed.
+   */
+  if (typeof requestAnimationFrame !== 'function') {
+    stepQueue.skip();
+    return;
+  }
   if (stepQueue.busy()) startAnimationLoop();
 }
 
@@ -199,17 +215,23 @@ function drainIntoQueue(): void {
  * drawn — from `PublicDistrict`, which `officeSvg` can render as-is because it takes board data and
  * has never needed a private viewer.
  */
-function renderWatching(): void {
+function renderWatching(f?: Frame): void {
   const behind = stepQueue.behind();
   const row = $('watching');
-  // Collapsed whenever the board is level with the game — which in solitaire is nearly always, and
+  /**
-  // between turns in multiplayer too. A row that is always there would be a row nobody reads.
+   * VISIBLE WHILE THE BOARD IS BEHIND **OR** STILL SHOWING SOMETHING.
-  if (behind === 0) {
+   *
+   * It used to hide the moment `behind` hit zero — which is the moment the LAST step of a burst goes
+   * up, so the one step a player was most likely to be reading about lost its caption. Collapsed
+   * otherwise: in solitaire that is nearly always, and between turns in multiplayer too, and a row
+   * that is always there is a row nobody reads.
+   */
+  if (behind === 0 && !stepQueue.busy()) {
     row.hidden = true;
     return;
   }
   row.hidden = false;
-  $('watching-behind').textContent = `${behind} behind`;
+  $('watching-behind').textContent = behind === 0 ? 'catching up' : `${behind} behind`;
   /**
    * THE CAPTION IS #15, and this is where that item lands rather than as a line of its own.
    *
@@ -218,8 +240,29 @@ function renderWatching(): void {
    * The queue IS that, so the caption simply names the step being shown, and the counter beside it
    * says how much of the wait is left.
    */
+  /**
+   * WHO, THEN WHAT — Jesse, 2026-09-09: *"it didn't tell me what the actual action was, like who I
+   * was waiting on or what they were doing. I knew I was behind, but I wasn't sure what I was
+   * supposed to be looking for."*
+   *
+   * The caption was there; it was the wrong half of the sentence. Half the waiting is automatic
+   * phases, whose narration reads "Mainline" — accurate, and no answer at all to "who am I waiting
+   * on". So the name goes first, and a phase says so in as many words rather than leaving the reader
+   * to infer that nobody is acting.
+   *
+   * The narrated line is used as it stands otherwise, because `record()` already prefixes it with the
+   * player — "Player Bot 1 moved Train 3 (−1,−2) → (−1,1)" — so a second name would stutter.
+   */
   const showing = stepQueue.showing();
-  $('watching-what').textContent = showing?.lines[0]?.text ?? '';
+  const said = showing?.lines[0]?.text ?? '';
+  const who =
+    showing === null || showing === undefined
+      ? ''
+      : showing.player === null
+        ? 'The Division'
+        : (f?.players[showing.player]?.name ?? `Seat ${seatLabel(showing.player)}`);
+  // A player action already names its actor; a phase does not, so it is introduced.
+  $('watching-what').textContent = showing?.player === null && said !== '' ? `${who}: ${said}` : said;
   /**
    * SKIP COSTS THE ANIMATION AND NEVER THE INFORMATION.
    *
@@ -287,12 +330,25 @@ function startAnimationLoop(): void {
        */
       console.error('display queue stopped:', err);
       animating = false;
+      // Do not strand the player behind a queue that can no longer advance: jump the board to the
+      // live position, which brings "Your Move" back with it.
+      try {
+        stepQueue.skip();
+      } catch {
+        /* nothing further to try — the authoritative Frame is still what the rest of the page draws */
+      }
+      render();
       return;
     }
     if (!stepQueue.busy()) {
       animating = false;
-      // One last render so the "N behind" row collapses the moment the board is level.
+      /**
-      renderWatching();
+       * A FULL RENDER, not just the row. The board being level again is what brings "Your Move"
+       * back and clears the last lit pile, so redrawing only the catching-up row would leave the
+       * action list hidden until something else happened to trigger a render — which, when the game
+       * is waiting on this player, is nothing at all.
+       */
+      render();
       return;
     }
     requestAnimationFrame(tick);
@@ -437,12 +493,14 @@ function piecePreview(links: string[], label: string): string {
  * are in the Day the same way and with the same violet highlight. It used to live here alone.
  */
 function renderTurnChart(f: Frame): void {
-  const actorName = f.actor === null ? null : (f.players[f.actor]?.name ?? null);
+  // The move on screen, not the live one, while the board is still catching up (Gitea#25).
+  const { actor, replaying } = actorOnScreen(stepQueue, f.actor);
+  const actorName = actor === null ? null : (f.players[actor]?.name ?? null);
   // Named only at a table with more than one seat: in solitaire the Fedora is always yours, and a
   // chip that can never change is a chip to read past.
   const superName =
     f.players.length > 1 ? (f.players.find((p) => p.index === f.superintendent)?.name ?? null) : null;
-  $('turnchart').innerHTML = turnChartHtml(f, actorName, superName);
+  $('turnchart').innerHTML = turnChartHtml(replaying ? { ...f, awaiting: null } : f, actorName, superName);
 }
 
 /**
@@ -944,6 +1002,7 @@ function beginRemote(ready: LobbyReady, rejoining = false): void {
   // banner (`#presence`), and it holds a beat so the game visibly begins.
   openHandoff();
   session = createRemoteSession(ready.token, ready.seat, abandonRemote);
+  remoteToken = ready.token;
   rejoiningRemote = rejoining;
   applyCapabilities();
   // A LocalSession has data the instant it is constructed; a RemoteSession does not — its first
@@ -1111,6 +1170,14 @@ function start(): void {
  * the lobby's job. Hidden rather than disabled: a greyed-out Undo in a multiplayer game invites the
  * question "why not?" every turn, and the honest answer is that the control does not belong there.
  */
+/**
+ * The session token of a server-backed game, or null in solitaire (playtest, 2026-09-15: "most of the
+ * time, I want to go ahead and just save it as a JSON file"). It is the seat's proof of identity to
+ * `/api/save`, exactly as it is to `/api/stream` — a save is the seed and the moves, every one of which
+ * is already on this player's screen.
+ */
+let remoteToken: string | null = null;
+
 function applyCapabilities(): void {
   const c = session.capabilities;
   const hide = (id: string, on: boolean): void => {
@@ -1118,7 +1185,7 @@ function applyCapabilities(): void {
     if (el) el.hidden = !on;
   };
   hide('undo', c.undo);
-  hide('savefile', c.saveLocal);
+  hide('savefile', c.saveLocal || remoteToken !== null);
   hide('newgame', c.newGame);
   // Creating or joining ANOTHER multiplayer game from inside a running one is not a thing this
   // page offers — same reasoning as `newgame`, and the same capability answers both.
@@ -1262,7 +1329,7 @@ function render(): void {
 
   renderTurnChart(f);
   renderPresence(f);
-  renderWatching();
+  renderWatching(f);
   $('revenue').textContent = String(f.revenue);
   /**
    * THE OBJECTIVE, WITHOUT THE COMMENTARY.
@@ -1291,8 +1358,10 @@ function render(): void {
   // -- division
   $('division').innerHTML = divisionSvg(f.division, {
     players: f.players,
-    actor: f.actor,
+    actor: actorOnScreen(stepQueue, f.actor).actor,
     viewer: f.viewer,
+    // A Realignment changes the Division under everyone; flashed only while the step that did it is up.
+    flash: stepQueue.busy() ? stepQueue.flashing() : [],
   });
   renderSeatingChain(f);
   applyZoom($('division'));
@@ -1482,7 +1551,9 @@ function render(): void {
    * reach. Drawn like the hand so they read as cards, dashed and unlit because taking one is a draw
    * action rather than a click on the card itself.
    */
-  $('depts').innerHTML = pilesHtml(f);
+  // The pile the move being WATCHED just touched, lit for as long as that step is on screen. Empty
+  // whenever the board is level with the game, or when the move was this player's own.
+  $('depts').innerHTML = pilesHtml(f, stepQueue.busy() ? stepQueue.lit() : []);
 
   renderYards(f);
 
@@ -1575,7 +1646,16 @@ function render(): void {
 
   // -- log
   const log = $('log');
-  const allLines = session.lines();
+  /**
+   * THE LOG IS HELD BACK WITH THE BOARD (playtest, 2026-09-15).
+   *
+   * A push carries its narration and its display steps together, so every line of a bot's turn was in
+   * this panel before the board had drawn a single move of it — the history ran ahead of the "N behind"
+   * counter it is meant to match. Those lines are the TAIL of the log, so exactly the ones belonging to
+   * steps still queued are withheld, and each appears as its step goes up.
+   */
+  const heldBack = stepQueue.pendingLines();
+  const allLines = heldBack > 0 ? session.lines().slice(0, -heldBack) : session.lines();
   const shownLines = allLines.slice(-60);
   /**
    * WHERE THE GAME BEGAN. In a multiplayer game the bots move the instant the host presses Start, so
@@ -1956,6 +2036,29 @@ function renderActions(
     renderEnding(el, f);
     return;
   }
+
+  /**
+   * YOUR MOVE IS PUT AWAY WHILE THE BOARD IS CATCHING UP — Jesse, 2026-09-10: *"your actions should
+   * be hidden while catching up."*
+   *
+   * Two reasons, and the second is the one that changed my mind about it. The board on screen is
+   * behind the game, so a move offered here is a move against a position that has already moved on —
+   * the menu is computed from the CURRENT state and would be acted on while looking at an older one.
+   * And the display had grown to four things demanding attention at once — the district, the history,
+   * the catching-up row and now a lit pile — which is what made the pile highlight so easy to miss.
+   * Taking the action list out of that competition while there is nothing to decide anyway is the
+   * cheapest way to quieten it.
+   *
+   * NOT A BLOCK. Skip is one click away and sits at the left of the row, so the wait is always
+   * voluntary; this replaces the buttons with the reason they are gone, rather than leaving a live
+   * menu over a stale board.
+   */
+  if (stepQueue.busy()) {
+    el.innerHTML =
+      '<div class="dim">Catching up on what everyone else did — your move is here when the board is ' +
+      'level with the game. <b>Skip</b> jumps straight to it.</div>';
+    return;
+  }
   // The game is running, so the next ending — an extended Day's, or a fresh game's — is entitled to
   // put its results up unasked again (Gitea#11).
   resultsShown = false;
@@ -2236,21 +2339,40 @@ function renderActions(
  * hundred bytes, so a finished game can be emailed or dropped on the site's replay directory —
  * where a rendered page would have been megabytes.
  */
-function downloadSave(): void {
+function writeFile(name: string, data: string): void {
-  // The button this fires from is hidden by `applyCapabilities()` for any session that cannot save
-  // (`#savefile`), but nothing stops this function being called directly, so the guard is repeated
-  // here rather than only trusted to the DOM.
-  if (!isLocal(session)) return;
-  const data = JSON.stringify(session.save(), null, 1);
   const blob = new Blob([data], { type: 'application/json' });
   const url = URL.createObjectURL(blob);
   const a = document.createElement('a');
   a.href = url;
-  a.download = `station-master-seed${session.seed()}-day${session.view().day}.json`;
+  a.download = name;
   a.click();
   URL.revokeObjectURL(url);
 }
 
+async function downloadSave(): Promise<void> {
+  const f = session.view();
+  const stamp = `day${f.day}-stage${f.stage}`;
+  /**
+   * A SERVER-BACKED GAME HAS NO LOCAL SAVE TO HAND OVER, so it asks the server for its own — the seat's
+   * token is the gate (`/api/save`), the same one the stream and every intent already use. The StartOS
+   * Manage Game action cannot do this: an action result is text only, with no file member in the SDK.
+   */
+  if (!isLocal(session)) {
+    if (remoteToken === null) return;
+    try {
+      const res = await fetch(`/api/save?token=${encodeURIComponent(remoteToken)}`);
+      if (!res.ok) return;
+      const body = (await res.json()) as { save: unknown };
+      writeFile(`station-master-${stamp}.json`, JSON.stringify(body.save, null, 1));
+    } catch {
+      // Offline, or the game has been ended under us: the button simply does nothing, which is the
+      // same thing every other server call on this page does when the server is not there.
+    }
+    return;
+  }
+  writeFile(`station-master-seed${session.seed()}-${stamp}.json`, JSON.stringify(session.save(), null, 1));
+}
+
 function save(): void {
   if (!isLocal(session)) return;
   try {
@@ -2286,7 +2408,7 @@ document.head.appendChild(pageStyle);
 installTooltips();
 
 const saveBtn = document.getElementById('savefile');
-if (saveBtn) saveBtn.onclick = downloadSave;
+if (saveBtn) saveBtn.onclick = () => void downloadSave();
 
 /**
  * Forget the saved game and deal a fresh one.
@@ -2603,6 +2725,52 @@ function runSolitaireSetup(params: URLSearchParams, hasSave = false, live: Frame
   dealBtn.onclick = () => commitNewGame(ss, seedField?.value ?? '');
 }
 
+/**
+ * PLAYBACK SPEED — v0.8.0.3, TODO #13.
+ *
+ * Persisted per viewer in `Settings`, so it survives the navigation that was eating `?pace=`. The
+ * queue reads `settings.pace` through a closure on every step, so a change here takes effect on the
+ * very next move rather than the next game.
+ */
+const paceSlowerBtn = document.getElementById('paceslower') as HTMLButtonElement | null;
+const paceFasterBtn = document.getElementById('pacefaster') as HTMLButtonElement | null;
+const paceLabel = document.getElementById('pacelabel');
+if (paceSlowerBtn && paceFasterBtn && paceLabel) {
+  const nearestPace = (): number => {
+    // A saved or URL value need not be on the ladder — `?pace=7` and a hand-edited setting are both
+    // legitimate — so the buttons step from whichever preset is closest rather than refusing to move.
+    const want = PACE_OVERRIDE ?? settings.pace;
+    return PACE_LEVELS.reduce((best, p) => (Math.abs(p - want) < Math.abs(best - want) ? p : best), PACE_LEVELS[0]);
+  };
+  const paintPace = (): void => {
+    const p = PACE_OVERRIDE ?? settings.pace;
+    paceLabel.textContent = p === 0 ? 'off' : `${p}×`;
+    const i = PACE_LEVELS.indexOf(nearestPace() as (typeof PACE_LEVELS)[number]);
+    paceSlowerBtn.disabled = i >= PACE_LEVELS.length - 1;
+    paceFasterBtn.disabled = i <= 0;
+    // A `?pace=` in the URL wins over the setting, so say so rather than showing dead buttons.
+    if (PACE_OVERRIDE !== null) {
+      paceSlowerBtn.disabled = true;
+      paceFasterBtn.disabled = true;
+      paceLabel.textContent = `${PACE_OVERRIDE}× (URL)`;
+    }
+  };
+  const stepPace = (by: number): void => {
+    const i = PACE_LEVELS.indexOf(nearestPace() as (typeof PACE_LEVELS)[number]);
+    const next = PACE_LEVELS[Math.min(PACE_LEVELS.length - 1, Math.max(0, i + by))];
+    if (next === undefined) return;
+    saveSettings({ pace: next });
+    paintPace();
+    // The row's countdown is measured in steps that will dwell, so a change to 0 empties it at once.
+    renderWatching();
+  };
+  // Slower is a BIGGER multiplier, so "−" walks up the ladder. Labelled by what it does to the game,
+  // not to the number: a player pressing "slower" wants to watch for longer.
+  paceSlowerBtn.onclick = () => stepPace(1);
+  paceFasterBtn.onclick = () => stepPace(-1);
+  paintPace();
+}
+
 const zoomOutBtn = document.getElementById('zoomout') as HTMLButtonElement | null;
 const zoomInBtn = document.getElementById('zoomin') as HTMLButtonElement | null;
 const zoomLabel = document.getElementById('zoomlabel');

src/web/panels.ts

@@ -52,25 +52,61 @@ export function handHtml(f: Frame, canPlay: (boolean | null)[] = []): string {
  * Only the top card may ever be drawn, so the depth is a count and not a hint: everything below it
  * is out of reach, and choosing where to discard is choosing what to put there.
  */
-export function pilesHtml(f: Frame): string {
+export function pilesHtml(f: Frame, lit: readonly string[] = []): string {
-  const pile = (label: string, top: string, depth: number, why: string, extra = '', slot = -1): string => {
+  const pile = (
+    key: string,
+    label: string,
+    top: string,
+    depth: number,
+    why: string,
+    extra = '',
+    slot = -1,
+    faceDown = false,
+  ): string => {
     const tip = [why, extra].filter(Boolean).join(' · ');
     // A Department is a DROP TARGET for a discard. The attribute is always emitted; only the play
     // page binds a click to it, and only while a card is waiting to be discarded — so the replay
     // viewer draws exactly the same markup and nothing there is clickable.
     const target = slot >= 0 ? ` data-dept="${slot}"` : '';
+    // `lit` marks the pile the move being watched just touched — see `changedPiles`.
+    const cls = `handcard${faceDown ? ' facedown' : ''}${lit.includes(key) ? ' pilelit' : ''}`;
     return (
-      `<div class="handcard"${target}${tip ? ` data-tip="${esc(tip)}"` : ''} tabindex="0">` +
+      `<div class="${cls}"${target}${tip ? ` data-tip="${esc(tip)}"` : ''} tabindex="0">` +
       `<div class="pilehd"><span>${esc(label)}</span><span class="depth">${depth}</span></div>` +
       `<b>${esc(top)}</b></div>`
     );
   };
   return (
+    /**
+     * THE HOME OFFICE DECK, which the screen had never drawn.
+     *
+     * `f.deck` has carried the face-down count since the Frame existed and nothing read it — the
+     * exact shape of display gap `test/display-gaps.test.ts` was written to sweep for, surviving in
+     * the panel that draws every OTHER pile. Asked for by Jesse 2026-09-10 for a second reason: a
+     * player drawing from it is the commonest move nobody can see, so it needs somewhere to flash.
+     *
+     * FIRST, because that is the order a card travels: out of here, into a hand, then onto a
+     * Department or the Salvage Yard. Face down, so the card slot says so rather than naming a card
+     * — the whole point of this pile is that nobody knows what is on top.
+     */
+    pile(
+      'home',
+      'Home Office',
+      'face down',
+      f.deck,
+      'The draw deck. Face down — nobody sees what is on top, and a card drawn from here is private ' +
+        'to whoever drew it. When it runs out, the Salvage Yard and the Departments are swept back ' +
+        'into it.',
+      '',
+      -1,
+      true,
+    ) +
     f.departments
       .map((d, i) => {
         const depth = f.departmentDepth[i] ?? 0;
         const under = depth - 1;
         return pile(
+          `dept${i}`,
           `Dept ${i + 1}`,
           d,
           depth,
@@ -81,6 +117,7 @@ export function pilesHtml(f: Frame): string {
       })
       .join('') +
     pile(
+      'salvage',
       'Salvage',
       f.salvage.top,
       f.salvage.depth,
@@ -180,7 +217,7 @@ export function dayEndHtml(f: Frame): string {
     ahead +
     standingsHtml(f) +
     targetHtml(f) +
-    collisionsHtml(f)
+    collisionsHtml(f, ended)
   );
 }
 
@@ -238,13 +275,28 @@ function targetHtml(f: Frame): string {
  * its config and enforces neither, so reporting a collision budget there would put a rule on
  * screen that this game does not have.
  */
-function collisionsHtml(f: Frame): string {
+function collisionsHtml(f: Frame, endedDay?: number): string {
   const scoredOnCollisions =
     (f.mode === 'competitive' || f.mode === 'coop') &&
     (f.maxCollisionsTotal > 0 || f.maxCollisionsPerDay > 0);
-  return scoredOnCollisions
+  if (!scoredOnCollisions) return '';
-    ? `<p>Collisions: <b>${f.collisionsToday}</b> today, <b>${f.collisionsTotal}</b> in all.</p>`
+  /**
-    : '';
+   * "TODAY" IS THE WRONG WORD IN A DAY-END DIALOG, and it read as a contradiction.
+   *
+   * That dialog is drawn from the frame whose `day` went UP — which is the same frame in which
+   * `collisionsToday` was reset — so it reported 0 however many there had been. Jesse, 2026-09-09,
+   * at the end of a Day 1 with two collisions in it: "it shows a total of two collisions, but zero
+   * today ... that does seem to be a contradiction."
+   *
+   * So when the caller knows which Day just ended it says so by name, and reads the count captured at
+   * the rollover. The end-of-game results screen passes nothing and keeps "today", where the Day has
+   * not turned over and the word is accurate.
+   */
+  const [count, when] =
+    endedDay === undefined
+      ? [f.collisionsToday, 'today']
+      : [f.collisionsPrevDay, `on Day ${endedDay}`];
+  return `<p>Collisions: <b>${count}</b> ${when}, <b>${f.collisionsTotal}</b> in all.</p>`;
 }
 
 /**
@@ -661,6 +713,30 @@ h3{font-size:11px;text-transform:uppercase;letter-spacing:.07em;color:#8b94a3;ma
 .handcard:focus{outline:2px solid #4d6fa8;outline-offset:1px}
 .cardrow.ref .handcard{background:#1c2129;border-style:dashed;border-color:#39424e;color:#b6bec9}
 .handcard.unplayable{color:#7d8794;border-color:#39424e}
+/* THE HOME OFFICE DECK. Face down, so its card slot names no card — it says so instead, in the
+   dimmed voice the rest of the panel uses for "nothing to read here". */
+.handcard.facedown > b{color:#6f7885;font-style:italic;font-weight:400}
+/* THE PILE A WATCHED MOVE JUST TOUCHED (v0.8.1).
+   A STATE, NOT A FLASH, and that is the whole point. The .tt-slot.fresh rule above animates for a fixed
+   1.5s, which is right for a die roll nobody is waiting on — but a step can hold the screen for
+   seven seconds at 10x, so a fixed animation would be over long before the pause it belongs to and
+   the player would be back to staring at an unchanged board. The flash-in marks the moment; the lit
+   border and background stay for exactly as long as the step is up, because the class is on the
+   element only while that step is the one being shown. */
+.handcard.pilelit{border-color:#8fd6a0;background:#1d3327;box-shadow:0 0 0 2px #2f6b47,0 0 14px rgba(143,214,160,.55);
+  animation:pilepulse 1.15s ease-in-out infinite}
+/* A PULSE FOR THE WHOLE DWELL, not one flash at the start. Measured: at 10x a pile stays lit for
+   just under seven seconds, so the highlight was never brief — but a single 0.45s flash-in and a
+   dark green fill were easy to miss entirely while watching the district. Jesse: "caught one flash
+   deck light up for just a very brief moment, but couldn't see that with what bot was doing in
+   office area and history and catch up area all at same time." Something still moving keeps drawing
+   the eye for as long as the move is up; a state that settles stops asking to be looked at. */
+@keyframes pilepulse{0%,100%{background:#1d3327;box-shadow:0 0 0 2px #2f6b47,0 0 14px rgba(143,214,160,.45)}
+  50%{background:#2f6b47;box-shadow:0 0 0 3px #8fd6a0,0 0 22px rgba(143,214,160,.85)}}
+/* Motion is the point here, so the reduced-motion fallback has to be loud in a different way rather
+   than simply not moving: a solid ring and a brighter fill, held. */
+@media(prefers-reduced-motion:reduce){
+  .handcard.pilelit{animation:none;background:#2f6b47;box-shadow:0 0 0 3px #8fd6a0}}
 .handcard.unplayable::after{content:"";position:absolute;inset:0;border-radius:5px;pointer-events:none;
   background:repeating-linear-gradient(45deg,transparent 0 5px,rgba(150,160,175,.20) 5px 6px)}
 /* THE CARD JUST DRAWN. It sits first in the row, and this says which one that is — three cards that

src/web/play.html

@@ -125,6 +125,7 @@ section{background:var(--panel);border:1px solid var(--line);border-radius:7px;
 .wbehind{font-variant-numeric:tabular-nums;font-weight:700;color:#c9cee0;
   background:#22263a;border:1px solid #343a52;border-radius:10px;padding:1px 8px;white-space:nowrap}
 #watching-skip{font-size:11px;padding:2px 10px;border-color:#e0b060;color:#e0b060;flex:none}
+#watching-who{color:#c9cee0;font-weight:700}
 #presence:empty{display:none}
 /* division strip */
 #division{display:flex;gap:7px;overflow-x:auto;padding-bottom:4px}
@@ -872,6 +873,14 @@ ul.blocked li{padding:2px 0}
   <span class="zoom" title="Zoom the Division map and your Office Area. Both already scroll — this only changes their size.">
     <button id="zoomout" aria-label="Zoom out">−</button><span id="zoomlabel">100%</span><button id="zoomin" aria-label="Zoom in">+</button>
   </span>
+  <!-- HOW FAST OTHER PLAYERS' TURNS PLAY BACK — v0.8.0.3, TODO #13.
+       A CONTROL RATHER THAN ONLY A URL PARAMETER. `?pace=` shipped first and is unreachable through
+       the front door: `index.html`'s two doors are `play.html?lobby` and `play.html?solitaire`, so
+       arriving from the splash REPLACES the query string and any pace with it. Jesse played a whole
+       game believing he was at 7x when he was at 1x. -->
+  <span class="zoom" title="How long another player's or a bot's move is held on screen before the next one. Yours are never delayed. Off draws every move at once, as it did before v0.8.0.">
+    <button id="paceslower" aria-label="Slower playback">−</button><span id="pacelabel">1×</span><button id="pacefaster" aria-label="Faster playback">+</button>
+  </span>
   <button id="undo" title="Take the last action back. The save is the seed plus the moves made, so this replays the game without the last one — as far back as you like.">Undo</button>
   <button id="savefile" title="Download this game as a save file you can replay or share">Save replay</button>
   <button id="newgame" title="Set up a fresh game — the seed, the table, the opening hand and what the three economies pay. Opens the same screen a new solitaire game starts from, with your current rules filled in; your game in progress is kept until you press Deal, and Continue puts it straight back.">New game</button>
@@ -906,9 +915,12 @@ ul.blocked li{padding:2px 0}
      and Skip. Empty and collapsed whenever the board is level with the game, which in solitaire is
      almost always. -->
 <div id="watching" hidden>
+  <!-- SKIP FIRST, on the left. It sat on the far right and a player's eye is on the countdown, not at
+       the other end of the row — Jesse, 2026-09-09: "the skip button should be on the far left, in
+       front of where it says [the count], so it's always close to where people are looking." -->
+  <button id="watching-skip" class="ghost" type="button" title="Stop animating and jump the board to where the game actually is. Nothing is lost — every line is already in the History panel.">Skip</button>
   <span id="watching-behind" class="wbehind"></span>
   <span id="watching-what"></span>
-  <button id="watching-skip" class="ghost" type="button" title="Stop animating and jump the board to where the game actually is. Nothing is lost — every line is already in the History panel.">Skip</button>
 </div>
 
 <main>

src/web/splash.ts

@@ -40,6 +40,29 @@ if (heroImage && lightbox) {
  * other way costs a click and a lobby that says it cannot reach a server — which is legible, and
  * recoverable. So a slow or flaky probe leaves the door alone; only a definite answer closes it.
  */
+/**
+ * CARRY `?pace=` THROUGH THE DOORS — v0.8.0.3.
+ *
+ * Both doors are static hrefs that REPLACE the query string (`play.html?lobby`,
+ * `play.html?solitaire`), so a `pace` typed on this page was silently dropped on the way in: Jesse
+ * played a whole game believing he was at 7× when the play page had only ever seen `?lobby`. The
+ * durable answer is the speed control on the play screen, which persists per viewer — this keeps the
+ * URL lever honest for handing two playtesters different speeds, which is the only thing it was ever
+ * for.
+ */
+try {
+  const pace = new URLSearchParams(location.search).get('pace');
+  if (pace !== null) {
+    for (const door of Array.from(document.querySelectorAll('a.door'))) {
+      const href = door.getAttribute('href');
+      // Only the doors into the game, and only ones that have not been disabled above.
+      if (href?.startsWith('./play.html?')) door.setAttribute('href', `${href}&pace=${encodeURIComponent(pace)}`);
+    }
+  }
+} catch {
+  // A door that keeps its own href is the status quo, not a broken page.
+}
+
 const mpDoor = document.getElementById('door-multiplayer');
 if (mpDoor) {
   const close = (): void => {

src/web/step-queue.ts

@@ -19,7 +19,8 @@
 
 import type { PublicFrame } from '../sim/view.ts';
 import type { DisplayStep } from '../sim/display-step.ts';
-import { applyPublicDelta } from '../sim/public-delta.ts';
+import { applyPublicDelta, changedDivisionCards, changedPiles } from '../sim/public-delta.ts';
+import type { PileKey } from '../sim/public-delta.ts';
 import { dwellForStep } from '../sim/pacing.ts';
 
 export type StepQueue = {
@@ -43,10 +44,52 @@ export type StepQueue = {
   behind(): number;
   /** The last step actually shown, for the caption line (#15). Null before anything has been shown. */
   showing(): DisplayStep | null;
+  /**
+   * The piles the step now on screen moved, for the display to light.
+   *
+   * Here because this is the only place that holds both the frame before a step and the frame after
+   * it — deriving it anywhere else would mean keeping a second copy of the board in step.
+   */
+  lit(): readonly PileKey[];
   /** True while there is anything left to show. */
   busy(): boolean;
+  /**
+   * How many narrated lines belong to steps NOT yet shown.
+   *
+   * The log and the board are two different moments while the queue is behind: a push carries its
+   * narration and its steps together, so every line of a bot's turn is in the history panel before the
+   * board has drawn a single move of it (playtest, 2026-09-15: *"is it possible to stall history so it
+   * stays in sync with the number behind?"*). Those lines are the TAIL of the log — they arrived last —
+   * so the caller holds back exactly this many and reveals each as its step goes up.
+   */
+  pendingLines(): number;
+  /** Division nodes whose card changed in the step now on screen, for the map to flash. */
+  flashing(): readonly number[];
 };
 
+/**
+ * WHOSE MOVE THE SCREEN IS SHOWING (Gitea#25).
+ *
+ * The game and the board on screen are two different moments. The server plays every bot move the
+ * instant a human's turn ends (`driveBots`), so the LIVE game is nearly always waiting on the human —
+ * while this queue is still replaying the bots, step by step. The turn chart and the Division map's
+ * move marker read the live actor, so a table of one person and three bots said "waiting on" that
+ * person throughout, against a playback row naming the bot actually moving.
+ *
+ * While the queue is behind or still showing a step, the answer is that step's player — `null` for an
+ * automatic phase, which is "the Division is running itself". Otherwise it is the live actor, and
+ * `replaying` is false so a caller can keep live-only detail, such as a ruling the game is waiting on,
+ * off a screen that has not caught up with it yet.
+ */
+export function actorOnScreen(
+  queue: Pick<StepQueue, 'behind' | 'busy' | 'showing'>,
+  live: number | null,
+): { actor: number | null; replaying: boolean } {
+  if (queue.behind() === 0 && !queue.busy()) return { actor: live, replaying: false };
+  const shown = queue.showing();
+  return shown === null ? { actor: live, replaying: false } : { actor: shown.player, replaying: true };
+}
+
 /**
  * `pace` is read on every step rather than captured, so changing the setting takes effect at once.
  *
@@ -65,6 +108,8 @@ export function createStepQueue(
 ): StepQueue {
   let shown: PublicFrame | null = null;
   let last: DisplayStep | null = null;
+  let litPiles: readonly PileKey[] = [];
+  let flashedCards: readonly number[] = [];
   let pending: DisplayStep[] = [];
   /** When the step now on screen is due to give way. Null when nothing is waiting. */
   let dueAt: number | null = null;
@@ -75,8 +120,17 @@ export function createStepQueue(
 
   /** Applies one step to the displayed board. A step's delta chains off the previous step's frame. */
   const show = (step: DisplayStep): void => {
+    const before = shown;
     shown = applyPublicDelta(shown, step.frame);
     last = step;
+    /**
+     * NOT FOR YOUR OWN MOVES. You drew that card; you do not need the deck flashed at you. Same rule
+     * that gives your own steps no dwell — the display is for watching everybody else.
+     */
+    litPiles = step.player !== null && step.player === viewer() ? [] : changedPiles(before, shown);
+    // A Realignment changes the Division under everyone, so it is flashed for the player who did it
+    // too — unlike a pile, which only tells the drawer what they already know.
+    flashedCards = changedDivisionCards(before, shown);
   };
 
   return {
@@ -84,6 +138,9 @@ export function createStepQueue(
       shown = frame;
       pending = [];
       dueAt = null;
+      // Nothing was watched arriving at this board, so nothing on it is lit.
+      litPiles = [];
+      flashedCards = [];
       // `last` deliberately survives: a reconnect should not blank the caption line, and the
       // sentence describing the most recent action is still true.
     },
@@ -136,6 +193,7 @@ export function createStepQueue(
     current: () => shown,
     behind: () => pending.filter((s) => dwell(s) > 0).length,
     showing: () => last,
+    lit: () => litPiles,
     /**
      * STILL SHOWING SOMETHING, not just still holding something back.
      *
@@ -147,6 +205,8 @@ export function createStepQueue(
      * `dueAt` is non-null exactly while the step on screen has time left, so the two together mean
      * "there is more to come, or what is up has not had its moment yet".
      */
+    pendingLines: () => pending.reduce((n, s) => n + s.lines.length, 0),
+    flashing: () => flashedCards,
     busy: () => pending.length > 0 || dueAt !== null,
   };
 }

test/advance.test.ts

@@ -1141,7 +1141,12 @@ describe('the history says WHY a train moved, and says it truthfully', () => {
 
     // A train ahead of it in the same Subdivision, running the SAME way — §8.1's fourth condition,
     // which is the Superintendent's call rather than an absolute bar.
-    const ahead = s.division.nodes.findIndex((n) => n.kind === 'mainline');
+    //
+    // AHEAD MEANS EAST OF THE OFFICE for this eastbound train. This used to take the FIRST Mainline card
+    // in the Division, which is west of the Office — behind the train — and still expected a ruling,
+    // which is exactly the fault Gitea#26 reported. The card is now one the train would actually follow.
+    const office = s.division.nodes.findIndex((n) => n.kind === 'office' && n.seat === 0);
+    const ahead = s.division.nodes.findIndex((n, i) => i > office && n.kind === 'mainline');
     const node = s.division.nodes[ahead];
     assert.equal(node?.kind, 'mainline');
     s.trays.set('ahead', {
@@ -1511,3 +1516,69 @@ describe('an Extra starts where the player puts it (Gitea#4)', () => {
     assert.equal(check(s, 0, at), 'NO_EXTRA_PENDING');
   });
 });
+
+// ---------------------------------------------------------------------------
+
+describe('§8.1 counts only trains AHEAD of the one departing (Gitea#26)', () => {
+  /**
+   * REPORTED from playtesting v0.8.0.9: two westbound Extras, X15 at an Office and X18 still crossing
+   * the card to its EAST. The Superintendent was asked to rule on X15 against X18 — a train behind it —
+   * and holding X15 kept the Whistle Post's only A/D track full, so X18 arrived into it and was
+   * destroyed. Reproduced by replaying the exported save; the positions below are that situation in a
+   * one-seat Division, where every Office is a Whistle Post and the Subdivision spans them all.
+   */
+  const setup = (occupant: { direction: 'east' | 'west'; side: 'east' | 'west'; number: number }) => {
+    const s = game(7, { days: 5 });
+    const area = areaOf(s, 0);
+    const office = s.division.nodes.findIndex((n) => n.kind === 'office' && n.seat === 0);
+    s.trays.set('departing', {
+      id: 'departing', trainNumber: 15, trainIsExtra: true, engineAt: 0, consist: [],
+      direction: 'west', facing: 'w',
+      position: { at: 'grid', seat: 0, coord: area.officeCoord }, movesUsed: 0,
+    });
+    area.adOccupancy.push('departing');
+    const card = s.division.nodes.findIndex((n, i) =>
+      n.kind === 'mainline' && (occupant.side === 'east' ? i > office : i < office));
+    const node = s.division.nodes[card];
+    assert.equal(node?.kind, 'mainline');
+    s.trays.set('other', {
+      id: 'other', trainNumber: occupant.number, trainIsExtra: true, engineAt: 0, consist: [],
+      direction: occupant.direction, facing: occupant.direction === 'east' ? 'e' : 'w',
+      position: { at: 'mainline', index: card }, movesUsed: 0,
+    });
+    if (node?.kind === 'mainline') {
+      node.transits.push({ tray: 'other', stagesRemaining: 2, stagesTotal: 2, direction: occupant.direction });
+    }
+    s.clock.phase = 'mainline';
+    return s;
+  };
+
+  it('does not put a same-direction train BEHIND the departing one to the Superintendent', () => {
+    const s = setup({ direction: 'west', side: 'east', number: 18 });
+    const r = advance(s);
+    assert.ok(!r.events.some((e) => e.type === 'clearanceRequested'), 'a train behind was put to the Superintendent');
+    assert.ok(
+      r.events.some((e) => e.type === 'trainHighballed' && e.trainNumber === 15),
+      'the departing train did not highball with nothing ahead of it',
+    );
+    assert.ok(!r.events.some((e) => e.type === 'trainsDestroyed'), 'a train was destroyed');
+  });
+
+  it('does not bar a departure over an opposite-direction train BEHIND it, which is moving away', () => {
+    const s = setup({ direction: 'east', side: 'east', number: 18 });
+    const r = advance(s);
+    assert.ok(
+      r.events.some((e) => e.type === 'trainHighballed' && e.trainNumber === 15),
+      'a train moving away behind it held the departure',
+    );
+  });
+
+  it('still puts a same-direction train AHEAD to the Superintendent', () => {
+    const s = setup({ direction: 'west', side: 'west', number: 18 });
+    const r = advance(s);
+    assert.ok(
+      r.events.some((e) => e.type === 'clearanceRequested' && e.trainId === 'departing'),
+      'a train the departing one would follow was not put to the Superintendent',
+    );
+  });
+});

test/apply.test.ts

@@ -159,6 +159,60 @@ describe('Local Operations: drawing (§6.2)', () => {
     assert.notEqual(s.decks.departments[1]![0], target, 'refilled with the same card');
   });
 
+  it('a PLAYED timetabled train never comes back, but a discarded one does — Gitea#23', () => {
+    /**
+     * Jesse's ruling, 2026-09-10: *"Once you've played a regularly scheduled train and it's in the
+     * salvage deck, that train is already on the timetable. It does not make sense to put that back
+     * into a reshuffled home deck to get played again. By contrast, a regularly scheduled train
+     * that's in a discard pile could potentially get reused later, and so should have that
+     * capability. Extras run one time and then they're done — if they are in the Salvage deck, they
+     * should get shuffled back in so that they could get run again."*
+     *
+     * So the test is WHERE the card is, not only what it is: the same card is spent in the Salvage
+     * Yard and still runnable in a Department. That is what this pins, because it is the kind of rule
+     * a later tidy-up would happily "simplify" into filtering by card kind everywhere.
+     */
+    const s = game();
+    const kindOfCard = (id: string): string => s.cards.get(id)?.kind.kind ?? '?';
+    const pool = [...s.decks.homeOffice];
+    const trains = pool.filter((id) => kindOfCard(id) === 'timetabledTrain');
+    const extras = pool.filter((id) => kindOfCard(id) === 'extraTrain');
+    const others = pool.filter((id) => !['timetabledTrain', 'extraTrain'].includes(kindOfCard(id)));
+    assert.ok(trains.length >= 2 && extras.length >= 1 && others.length >= 5, 'the deal lacks the cards this needs');
+
+    const spentTrain = trains[0]!;      // played: in the Salvage Yard, its slot taken
+    const discardedTrain = trains[1]!;  // never played: sitting in a Department
+    const playedExtra = extras[0]!;     // a single run, free to run again
+
+    s.decks.salvageYard = [spentTrain, playedExtra, ...others.slice(0, 3)];
+    s.decks.departments = [[discardedTrain], [others[3]!], [others[4]!]];
+    s.decks.homeOffice = [others[5]!];
+
+    applyIntent(s, 0, { type: 'localOps.choose', option: 'draw' });
+    const r = applyIntent(s, 0, { type: 'draw.fromHomeOffice' });
+    assert.ok(r.ok);
+    assert.ok(r.events.some((e) => e.type === 'deckReshuffled'), 'no reshuffle was emitted');
+
+    const recovered = new Set([...s.decks.homeOffice, ...s.decks.departments.flat()]);
+    const hands = new Set([...s.decks.hands.values()].flat());
+
+    // THE RULING, both halves.
+    assert.ok(!recovered.has(spentTrain), 'a played timetabled train was shuffled back in');
+    assert.ok(!hands.has(spentTrain), 'a played timetabled train was dealt back into a hand');
+    assert.ok(
+      s.decks.salvageYard.includes(spentTrain),
+      'a played timetabled train should stay in the Salvage Yard, not vanish',
+    );
+    assert.ok(
+      recovered.has(discardedTrain) || hands.has(discardedTrain),
+      'a DISCARDED timetabled train must come back — it was never played, so its slot is open',
+    );
+    assert.ok(
+      recovered.has(playedExtra) || hands.has(playedExtra),
+      'a played Extra must come back — an Extra is one run, not a standing slot',
+    );
+  });
+
   it('reshuffles the Salvage Yard and Departments back in when the deck runs out', () => {
     // §6.2 — "If drawing a card has depleted the Home Office deck, immediately collect all cards
     // from the Salvage Yard and three Department decks, reshuffle, and reestablish the Home Office
@@ -182,7 +236,11 @@ describe('Local Operations: drawing (§6.2)', () => {
     assert.ok(r.ok);
     assert.ok(r.events.some((e) => e.type === 'deckReshuffled'), 'no reshuffle was emitted');
 
-    assert.equal(s.decks.salvageYard.length, 0, 'the Salvage Yard must be swept');
+    // Swept EXCEPT the trains whose slots are already on the timetable — see the ruling test below.
+    assert.ok(
+      s.decks.salvageYard.every((id) => s.cards.get(id)?.kind.kind === 'timetabledTrain'),
+      'the Salvage Yard must be swept apart from spent timetabled trains',
+    );
     assert.ok(s.decks.homeOffice.length > 0, 'the deck must be re-established');
     assert.ok(
       s.decks.departments.every((p) => p.length === 1),

test/pacing.test.ts

@@ -14,7 +14,7 @@ import { readFileSync } from 'node:fs';
 import { dirname, join } from 'node:path';
 import { fileURLToPath } from 'node:url';
 
-import { DWELL, MAX_PACE, dwellFor, dwellForStep, kindOf, watchableCount } from '../src/sim/pacing.ts';
+import { DWELL, MAX_PACE, PACE_LEVELS, dwellFor, dwellForStep, kindOf, watchableCount } from '../src/sim/pacing.ts';
 import type { StepKind } from '../src/sim/pacing.ts';
 import type { Intent } from '../src/engine/intents.ts';
 
@@ -52,7 +52,7 @@ describe('pacing — dwell by kind', () => {
     assert.equal(kindOf('switch.end'), 'bookkeeping');
     /**
      * `localOps.choose` IS AN ANNOUNCEMENT, not bookkeeping — moved 2026-09-09 after the first real
-     * play on `phoenix.local`. It is the line reading "Player Bot 1 chose to SWITCH", the heading for
+     * play on the test server. It is the line reading "Player Bot 1 chose to SWITCH", the heading for
      * everything that follows, and at zero dwell a bot's turn began with no sign of what it was about
      * to do.
      */
@@ -120,6 +120,37 @@ describe('pacing — dwell by kind', () => {
     assert.equal(watchableCount(queue, 0), 0, 'with animation off, nothing is behind');
   });
 
+  it('offers speeds a player actually reached for, and none the code would clamp', () => {
+    /**
+     * Jesse played a whole game believing he was at 7× and was in fact at 1×: `?pace=` shipped as the
+     * only lever, and `index.html`'s doors are `play.html?lobby` / `play.html?solitaire`, so arriving
+     * from the splash REPLACES the query string. Hence a real control on the play screen, and hence
+     * this ladder — which must reach the speeds people ask for and must not offer one that
+     * `dwellFor` would silently clamp.
+     */
+    assert.equal(PACE_LEVELS[0], 0, 'off must be the first rung — #18 wants it turned off');
+    assert.ok(PACE_LEVELS.includes(1), 'the default must be on the ladder');
+    assert.ok(PACE_LEVELS.includes(7), '7x was asked for by name');
+    /**
+     * The ceiling is not theoretical. Jesse played at 10× — the top of the ladder as it then was —
+     * and called it "still a bit fast, but followable", so the ladder has to go past the speed
+     * somebody actually reached for and found insufficient.
+     */
+    assert.ok(PACE_LEVELS.some((p) => p > 10), 'the ladder must go beyond the speed that was too fast');
+    for (const p of PACE_LEVELS) {
+      assert.ok(p <= MAX_PACE, `${p}x is past MAX_PACE, so the control would lie about it`);
+      assert.equal(dwellFor('switch.move', p), Math.round(DWELL.switching * p));
+    }
+    // Strictly increasing, so stepping the control always changes the speed.
+    for (let i = 1; i < PACE_LEVELS.length; i++) {
+      assert.ok(PACE_LEVELS[i]! > PACE_LEVELS[i - 1]!, 'the ladder must be strictly increasing');
+    }
+    // The slowest rung has to be slow enough to be worth having: six switching moves at the top of
+    // the ladder is a full minute, which is the "watch them struggle" case.
+    const slowest = dwellFor('switch.move', PACE_LEVELS[PACE_LEVELS.length - 1]!) * 6;
+    assert.ok(slowest >= 60_000, `the slowest a switching turn can be watched is ${slowest}ms`);
+  });
+
   it('a silent step beats only when the clock turns over — TODO #18', () => {
     /**
      * Both obvious rules were wrong, so both are pinned. "No narration, no dwell" flashed past
@@ -127,18 +158,55 @@ describe('pacing — dwell by kind', () => {
      * that changed the board" beat on every turn hand-off — `submit()` steps `advance()` about 4.6
      * times per intent — which came to a quarter of an hour a game.
      */
-    const silent = { cause: 'phase' as const, lines: [] as string[] };
+    const silent = { cause: 'phase' as const, player: null, lines: [] as string[] };
     assert.equal(dwellForStep({ ...silent, frame: { table: { actor: 2 } } }), 0, 'a turn hand-off shows nothing');
     assert.equal(dwellForStep({ ...silent, frame: { table: {} } }), 0, 'a step that changed nothing shows nothing');
     assert.equal(dwellForStep({ ...silent, frame: { table: { phase: 'mainline' } } }), DWELL.phase);
     assert.equal(dwellForStep({ ...silent, frame: { table: { stage: 4 } } }), DWELL.phase);
     // Narration always earns the dwell of whatever caused it, clock or no clock.
     assert.equal(
-      dwellForStep({ cause: 'switch.move', lines: ['moved'], frame: { table: {} } }),
+      dwellForStep({ cause: 'switch.move', player: 1, lines: ['moved'], frame: { table: {} } }),
       DWELL.switching,
     );
   });
 
+  it('the speed control stretches the clock at a THIRD of the rate it stretches people', () => {
+    /**
+     * Two complaints, one from each direction, and the answer is between them.
+     *
+     * v0.8.0.3, from a 5× game: *"after my turn … I'm still subject to that same delay before it
+     * moves on. That makes no sense."* — phases were scaling with everything else and walling off a
+     * player's own turn. So they were pinned at their tabled beat.
+     *
+     * v0.8.0.7, from a 10× game: *"phases displayed on the upper line go by too quickly still.
+     * Should be 4 times as long — at a guess."* — pinned was too short to read the caption.
+     *
+     * Damped scaling satisfies both: 1× unchanged, 10× lands exactly on the four-times guess, and
+     * the cost stays bounded because phase beats cluster rather than accumulate.
+     */
+    const phase = { cause: 'phase' as const, player: null, lines: ['New Train'], frame: { table: { phase: 'newTrain' } } };
+    const theirs = { cause: 'switch.move' as const, player: 1, lines: ['moved'], frame: { table: {} } };
+
+    assert.equal(dwellForStep(phase, 1), DWELL.phase, '1x must be exactly the tabled beat');
+    assert.equal(dwellForStep(phase, 10), DWELL.phase * 4, '10x must be four times it, as asked for');
+
+    for (const pace of [2, 3, 5, 7, 10, 15, 20]) {
+      const p = dwellForStep(phase, pace);
+      const t = dwellForStep(theirs, pace);
+      assert.ok(p > DWELL.phase, `a phase must grow at ${pace}x`);
+      assert.ok(
+        p < DWELL.phase * pace,
+        `a phase must grow SLOWER than the multiplier at ${pace}x, or the clock walls off the turn`,
+      );
+      assert.ok(t > p, `somebody's move must still outlast a phase beat at ${pace}x`);
+    }
+    // Off still means off, for the clock as much as for anybody's move; and below 1x the clock
+    // follows the multiplier straight, because "faster" should mean everything.
+    assert.equal(dwellForStep(phase, 0), 0);
+    assert.equal(dwellForStep(theirs, 0), 0);
+    assert.equal(dwellForStep(phase, 0.5), DWELL.phase * 0.5);
+  });
+
   it('a real switching turn is watchable in a few seconds, not tens of them', () => {
     // Six moves is the engine's cap per crew ("N of 6 Moves left"), so this is the worst ordinary
     // case for one crew: the announcement, six moves, and an end that shows nothing.
@@ -155,7 +223,7 @@ describe('pacing — dwell by kind', () => {
 
   it("a bot's ordinary turn is followable, which is what the first real play was not", () => {
     /**
-     * MEASURED FROM A REAL GAME, then pinned. Jesse, after installing v0.8.0 on `phoenix.local`:
+     * MEASURED FROM A REAL GAME, then pinned. Jesse, after installing v0.8.0 on the test server:
      * *"bot play was way too fast. I briefly saw that it was the bot's office area then their turn
      * was done."* This is the shape that turn actually had — no switching in it at all, because
      * switching is not legal until there is track down — and under the original values it came to

test/public-delta.test.ts

@@ -17,7 +17,7 @@ import type { GameConfig, GameState, PlayerIndex } from '../src/engine/state.ts'
 import { applyIntent } from '../src/engine/apply.ts';
 import { currentActorOfState, publicSnapshot } from '../src/sim/view.ts';
 import type { PublicFrame } from '../src/sim/view.ts';
-import { applyPublicDelta, deltaPublicFrame } from '../src/sim/public-delta.ts';
+import { applyPublicDelta, changedPiles, deltaPublicFrame } from '../src/sim/public-delta.ts';
 
 const config: GameConfig = {
   mode: 'competitive',
@@ -184,3 +184,111 @@ describe('public frame delta', () => {
 });
 
 type PublicIndexed = { seat: number; before: PublicFrame; after: PublicFrame };
+
+describe('which piles a step moved', () => {
+  /**
+   * MEASURED FROM REAL PLAY, then pinned. The table in `changedPiles` claims what each action moves,
+   * and a claim in a comment is worth nothing unless something checks it — so this drives real games
+   * and asserts the mapping holds, action by action.
+   */
+  it('maps each action to the piles it actually touches', () => {
+    const seen = new Map<string, Set<string>>();
+    /**
+     * TWO PASSES, because a single driver cannot reach every case. Left to itself the bot almost
+     * never takes a Department card, and a driver that prefers one then never draws from the deck —
+     * so each preference is played out separately and the assertions below require BOTH to have
+     * been observed rather than passing on whichever happened to occur.
+     */
+    for (const prefer of ['draw.fromDepartment', 'draw.fromHomeOffice'] as const) {
+      for (const seed of [1917398, 191056, 4242]) {
+        const s = newState(seed);
+        for (let i = 0; i < 400; i++) {
+          const actor = currentActorOfState(s);
+          if (actor === null) break;
+          const options = legalActions(s, actor);
+          if (options.length === 0) break;
+          const chosen =
+            options.find((o) => o.type === prefer) ??
+            options.find((o) => o.type === 'card.discard') ??
+            options[i % options.length]!;
+          const before = publicSnapshot(s);
+          const r = applyIntent(s, actor, chosen);
+          if (!r.ok) break;
+          pump(s);
+          const piles = changedPiles(before, publicSnapshot(s)).map((p) => p.replace(/dept\d/, 'dept'));
+          if (!seen.has(chosen.type)) seen.set(chosen.type, new Set());
+          for (const p of piles) seen.get(chosen.type)!.add(p);
+          if (piles.length === 0) seen.get(chosen.type)!.add('(none)');
+        }
+      }
+    }
+
+    const of = (t: string): Set<string> => seen.get(t) ?? new Set();
+    // NOT VACUOUS: the four cases the mapping is actually about must all have happened.
+    for (const needed of ['draw.fromHomeOffice', 'draw.fromDepartment', 'card.discard', 'card.play']) {
+      assert.ok(of(needed).size > 0, `${needed} never occurred, so its rule proved nothing`);
+    }
+
+    // A HOME OFFICE DRAW MOVES THE COUNT AND NOTHING ELSE ON A PILE. The card is private; the deck
+    // getting shorter is not, and it is the only thing a watcher can be shown.
+    assert.deepEqual([...of('draw.fromHomeOffice')].sort(), ['home']);
+    // A DEPARTMENT DRAW touches that Department, and sometimes the deck too — the pile refills from
+    // it. Both are public, so both may light.
+    for (const p of of('draw.fromDepartment')) {
+      assert.ok(p === 'dept' || p === 'home', `a Department draw moved "${p}"`);
+    }
+    assert.ok(of('draw.fromDepartment').has('dept'), 'a Department draw must light its Department');
+    // A DISCARD lands face up on a Department, and which one is public.
+    assert.deepEqual([...of('card.discard')].sort(), ['dept']);
+    // A PLAYED CARD that does not stay on the board lands face up in the Salvage Yard.
+    assert.ok(of('card.play').has('salvage'), 'a played card must be able to light the Salvage Yard');
+    // ENDING A PHASE moves no card anywhere, so nothing should light for it.
+    for (const quiet of ['draw.end', 'loadUnload.end', 'switch.end', 'localOps.choose']) {
+      if (of(quiet).size > 0) assert.deepEqual([...of(quiet)], ['(none)'], `${quiet} lit a pile`);
+    }
+  });
+
+  it('lights nothing without a previous frame to compare against', () => {
+    // A reset has nothing to have watched arriving, so nothing on it is lit.
+    const s = newState(4242);
+    assert.deepEqual(changedPiles(null, publicSnapshot(s)), []);
+  });
+});
+
+describe('a Mainline card that changed under the players (Gitea#28)', () => {
+  it('names the node a Realignment converted, and nothing else', async () => {
+    const { changedDivisionCards } = await import('../src/sim/public-delta.ts');
+    const { REALIGNMENTS } = await import('../src/engine/content.ts');
+
+    const s = newState(4242);
+    const before = publicSnapshot(s);
+
+    // Realignment converts a card to another kind (`content.ts`'s table). Applied to the state directly:
+    // what is being tested is the DETECTOR, not the play that reaches it — which needs the card in hand,
+    // the draw option taken and no train on the card.
+    const at = s.division.nodes.findIndex((n) => n.kind === 'mainline' && REALIGNMENTS.some((r) => r.from === n.card));
+    assert.ok(at >= 0, 'no Mainline card in this Division can be realigned at all');
+    const node = s.division.nodes[at];
+    assert.equal(node?.kind, 'mainline');
+    if (node?.kind === 'mainline') {
+      node.card = REALIGNMENTS.find((r) => r.from === node.card)!.to;
+    }
+    const after = publicSnapshot(s);
+
+    assert.deepEqual(changedDivisionCards(before, after), [at], 'the realigned card was not the one reported');
+    assert.deepEqual(changedDivisionCards(after, after), [], 'an unchanged Division reported a change');
+    assert.deepEqual(changedDivisionCards(null, after), [], 'a first board has nothing to compare against');
+  });
+
+  it('says nothing when only the trains on a card moved', async () => {
+    const { changedDivisionCards } = await import('../src/sim/public-delta.ts');
+    const s = newState(1917398);
+    const before = publicSnapshot(s);
+    const at = s.division.nodes.findIndex((n) => n.kind === 'mainline');
+    const node = s.division.nodes[at];
+    if (node?.kind === 'mainline') {
+      node.transits.push({ tray: 'tray1', stagesRemaining: 1, stagesTotal: 1, direction: 'east' });
+    }
+    assert.deepEqual(changedDivisionCards(before, publicSnapshot(s)), [], 'a train arriving flashed the card');
+  });
+});

test/redaction.test.ts

@@ -524,6 +524,9 @@ describe('#91 — nothing private survives serialisation, in any state', () => {
       // The rules the game was dealt under, and the score.
       'houseRules', 'mode', 'optionalRules', 'days', 'minCombinedRevenue',
       'maxCollisionsPerDay', 'maxCollisionsTotal', 'collisionsToday', 'collisionsTotal',
+      // What the Day that just ended finished on. Public for the same reason the running counts are:
+      // a collision happens on the Mainline in front of everybody.
+      'collisionsPrevDay',
       'status', 'outcome', 'extraDays', 'extensionVotes', 'official', 'tally',
       // Names, seats, revenue and HAND SIZE — never hand contents.
       'players',

test/route-cache.test.ts

@@ -0,0 +1,88 @@
+/**
+ * The engine's speed-ups must not change a single game (2026-09-15).
+ *
+ * `applyIntent` became `prepareIntent` (check and execute, sharing one walk of the position's routes)
+ * followed by `commitEvents` (reduce and tally), so the switching planner can decide every candidate
+ * against one position and apply each to a copy. Two properties hold that together:
+ *
+ * 1. `prepareIntent` never writes the state it reads — including through the route cache it opens.
+ * 2. Preparing on one state and committing to an EQUAL copy lands on exactly what `applyIntent` does.
+ *
+ * Checked at every decision of seeded bot games rather than on hand-built positions, so the intents
+ * exercised are the ones real play submits.
+ */
+
+import { describe, it } from 'node:test';
+import assert from 'node:assert/strict';
+
+import { pump } from '../src/engine/advance.ts';
+import { applyIntent, commitEvents, prepareIntent } from '../src/engine/apply.ts';
+import {
+  DEFAULT_MAX_COLLISIONS_PER_DAY,
+  DEFAULT_MAX_COLLISIONS_TOTAL,
+  collectiveRevenueFloor,
+  lengthProfile,
+} from '../src/engine/content.ts';
+import { legalActions } from '../src/engine/legal.ts';
+import { createGame } from '../src/engine/setup.ts';
+import type { GameConfig, GameState } from '../src/engine/state.ts';
+import { developerBot, playGame } from '../src/sim/bot.ts';
+
+const config = (): GameConfig => {
+  const days = lengthProfile('short').days;
+  return {
+    mode: 'solitaire',
+    days,
+    minCombinedRevenue: collectiveRevenueFloor(1, days),
+    maxCollisionsPerDay: DEFAULT_MAX_COLLISIONS_PER_DAY,
+    maxCollisionsTotal: DEFAULT_MAX_COLLISIONS_TOTAL,
+    pvpCardsAllowed: false,
+    optionalRules: { reducedVisibility: false, employeeRotation: false, emergencyToolbox: false },
+  };
+};
+
+const serialise = (s: GameState): string =>
+  JSON.stringify(s, (_k, v) => (v instanceof Map ? [...v] : v instanceof Set ? [...v] : v));
+
+describe('applyIntent split into prepareIntent and commitEvents', () => {
+  it('prepares without writing, and committing to a copy matches applying in place', () => {
+    let decisions = 0;
+    let rejectedSeen = 0;
+    const s = createGame({ id: 'split-8919', seed: 8919, config: config(), playerNames: ['bot'] });
+    const policy = {
+      name: 'split-probe',
+      choose(st: GameState, player: number, options: ReturnType<typeof legalActions>) {
+        const chosen = developerBot.choose(st, player, options);
+        if (decisions < 400) {
+          decisions++;
+          const before = serialise(st);
+          const prepared = prepareIntent(st, player, chosen);
+          assert.equal(serialise(st), before, `decision ${decisions}: prepareIntent wrote into the state it read`);
+          assert.ok(prepared.ok, `decision ${decisions}: a legal choice was refused by prepareIntent`);
+
+          const viaCommit = structuredClone(st);
+          const viaApply = structuredClone(st);
+          commitEvents(viaCommit, prepared.events);
+          const applied = applyIntent(viaApply, player, chosen);
+          assert.ok(applied.ok);
+          assert.deepEqual(applied.events, prepared.events, `decision ${decisions}: the two paths produced different events`);
+          assert.equal(serialise(viaCommit), serialise(viaApply), `decision ${decisions}: committing to a copy diverged from applying`);
+
+          // A refused intent must come back refused from both paths, with nothing written.
+          const refused = { type: 'switch.end' } as const;
+          const r = prepareIntent(st, player, refused);
+          if (!r.ok) {
+            rejectedSeen++;
+            assert.equal(serialise(st), before);
+            assert.equal(applyIntent(structuredClone(st), player, refused).ok, false);
+          }
+        }
+        return chosen;
+      },
+    };
+    const r = playGame(s, policy, pump);
+    assert.ok(r.finished, 'the probed game did not finish');
+    assert.ok(decisions > 0, 'no decision was probed');
+    assert.ok(rejectedSeen > 0, 'no refused intent was exercised');
+  });
+});

test/step-queue.test.ts

@@ -15,7 +15,7 @@ import { currentActor, newMultiplayerGame, submit } from '../src/web/game.ts';
 import { publicSnapshot } from '../src/sim/view.ts';
 import { takeSteps } from '../src/sim/display-step.ts';
 import type { DisplayStep } from '../src/sim/display-step.ts';
-import { createStepQueue } from '../src/web/step-queue.ts';
+import { actorOnScreen, createStepQueue } from '../src/web/step-queue.ts';
 import { DWELL } from '../src/sim/pacing.ts';
 
 const config: GameConfig = {
@@ -179,7 +179,7 @@ describe('the step queue', () => {
      * REGRESSION. `busy()` was `pending.length > 0`, so the instant the final step of a burst was
      * shown the queue reported idle: the animation loop stopped and the district panel snapped back
      * to the viewer's own board without that step ever being looked at. Jesse, from the first real
-     * play on `phoenix.local`: *"I briefly saw that it was the bot's office area then their turn was
+     * play on the test server: *"I briefly saw that it was the bot's office area then their turn was
      * done and it pointed back to my office area"*, and the countdown row appeared "very briefly".
      *
      * The panel follows `busy()`, so this is the property that keeps somebody else's board on screen
@@ -251,6 +251,25 @@ describe('the step queue', () => {
     assert.ok(q.showing() !== null, 'the caption should survive a reset');
   });
 
+  it('can always be emptied, so a player is never stranded behind it', () => {
+    /**
+     * "Your Move" is put away while the board is catching up (v0.8.0.6), which makes `busy()` the
+     * thing standing between a player and their own turn. So the ways it can be cleared matter more
+     * than they did: `skip()` must always work, from any state, including one where the clock has
+     * never advanced — which is exactly the situation a page with no `requestAnimationFrame` is in,
+     * and how this was found.
+     */
+    const { steps, final } = realSteps(1917398, 400);
+    const q = createStepQueue();
+    q.reset(baseline(1917398));
+    q.push(steps);
+    // Never advanced at all: no frame has been shown, and the queue is full.
+    assert.equal(q.busy(), true);
+    assert.equal(q.skip(), true, 'a never-advanced queue must still be skippable');
+    assert.equal(q.busy(), false, 'and must be idle afterwards, or the player stays locked out');
+    assert.deepEqual(q.current(), final);
+  });
+
   it('draws nothing before a reset has arrived', () => {
     const q = createStepQueue();
     assert.equal(q.current(), null);
@@ -259,3 +278,77 @@ describe('the step queue', () => {
     assert.equal(q.showing(), null);
   });
 });
+
+describe('whose move the screen is showing (Gitea#25)', () => {
+  const step = (player: number | null) => ({ player }) as DisplayStep;
+  const queue = (behind: number, busy: boolean, showing: DisplayStep | null) => ({
+    behind: () => behind,
+    busy: () => busy,
+    showing: () => showing,
+  });
+
+  it('names the live actor once the board has caught up', () => {
+    assert.deepEqual(actorOnScreen(queue(0, false, step(2)), 0), { actor: 0, replaying: false });
+  });
+
+  it('names the player of the step on screen while the board is behind — not the live actor', () => {
+    // One human (seat 0) against bots: the live game already waits on seat 0 while bot 2's moves replay.
+    assert.deepEqual(actorOnScreen(queue(3, true, step(2)), 0), { actor: 2, replaying: true });
+  });
+
+  it('keeps naming the last step while it is still on screen, after the counter reaches zero', () => {
+    assert.deepEqual(actorOnScreen(queue(0, true, step(1)), 0), { actor: 1, replaying: true });
+  });
+
+  it('names nobody for an automatic phase being shown', () => {
+    assert.deepEqual(actorOnScreen(queue(2, true, step(null)), 0), { actor: null, replaying: true });
+  });
+
+  it('falls back to the live actor before any step has been shown', () => {
+    assert.deepEqual(actorOnScreen(queue(1, true, null), 3), { actor: 3, replaying: false });
+  });
+});
+
+describe('the log is held back with the board, and a changed card flashes (playtest, 2026-09-15)', () => {
+  it('owes exactly the lines of the steps not yet shown', () => {
+    const { steps } = realSteps(1917398, 400);
+    const q = createStepQueue();
+    q.reset(baseline(1917398));
+    assert.equal(q.pendingLines(), 0, 'an empty queue holds nothing back');
+
+    q.push(steps);
+    const owed = steps.reduce((n, s) => n + s.lines.length, 0);
+    assert.equal(q.pendingLines(), owed, 'every queued step still owes its lines');
+
+    // Drive the clock as a render loop would; the debt falls monotonically and ends at nothing.
+    let now = 0;
+    let last = owed;
+    for (let i = 0; i < 20_000 && q.busy(); i++) {
+      q.advance(now);
+      const left = q.pendingLines();
+      assert.ok(left <= last, 'the held-back count grew while the board caught up');
+      last = left;
+      now += 50;
+    }
+    assert.equal(q.pendingLines(), 0, 'the board caught up but lines were still withheld');
+  });
+
+  it('skipping reveals the whole log at once', () => {
+    const { steps } = realSteps(1917398, 400);
+    const q = createStepQueue();
+    q.reset(baseline(1917398));
+    q.push(steps);
+    q.skip();
+    assert.equal(q.pendingLines(), 0, 'Skip left lines withheld — the history would stay short');
+  });
+
+  it('flashes nothing on an ordinary step', () => {
+    // Realignment is rare in bot play, so this pins the quiet case: the map must not pulse at random.
+    const { steps } = realSteps(1917398, 400);
+    const q = createStepQueue();
+    q.reset(baseline(1917398));
+    q.push(steps.slice(0, 5));
+    q.advance(0);
+    assert.deepEqual(q.flashing(), [], 'a step that changed no Mainline card flashed one');
+  });
+});

test/switch-planner.test.ts

@@ -0,0 +1,100 @@
+/**
+ * The switching planner (`sim/switch-planner.ts`) — the two properties it cannot be allowed to lose.
+ *
+ * 1. PLANNING TOUCHES NOTHING. The planner applies intents to a partial copy of the game
+ *    (`forkForSwitching`) that shares everything a switching intent is not supposed to write. If a
+ *    reducer ever starts writing somewhere new, the copy leaks into the real game, and this is where
+ *    that shows: the game is serialised before and after planning and must not have changed.
+ * 2. A PLAN IS WHAT THE ENGINE WILL DO. Every step replays through `applyIntent` on a FULL copy, and
+ *    lands on the fingerprint the planner promised for it. That is what makes the partial copy
+ *    trustworthy, and it is what the bot relies on to know it is still on plan.
+ *
+ * Taken from real seeded bot games rather than hand-built positions, because a district that
+ * satisfies the track geometry by hand tests the builder as much as the planner.
+ */
+
+import { describe, it } from 'node:test';
+import assert from 'node:assert/strict';
+
+import { pump } from '../src/engine/advance.ts';
+import { applyIntent } from '../src/engine/apply.ts';
+import { legalActions, legalSwitchingActions } from '../src/engine/legal.ts';
+import {
+  DEFAULT_MAX_COLLISIONS_PER_DAY,
+  DEFAULT_MAX_COLLISIONS_TOTAL,
+  MOVES_PER_LOCAL_OPS,
+  collectiveRevenueFloor,
+  lengthProfile,
+} from '../src/engine/content.ts';
+import { createGame } from '../src/engine/setup.ts';
+import type { GameConfig, GameState } from '../src/engine/state.ts';
+import { actingPlayer, turnOf } from '../src/engine/state.ts';
+import { developerBot, playGame } from '../src/sim/bot.ts';
+import { planSwitchingTurn, switchFingerprint } from '../src/sim/switch-planner.ts';
+
+const config = (): GameConfig => {
+  const days = lengthProfile('short').days;
+  return {
+    mode: 'solitaire',
+    days,
+    minCombinedRevenue: collectiveRevenueFloor(1, days),
+    maxCollisionsPerDay: DEFAULT_MAX_COLLISIONS_PER_DAY,
+    maxCollisionsTotal: DEFAULT_MAX_COLLISIONS_TOTAL,
+    pvpCardsAllowed: false,
+    optionalRules: { reducedVisibility: false, employeeRotation: false, emergencyToolbox: false },
+  };
+};
+
+const serialise = (s: GameState): string =>
+  JSON.stringify(s, (_k, v) => (v instanceof Map ? [...v] : v instanceof Set ? [...v] : v));
+
+describe('switching planner', () => {
+  it('asks for switching intents that are exactly the switching subset of legalActions, in order', () => {
+    const SWITCHING = new Set(['switch.move', 'switch.dropCars', 'switch.sortConsist', 'maneuver.flyingSwitch', 'switch.end']);
+    let compared = 0;
+    for (const seed of [1000, 8919]) {
+      const s = createGame({ id: `legal-${seed}`, seed, config: config(), playerNames: ['bot'] });
+      playGame(s, developerBot, pump, 50_000, undefined, (st) => {
+        const p = actingPlayer(st);
+        if (p === null || st.clock.phase !== 'localOps') return;
+        const all = legalActions(st, p).filter((i) => SWITCHING.has(i.type));
+        assert.deepEqual(legalSwitchingActions(st, p), all);
+        compared++;
+      });
+    }
+    assert.ok(compared > 0, 'no Local Operations decision was reached');
+  });
+
+  it('never changes the game it plans for, and every plan replays to the position it promised', () => {
+    let checked = 0;
+    let withSteps = 0;
+    for (const seed of [1000, 8919, 16838]) {
+      const s = createGame({ id: `plan-${seed}`, seed, config: config(), playerNames: ['bot'] });
+      const r = playGame(s, developerBot, pump, 50_000, undefined, (st) => {
+        const p = actingPlayer(st);
+        if (p === null || st.clock.phase !== 'localOps') return;
+        const turn = turnOf(st, p);
+        if (turn.option !== 'switch' || turn.movesRemaining !== MOVES_PER_LOCAL_OPS) return;
+
+        const before = serialise(st);
+        const plan = planSwitchingTurn(st, p, { budget: 400, beam: 16 });
+        assert.equal(serialise(st), before, `seed ${seed}: planning wrote into the real game`);
+        assert.ok(plan.score >= plan.rootScore, 'a plan is never worse than stopping where the crew stands');
+
+        const copy = structuredClone(st);
+        plan.steps.forEach((step, n) => {
+          assert.equal(switchFingerprint(copy, p), plan.keys[n], `seed ${seed}: step ${n} started off plan`);
+          const applied = applyIntent(copy, p, step);
+          assert.ok(applied.ok, `seed ${seed}: step ${n} (${step.type}) was refused by the engine`);
+        });
+        assert.equal(switchFingerprint(copy, p), plan.keys.at(-1), `seed ${seed}: the plan did not end where it said`);
+
+        checked++;
+        if (plan.steps.length > 0) withSteps++;
+      });
+      assert.ok(r.finished, `seed ${seed}: a game with the planner switched on did not finish`);
+    }
+    assert.ok(checked > 0, 'no switching turn was reached, so nothing was tested');
+    assert.ok(withSteps > 0, 'every plan was empty, so replay was never exercised');
+  });
+});

test/tally.test.ts

@@ -151,10 +151,14 @@ describe('the tally counts every event exactly once (Gitea#16)', () => {
 
   it('splits Revenue into what was earned and what was given back', () => {
     // Reconciliation is the real assertion and it holds for any game, earned or not: gained minus
-    // lost IS the score the engine kept. Seed 42 is named because it is one where Revenue actually
+    // lost IS the score the engine kept. Seed 44 is named because it is one where Revenue actually
     // moves in both directions — it earns 1 and gives back 5 to a collision — so the two halves are
     // being told apart rather than both sitting at zero.
-    for (const seed of [1, 7, 42]) {
+    //
+    // It was seed 42 until v0.8.0.10. That game's collision was the Superintendent holding a train over
+    // one BEHIND it (Gitea#26); with the ruling gone the collision is too, and seed 42 now earns 5 and
+    // loses nothing — a better game and a vacuous test. The seed moved, not the assertion.
+    for (const seed of [1, 7, 44]) {
       const { state } = playKeepingEvents(seed);
       const me = state.tally.byPlayer[0]!;
       assert.equal(
@@ -163,10 +167,10 @@ describe('the tally counts every event exactly once (Gitea#16)', () => {
         `seed ${seed}: gained minus lost does not reconcile with the score the engine kept`,
       );
     }
-    const { state } = playKeepingEvents(42);
+    const { state } = playKeepingEvents(44);
     const me = state.tally.byPlayer[0]!;
-    assert.ok(me.revenueGained > 0, 'seed 42 earned nothing — the gained half is not being counted');
+    assert.ok(me.revenueGained > 0, 'seed 44 earned nothing — the gained half is not being counted');
-    assert.ok(me.revenueLost > 0, 'seed 42 lost nothing — the lost half is not being counted');
+    assert.ok(me.revenueLost > 0, 'seed 44 lost nothing — the lost half is not being counted');
   });
 
   it('records a Circus set-up as the one-off it is, not as a streak', () => {

test/watchable.test.ts

@@ -309,3 +309,71 @@ describe('steps reach a seated player — TODO #13', () => {
     assert.ok(seen > 0, 'no steps reached a push, so this proved nothing');
   });
 });
+
+describe('the log says who acted, once, and in what capacity (Gitea#30, #31)', () => {
+  it('never names a player twice — no "Player Jesse player 0 finished …"', async () => {
+    const { newMultiplayerGame, currentActor, submit } = await import('../src/web/game.ts');
+    const { legalActions } = await import('../src/engine/legal.ts');
+
+    const game = newMultiplayerGame(1917398, config, ['Alice', 'Bob', 'Carol']);
+    for (let i = 0; i < 400; i++) {
+      const actor = currentActor(game);
+      if (actor === null) break;
+      const options = legalActions(game.state, actor);
+      if (options.length === 0) break;
+      if (!submit(game, options.find((o) => o.type === 'localOps.choose') ?? options[0]!)) break;
+    }
+
+    assert.ok(game.log.length > 50, 'the game barely ran, so this proved little');
+    for (const line of game.log) {
+      // `record()` prefixes the acting player's NAME; a narration that also named them read
+      // "Player Alice player 0 finished Local Operations" (playtest, 2026-09-15).
+      assert.doesNotMatch(
+        line.text,
+        /\bplayer \d+\b/i,
+        `a line still carries a bare player index: ${line.text}`,
+      );
+    }
+  });
+
+  it('attributes a clearance ruling to the office, not to the seat\'s own turn', async () => {
+    const { newMultiplayerGame, drain, submit } = await import('../src/web/game.ts');
+    const { areaOf } = await import('../src/engine/apply.ts');
+
+    const game = newMultiplayerGame(7, config, ['Alice', 'Bob', 'Carol']);
+    const s = game.state;
+    const area = areaOf(s, 0);
+
+    // A westbound train at seat 0's Office, and another westbound AHEAD of it — west of the Office —
+    // which is §8.1's fourth condition and the Superintendent's to rule on (see Gitea#26).
+    s.trays.set('departing', {
+      id: 'departing', trainNumber: 15, trainIsExtra: true, engineAt: 0, consist: [],
+      direction: 'west', facing: 'w',
+      position: { at: 'grid', seat: 0, coord: area.officeCoord }, movesUsed: 0,
+    } as never);
+    area.adOccupancy.push('departing');
+    const office = s.division.nodes.findIndex((n) => n.kind === 'office' && n.seat === 0);
+    const card = s.division.nodes.findIndex((n, i) => i < office && n.kind === 'mainline');
+    const node = s.division.nodes[card];
+    assert.equal(node?.kind, 'mainline');
+    s.trays.set('ahead', {
+      id: 'ahead', trainNumber: 9, trainIsExtra: false, engineAt: 0, consist: [],
+      direction: 'west', facing: 'w', position: { at: 'mainline', index: card }, movesUsed: 0,
+    } as never);
+    if (node?.kind === 'mainline') {
+      node.transits.push({ tray: 'ahead', stagesRemaining: 2, stagesTotal: 2, direction: 'west' });
+    }
+
+    s.clock.phase = 'mainline';
+    drain(game);
+    assert.equal(s.clock.pendingDecision?.kind, 'clearance', 'no ruling was called for, so nothing was tested');
+
+    const before = game.log.length;
+    assert.ok(submit(game, { type: 'mainline.clearance', allow: false }, s.clock.superintendent));
+    const said = game.log.slice(before).map((l) => l.text);
+    assert.ok(
+      said.some((text) => text.startsWith('Superintendent Player ')),
+      `a ruling did not read as the office's: ${said.join(' | ')}`,
+    );
+  });
+});

test/web.test.ts

@@ -23,7 +23,7 @@ import { variantsFor } from '../src/engine/track.ts';
 import { divisionSvg, officeSvg } from '../src/sim/board-svg.ts';
 import type { DivisionView } from '../src/sim/view.ts';
 import { ENHANCEMENT_RULES, STAGES_PER_DAY } from '../src/engine/content.ts';
-import { dayEndHtml, facilitiesHtml, resultsHtml, timetableHtml } from '../src/web/panels.ts';
+import { dayEndHtml, facilitiesHtml, pilesHtml, resultsHtml, timetableHtml } from '../src/web/panels.ts';
 import { turnChartHtml } from '../src/sim/turnchart.ts';
 import { fieldSelectors } from '../src/web/settings-form.ts';
 import { record, renderHtml } from '../src/sim/replay.ts';
@@ -3614,6 +3614,108 @@ describe('the Day rolling over says so (Gitea#10)', () => {
     assert.ok(html.includes('3 Days left'), `the Days remaining are wrong:\n${html}`);
   });
 
+  it('draws the Home Office deck, face down, with its count', () => {
+    /**
+     * `f.deck` has carried the face-down count since the Frame existed and NOTHING drew it — the
+     * exact display gap `test/display-gaps.test.ts` sweeps for, surviving in the panel that draws
+     * every other pile. Asked for by Jesse 2026-09-10, who also wanted somewhere for a draw to
+     * flash: taking a card off this deck is the commonest move nobody can see.
+     */
+    const s = createEngineGame({
+      id: 'piles',
+      seed: 5,
+      config: {
+        mode: 'competitive', days: 5, minCombinedRevenue: 60,
+        maxCollisionsPerDay: 0, maxCollisionsTotal: 0, pvpCardsAllowed: false,
+        optionalRules: { reducedVisibility: false, employeeRotation: false, emergencyToolbox: false },
+      },
+      playerNames: ['Joe', 'Bot 1'],
+    });
+    const f = snapshot(s, [], null);
+    assert.ok(f.deck > 0, 'the deal should leave cards in the Home Office deck');
+
+    const html = pilesHtml(f);
+    assert.ok(html.includes('Home Office'), `no Home Office pile:\n${html}`);
+    assert.ok(html.includes(`>${f.deck}<`), 'the face-down count is not shown');
+    // Face down means the card slot must NOT name a card — that is the whole point of the pile.
+    assert.ok(html.includes('facedown'), 'the Home Office pile is not marked face down');
+    assert.ok(html.includes('face down'), 'the card slot should say so rather than naming a card');
+    // It comes first: a card travels out of here, then onto a Department or the Salvage Yard.
+    assert.ok(
+      html.indexOf('Home Office') < html.indexOf('Dept 1'),
+      'the draw deck should be read before the piles cards land on',
+    );
+  });
+
+  it('lights only the pile a watched move touched', () => {
+    const s = createEngineGame({
+      id: 'piles2',
+      seed: 5,
+      config: {
+        mode: 'competitive', days: 5, minCombinedRevenue: 60,
+        maxCollisionsPerDay: 0, maxCollisionsTotal: 0, pvpCardsAllowed: false,
+        optionalRules: { reducedVisibility: false, employeeRotation: false, emergencyToolbox: false },
+      },
+      playerNames: ['Joe', 'Bot 1'],
+    });
+    const f = snapshot(s, [], null);
+
+    assert.equal(pilesHtml(f).includes('pilelit'), false, 'nothing is lit when nothing was watched');
+
+    const home = pilesHtml(f, ['home']);
+    assert.equal((home.match(/pilelit/g) ?? []).length, 1, 'exactly one pile should light');
+    assert.ok(
+      home.indexOf('pilelit') < home.indexOf('Dept 1'),
+      'a Home Office draw must light the Home Office pile, not a Department',
+    );
+
+    const dept2 = pilesHtml(f, ['dept1']);
+    assert.equal((dept2.match(/pilelit/g) ?? []).length, 1);
+    assert.ok(dept2.indexOf('Dept 2') > dept2.indexOf('Dept 1'), 'order sanity');
+    // Two piles can move at once — a Department draw that refills from the deck.
+    assert.equal((pilesHtml(f, ['home', 'dept0']).match(/pilelit/g) ?? []).length, 2);
+  });
+
+  it('reports the ENDED Day\'s collisions, not the fresh Day\'s zero', () => {
+    /**
+     * Jesse, 2026-09-09, at the end of a Day 1 with two collisions in it: *"It shows a total of two
+     * collisions, but zero today. Since we just finished day one, that does seem to be a
+     * contradiction."*
+     *
+     * The cause is a one-line ordering fact: `advance.ts` increments the Day and then zeroes
+     * `collisionsToday`, and this dialog is drawn from the frame whose Day went UP — so it read the
+     * fresh Day's zero and printed it beside a running total that could not agree with it. The count
+     * is captured at the rollover now, and the dialog names the Day rather than saying "today".
+     */
+    const s = createEngineGame({
+      id: 'collide',
+      seed: 5,
+      config: {
+        mode: 'competitive',
+        days: 5,
+        minCombinedRevenue: 60,
+        maxCollisionsPerDay: 3,
+        maxCollisionsTotal: 10,
+        pvpCardsAllowed: false,
+        optionalRules: { reducedVisibility: false, employeeRotation: false, emergencyToolbox: false },
+      },
+      playerNames: ['Joe', 'Bot 1'],
+    });
+    // The state as the rollover out of Day 1 leaves it: two collisions happened, `today` is reset.
+    s.clock.day = 2;
+    s.collisionsPrevDay = 2;
+    s.collisionsToday = 0;
+    s.collisionsTotal = 2;
+
+    const html = dayEndHtml(snapshot(s, [], null));
+    assert.ok(html.includes('Day 1 has ended'), `wrong Day named:\n${html}`);
+    assert.ok(html.includes('<b>2</b> on Day 1'), `the ended Day's collisions are wrong:\n${html}`);
+    assert.ok(html.includes('<b>2</b> in all'), `the running total is wrong:\n${html}`);
+    assert.doesNotMatch(html, /<b>0<\/b> today/, `still reporting the fresh Day's zero:\n${html}`);
+    // The contradiction itself: a Day-end dialog must never claim fewer in all than on that Day.
+    assert.doesNotMatch(html, /<b>0<\/b> on Day 1/, 'reported no collisions on a Day that had two');
+  });
+
   it('counts the last Day as the last Day rather than promising more', () => {
     const html = dayEndHtml(frameAt(6));
     assert.ok(html.includes('Day 5 has ended'), 'the final Day is misnamed');