Three rulings from the night games (rules rev 2)

Teleport wraps the maze's rim: its four counted squares now step through warp mouths like any doorway, so a wizard can blink off one side of the board and onto the other. A wizard at a door's threshold may pull it open and peek — lock removed, door unlocked this turn, or PICK LOCK / MASTER KEY in hand — without stepping through. The door still hangs shut to everyone down the hallway; only a HELD door is propped open for every eye. Gated behind rules rev 2 (now sourced from the engine's CURRENT_RULES_REV) so stored games replay with their doors dark; the client's sight mirror learns the same peek. Fear no longer nails a cornered wizard to the floor: a step closer to the dread is allowed when it walks the shortest way out of it, so escape can round a corner. Standing outside and stepping in is still refused. All 15 production ledgers verified before deploy; 269 engine tests. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015RCWSTnb1KYTPyL4GmhGnF
2026-08-25 14:28:12 -04:00
parent 2932d1e500
commit 154e00141c
6 changed files with 241 additions and 45 deletions
@@ -225,6 +225,9 @@ export interface CastParams {
  hold?: boolean;
 }

+/** The revision new games are dealt under; GameConfig.deckRev pins it per game. */
+export const CURRENT_RULES_REV = 2;
+
 export interface GameConfig {
  playerIds: PlayerId[];
  seed: number;
@@ -235,17 +238,10 @@ export interface GameConfig {
  colors?: number[];
  /**
   * Rules revision, frozen per game so stored games replay unchanged.
-   * Absent = original. Rev 2: LIFESAVER leaves two-player decks ("Not
-   * applicable in a 2-player game."). Rev 3: WARD springs only when armed,
-   * and CHAOS honors FULL SHIELD sit-outs and refuses REFLECTIONS. Rev 4:
-   * creature blows open a counteraction window like any attack. Rev 5:
-   * BIG MAN pushes occupants ahead, steps over floor hazards for 2 points,
-   * and bars monsters from his square. Rev 6: ANTI-ANTI cannot pin a
-   * teleport escape ("does not work against escape" — the card face).
-   * Rev 7: no behavioral change — every board opening carries warp sight
-   * in every revision. DIMENSIONAL WARP's tokens never do ("There is no L.O.S. through the
-   * warp." — the card face). Rev 8: nothing can be created on a warp token,
-   * and a SPEED bonus turn burns a turn of durations on the hastened wizard.
+   * Absent = rev 1, the baseline all earlier revisions collapsed into.
+   * Rev 2: a wizard beside a door they can open (lock removed, door
+   * unlocked this turn, or PICK LOCK / MASTER KEY in hand) sees through
+   * the doorway; the hallway behind them still cannot.
   */
  deckRev?: number;
 }
@@ -348,19 +344,42 @@ export function losBlockers(state: GameState): Record<string, true> {
  return blockers;
 }

-/** A held-open door is an open doorway to the eye: REMOVE LOCK's "still
- * considered to block L.O.S." speaks of a CLOSED door, and
- * the table holds doors open precisely to cast back through them. */
-function openHeldDoors(state: GameState, board: AssembledBoard): AssembledBoard {
+/** A door HELD open is propped ajar for every eye in the hallway. Any
+ * other door hangs shut, and a shut door blocks L.O.S. — see doorsAjar
+ * for the one wizard who may pull it open and peek. */
+function openedDoors(state: GameState, board: AssembledBoard): AssembledBoard {
  if (state.heldDoors.length === 0) return board;
  const edges = { ...board.edges };
  for (const h of state.heldDoors) delete edges[h.key];
  return { ...board, edges };
 }

+/** A wizard at a door's threshold may pull it open and look through
+ * without stepping through: any wizard beside a door whose lock is
+ * REMOVED or that stands unlocked this turn, and a holder of PICK LOCK
+ * or MASTER KEY beside any workable lock. The door still hangs shut to
+ * everyone down the hallway. (Rules rev 2; earlier games replay with
+ * doors dark.) */
+function doorsAjar(state: GameState, viewerId: PlayerId | undefined, board: AssembledBoard): AssembledBoard {
+  if ((state.config.deckRev ?? 1) < 2 || !viewerId) return board;
+  const viewer = state.players.find((p) => p.id === viewerId);
+  if (!viewer || !viewer.alive) return board;
+  const carriesKey = viewer.hand.some((c) => c.cardId === "pick-lock" || c.cardId === "master-key");
+  let edges: Record<string, EdgeState> | null = null;
+  for (const side of SIDES) {
+    const key = edgeKey(viewer.position, side);
+    if (board.edges[key] !== "door") continue;
+    const workable = carriesKey && state.doorStates[key] !== "jammed";
+    if (!workable && state.doorStates[key] !== "removed" && !state.openDoorEdges.includes(key)) continue;
+    if (!edges) edges = { ...board.edges };
+    delete edges[key];
+  }
+  return edges ? { ...board, edges } : board;
+}
+
 /** LOS including square-filling blockers. */
-export function gameLos(state: GameState, from: Cell, to: Cell): boolean {
-  return sightBetween(openHeldDoors(state, boardView(state)), from, to, losBlockers(state));
+export function gameLos(state: GameState, from: Cell, to: Cell, viewerId?: PlayerId): boolean {
+  return sightBetween(doorsAjar(state, viewerId, openedDoors(state, boardView(state))), from, to, losBlockers(state));
 }

 /** Parse an edge key back into its north/west cell and side. */
@@ -409,7 +428,7 @@ function casterLos(
  from: Cell,
  to: Cell,
 ): boolean {
-  const board = openHeldDoors(state, perceivedBoard(state, caster.id));
+  const board = doorsAjar(state, caster.id, openedDoors(state, perceivedBoard(state, caster.id)));
  const blockers = losBlockers(state);
  if (sightBetween(board, from, to, blockers)) return true;
  if (!displays(caster, "visionstone")) return false;
@@ -1306,7 +1325,7 @@ const CARD_EFFECTS: Record<string, AttackEffect | NeutralEffect | CounterEffect>
      if (cmd.target.playerId === caster.id) return "you are already your own buddy";
      const target = state.players.find((p) => p.id === (cmd.target as { playerId: PlayerId }).playerId);
      if (!target || !target.alive) return "no such living player";
-      if (!gameLos(state, caster.position, target.position)) return "no line of sight";
+      if (!gameLos(state, caster.position, target.position, caster.id)) return "no line of sight";
      // Effectively permanent: broken by the caster attacking the target.
      attachSustained(state, events, "buddy", caster.id, target.id, PERMANENT_TURNS);
      return null;
@@ -1474,14 +1493,14 @@ const CARD_EFFECTS: Record<string, AttackEffect | NeutralEffect | CounterEffect>
        const key = cellKey(cmd.target.cell);
        const creature = creatureAt(state, cmd.target.cell);
        if (creature) {
-          if (!gameLos(state, caster.position, cmd.target.cell)) return "no line of sight";
+          if (!gameLos(state, caster.position, cmd.target.cell, caster.id)) return "no line of sight";
          destroyCreature(state, events, creature, "dispel creation");
          events.push({ type: "creationDispelled", caster: caster.id, what: creature.kind });
          return null;
        }
        const content = state.squareContents[key];
        if (!content) return "nothing created there";
-        if (!gameLos(state, caster.position, cmd.target.cell)) return "no line of sight";
+        if (!gameLos(state, caster.position, cmd.target.cell, caster.id)) return "no line of sight";
        delete state.squareContents[key];
        events.push({ type: "creationDispelled", caster: caster.id, what: content.kind });
        return null;
@@ -1498,7 +1517,7 @@ const CARD_EFFECTS: Record<string, AttackEffect | NeutralEffect | CounterEffect>
        const target = state.players.find((p) => p.id === (cmd.target as { playerId: PlayerId }).playerId);
        if (!target || !target.alive) return "no such living player";
        if (target.id === caster.id) return "you cannot drag yourself";
-        if (!gameLos(state, caster.position, target.position)) return "no line of sight";
+        if (!gameLos(state, caster.position, target.position, caster.id)) return "no line of sight";
        if (isLockedInPlace(state, target.id)) return "they are locked in place";
        const from = target.position;
        dragToward(state, target, caster.position);
@@ -1507,7 +1526,7 @@ const CARD_EFFECTS: Record<string, AttackEffect | NeutralEffect | CounterEffect>
      }
      if (cmd.target?.kind === "cell") {
        const key = cellKey(cmd.target.cell);
-        if (!gameLos(state, caster.position, cmd.target.cell)) return "no line of sight";
+        if (!gameLos(state, caster.position, cmd.target.cell, caster.id)) return "no line of sight";
        const objects = state.groundObjects[key];
        const treasure = state.treasures.find((t) => t.position && cellKey(t.position) === key);
        if (objects && objects.length > 0) {
@@ -1584,7 +1603,7 @@ const CARD_EFFECTS: Record<string, AttackEffect | NeutralEffect | CounterEffect>
    resolve: (state, events, caster) => {
      for (const opp of state.players) {
        if (!opp.alive || opp.id === caster.id) continue;
-        if (!gameLos(state, caster.position, opp.position)) continue;
+        if (!gameLos(state, caster.position, opp.position, caster.id)) continue;
        if (isLockedInPlace(state, opp.id) || sustainedOn(state, opp.id, "medusa").length > 0) continue;
        retreatFromSight(state, events, opp, caster.position);
      }
@@ -1680,7 +1699,7 @@ const CARD_EFFECTS: Record<string, AttackEffect | NeutralEffect | CounterEffect>
      const creature = state.creatures.find((c) => c.id === (cmd.target as { creatureId: string }).creatureId);
      if (!creature) return "no such monster";
      if (creature.kind === "shadow" || creature.kind === "alter-ego") return "that is no monster";
-      if (!gameLos(state, caster.position, creature.position)) return "no line of sight";
+      if (!gameLos(state, caster.position, creature.position, caster.id)) return "no line of sight";
      const boost = cmd.params?.boost === "movement" ? "movement" : "life";
      if (boost === "movement") creature.movesPerTurn *= 2;
      else creature.maxDamage *= 2;
@@ -1882,7 +1901,7 @@ const CARD_EFFECTS: Record<string, AttackEffect | NeutralEffect | CounterEffect>
        (state.groundObjects[key] ?? []).length > 0 ||
        state.treasures.some((t) => t.position && cellKey(t.position) === key);
      if (!hasObject) return "there is nothing there to glue down";
-      if (!gameLos(state, caster.position, cmd.target.cell)) return "no line of sight";
+      if (!gameLos(state, caster.position, cmd.target.cell, caster.id)) return "no line of sight";
      state.gluedCells[key] = true;
      // "a duration equal to twice the NUMBER card played"
      const turns = magnitude.duration * 2;
@@ -1906,7 +1925,7 @@ const CARD_EFFECTS: Record<string, AttackEffect | NeutralEffect | CounterEffect>
        (state.groundObjects[key] ?? []).length > 0 ||
        state.treasures.some((t) => t.position && cellKey(t.position) === key);
      if (!hasObject) return "there is nothing there to lock up";
-      if (!gameLos(state, caster.position, cmd.target.cell)) return "no line of sight";
+      if (!gameLos(state, caster.position, cmd.target.cell, caster.id)) return "no line of sight";
      state.squareContents[key] = { kind: "safe", damage: 0, createdBy: caster.id };
      events.push({ type: "safeCreated", caster: caster.id, at: cmd.target.cell });
      return null;
@@ -1924,7 +1943,7 @@ const CARD_EFFECTS: Record<string, AttackEffect | NeutralEffect | CounterEffect>
      if (ka === kb) return "pick two different squares";
      if (state.gluedCells[ka] || state.gluedCells[kb]) return "glue holds it fast";
      if (state.squareContents[ka]?.kind === "safe" || state.squareContents[kb]?.kind === "safe") return "it is locked in a safe";
-      if (!gameLos(state, caster.position, a) || !gameLos(state, caster.position, b)) return "no line of sight";
+      if (!gameLos(state, caster.position, a, caster.id) || !gameLos(state, caster.position, b, caster.id)) return "no line of sight";
      const itemsA = state.groundObjects[ka] ?? [];
      const itemsB = state.groundObjects[kb] ?? [];
      const treasureA = state.treasures.find((t) => t.position && cellKey(t.position) === ka);
@@ -1987,7 +2006,7 @@ const CARD_EFFECTS: Record<string, AttackEffect | NeutralEffect | CounterEffect>
      if (cmd.target?.kind === "cell") {
        const key = cellKey(cmd.target.cell);
        if (state.squareContents[key]?.kind !== "stone") return "that is not a solid stone block";
-        if (!gameLos(state, caster.position, cmd.target.cell)) return "no line of sight";
+        if (!gameLos(state, caster.position, cmd.target.cell, caster.id)) return "no line of sight";
        delete state.squareContents[key];
        events.push({ type: "stoneTurnedToWater", caster: caster.id, at: cmd.target.cell });
        // "Solid stone block turns into a WATERWALL with a range and damage of 4."
@@ -2536,7 +2555,7 @@ const CARD_EFFECTS: Record<string, AttackEffect | NeutralEffect | CounterEffect>
      const other = state.players.find((p) => p.id === (cmd.target as { playerId: PlayerId }).playerId);
      if (!other || !other.alive) return "no such living player";
      if (other.id === caster.id) return "that is already your home";
-      if (!gameLos(state, caster.position, other.position)) return "no line of sight to them";
+      if (!gameLos(state, caster.position, other.position, caster.id)) return "no line of sight to them";
      const onHome = (home: Cell) =>
        state.treasures.filter((t) => t.position && cellKey(t.position) === cellKey(home)).length;
      if (onHome(caster.home) !== onHome(other.home)) {
@@ -2727,7 +2746,7 @@ function emptySquareTarget(
  if (state.dimWarps.some((w) => cellKey(w.a) === key || cellKey(w.b) === key)) {
    return "the warp shimmers there — nothing can form on it";
  }
-  if (!gameLos(state, caster.position, cell)) return "no line of sight";
+  if (!gameLos(state, caster.position, cell, caster.id)) return "no line of sight";
  return cell;
 }

@@ -3370,8 +3389,17 @@ function wallIgnoringDistance(board: AssembledBoard, from: Cell, to: Cell): numb
    const d = seen.get(cellKey(cur))!;
    if (d >= 8) break; // teleport range is 4; stop early
    for (const side of SIDES) {
-      const n = neighbor(cur, side);
-      if (!board.cells[cellKey(n)] || seen.has(cellKey(n))) continue;
+      let n = neighbor(cur, side);
+      if (!board.cells[cellKey(n)]) {
+        // The maze wraps for walkers; it wraps for teleporters too —
+        // a warp mouth is one step, same as any doorway.
+        const w = board.warps.find(
+          (w) => cellKey(w.from.cell) === cellKey(cur) && w.from.side === side,
+        );
+        if (!w) continue;
+        n = w.to.cell;
+      }
+      if (seen.has(cellKey(n))) continue;
      seen.set(cellKey(n), d + 1);
      if (cellKey(n) === cellKey(to)) return d + 1;
      queue.push(n);
@@ -3384,6 +3412,7 @@ function wallIgnoringDistance(board: AssembledBoard, from: Cell, to: Cell): numb
 // Setup

 export function createGame(config: GameConfig): { state: GameState; events: GameEvent[] } {
+  config = { ...config, deckRev: config.deckRev ?? CURRENT_RULES_REV };
  const n = config.playerIds.length;
  let rng = createRng(config.seed);
  const events: GameEvent[] = [];
@@ -3747,11 +3776,60 @@ function fearRepels(state: GameState, moverId: PlayerId | null, from: Cell, to:
    if (sustainedOn(state, other.id, "fear").length === 0) continue;
    const d = dreadDistance(board, other.position, to);
    const dBefore = dreadDistance(board, other.position, from);
-    if (d <= 3 && d < dBefore) return true;
+    if (d <= 3 && d < dBefore) {
+      // Approaching from outside the dread is never willing.
+      if (dBefore > 3) return true;
+      // Already caged inside it: the maze's corners may force a step
+      // that closes the crow-flies distance — permitted only when the
+      // step walks the shortest way OUT of the bubble.
+      const eFrom = escapeSteps(state, board, other.position, from);
+      const eTo = escapeSteps(state, board, other.position, to);
+      if (!(eTo < eFrom)) return true;
+    }
  }
  return false;
 }

+/**
+ * Walking steps (walls and shut doors respected, warp mouths crossed,
+ * fire braved) from `start` to the nearest cell beyond a dread bubble
+ * centered on `dreadFrom`. Infinity when no way out exists.
+ */
+function escapeSteps(state: GameState, board: AssembledBoard, dreadFrom: Cell, start: Cell): number {
+  if (dreadDistance(board, dreadFrom, start) > 3) return 0;
+  const passable = (cell: Cell, side: Side): Cell | null => {
+    const key = edgeKey(cell, side);
+    const e = board.edges[key] ?? "open";
+    if (e === "wall") return null;
+    if (e === "door" &&
+        !state.openDoorEdges.includes(key) &&
+        !state.heldDoors.some((h) => h.key === key)) return null;
+    let n = neighbor(cell, side);
+    if (!board.cells[cellKey(n)]) {
+      const w = board.warps.find(
+        (w) => cellKey(w.from.cell) === cellKey(cell) && w.from.side === side,
+      );
+      if (!w) return null;
+      n = w.to.cell;
+    }
+    if (state.squareContents[cellKey(n)]?.kind === "stone") return null;
+    return n;
+  };
+  const seen = new Set<string>([cellKey(start)]);
+  const queue: [Cell, number][] = [[start, 0]];
+  while (queue.length > 0) {
+    const [cur, d] = queue.shift()!;
+    for (const side of SIDES) {
+      const n = passable(cur, side);
+      if (!n || seen.has(cellKey(n))) continue;
+      if (dreadDistance(board, dreadFrom, n) > 3) return d + 1;
+      seen.add(cellKey(n));
+      queue.push([n, d + 1]);
+    }
+  }
+  return Infinity;
+}
+
 /** A blind wizard's wasted lurch into a wall still costs a movement point. */
 function blindBump(state: GameState, events: GameEvent[], p: PlayerState, direction: Side): CommandResult {
  state.turn.movementUsed++;
@@ -4316,7 +4394,7 @@ function doTestIllusion(prev: GameState, cell: Cell, side: Side): CommandResult
  if (wall.createdBy === p.id) return err("you made it — you know exactly what it is");
  if (wall.belief[p.id]) return err("your eyes have already ruled on that wall");
  const events: GameEvent[] = [];
-  const board = openHeldDoors(state, perceivedBoard(state, p.id));
+  const board = doorsAjar(state, p.id, openedDoors(state, perceivedBoard(state, p.id)));
  if (!isAdjacentToEdge(p.position, cell, side) &&
      !losToEdge(board, p.position, cell, side)) {
    return err("you cannot see that wall from here");
@@ -5089,8 +5167,8 @@ function checkAmbushes(
      sprung = context.pickedUpTreasure === true;
    } else if (context.movedFrom) {
      if (ambush.trigger.kind === "los") {
-        const before = gameLos(state, owner.position, context.movedFrom);
-        const now = gameLos(state, owner.position, actor.position);
+        const before = gameLos(state, owner.position, context.movedFrom, owner.id);
+        const now = gameLos(state, owner.position, actor.position, owner.id);
        sprung = now && !before;
      } else if (ambush.trigger.kind === "near") {
        const dist = (c: Cell) =>
@@ -5102,7 +5180,7 @@ function checkAmbushes(

    // The committed spell must be legal right now, or the ambush stays armed.
    const fx = CARD_EFFECTS[ambush.spell.cardId] as AttackEffect;
-    if (fx.requiresLos && !gameLos(state, owner.position, actor.position)) continue;
+    if (fx.requiresLos && !gameLos(state, owner.position, actor.position, owner.id)) continue;

    state.ambushes = state.ambushes.filter((a) => a.id !== ambush.id);
    state.discard.push(ambush.via, ambush.spell, ...ambush.numbers);
@@ -2,7 +2,7 @@
 // The server sends this after every state change; clients never see the
 // deck order or other players' hands.

-import { sightBetween, traceSight, type AssembledBoard, type Cell, type SightTrace } from "./board";
+import { SIDES, edgeKey, sightBetween, traceSight, type AssembledBoard, type Cell, type SightTrace } from "./board";
 import { cardDef, type CardInstance } from "./cards";
 import {
  boardView,
@@ -62,6 +62,8 @@ export interface GameView {
  /** Safes standing open (their combination entered this turn). */
  openSafes: string[];
  groundObjects: Record<string, CardInstance[]>;
+  /** The rules revision this game was dealt under. */
+  deckRev: number;
  doorStates: Record<string, "jammed" | "removed">;
  /** Accumulated attack damage per edge (public — cracks show). */
  wallDamage: Record<string, number>;
@@ -153,6 +155,7 @@ export function viewFor(state: GameState, playerId: PlayerId): GameView {
    groundObjects: Object.fromEntries(
      Object.entries(state.groundObjects).map(([k, v]) => [k, [...v]]),
    ),
+    deckRev: state.config.deckRev ?? 1,
    doorStates: { ...state.doorStates },
    wallDamage: { ...state.wallDamage },
    openDoorEdges: [...state.openDoorEdges],
@@ -202,11 +205,25 @@ export function sightedCellsFor(view: GameView): Set<string> {

 /** The board-as-seen and sight blockers this view's sight rules run against. */
 function sightBasis(view: GameView): { board: GameView["board"]; blockers: Record<string, true> } {
-  // Held-open doors are open doorways to the eye.
+  // Held-open doors are open doorways to every eye. Beyond them, the
+  // viewer at a door's threshold may pull it open and peek (rules rev 2):
+  // lock removed, door unlocked this turn, or PICK LOCK / MASTER KEY in
+  // hand — mirroring the engine's doorsAjar.
  let board = view.board;
-  if (view.heldDoorEdges.length > 0) {
+  const openKeys = new Set(view.heldDoorEdges);
+  const me = view.players.find((p) => p.id === view.you);
+  if (view.deckRev >= 2 && me?.alive) {
+    const carriesKey = view.yourHand.some((c) => c.cardId === "pick-lock" || c.cardId === "master-key");
+    for (const side of SIDES) {
+      const key = edgeKey(me.position, side);
+      if (board.edges[key] !== "door") continue;
+      const workable = carriesKey && view.doorStates[key] !== "jammed";
+      if (workable || view.doorStates[key] === "removed" || view.openDoorEdges.includes(key)) openKeys.add(key);
+    }
+  }
+  if (openKeys.size > 0) {
    const edges = { ...board.edges };
-    for (const k of view.heldDoorEdges) delete edges[k];
+    for (const k of openKeys) delete edges[k];
    board = { ...board, edges };
  }
  const blockers: Record<string, true> = {};
@@ -500,6 +500,28 @@ describe("zero-damage utility attacks", () => {
  });
 });

+describe("teleport wraps the maze's rim", () => {
+  it("four spaces counted through a warp mouth reach the far side", () => {
+    let { state } = newGame();
+    state = toRound2(state);
+    // Stand the active wizard at a wraparound mouth; the paired cell is
+    // ONE teleport step away, exactly as it is one walking step.
+    const active = activePlayer(state);
+    const warp = boardView(state).warps[0]!;
+    active.position = { ...warp.from.cell };
+    const tp = giveCard(state, active.id, "teleport", "TP", 0);
+    const r = applyCommand(state, active.id, {
+      type: "cast", instanceId: tp.instanceId,
+      target: { kind: "cell", cell: { ...warp.to.cell } },
+    });
+    expect(r.ok).toBe(true);
+    if (r.ok) {
+      const after = r.state.players.find((p) => p.id === active.id)!;
+      expect(cellKey(after.position)).toBe(cellKey(warp.to.cell));
+    }
+  });
+});
+
 describe("teleport as a counteraction", () => {
  it("the attack has no chance of hitting you — you are simply elsewhere", () => {
    let { state } = newGame();
@@ -720,4 +720,35 @@ describe("fear holds off monsters and unwilling feet alike", () => {
    expect(r.ok).toBe(false);
    if (!r.ok) expect(r.error).toContain("dread");
  });
+
+  it("a wizard caged inside the dread may round a corner to escape", () => {
+    let { state } = createGame({ playerIds: ["a", "b"], seed: 42, sets: ["basic", "expansion1"] });
+    const a = state.players.find((p) => p.id === "a")!;
+    const b = state.players.find((p) => p.id === "b")!;
+    pushSustained(state, {
+      id: "fx-fear", cardId: "fear", casterId: "b", targetId: "b",
+      remainingTurns: 5, data: {},
+    });
+    // b radiates dread from (2,5). a stands in a dead-end pocket at
+    // (2,3): walls on three sides, so the only way out steps SOUTH —
+    // closer to b — before the corridor east leads clear of the dread.
+    b.position = { x: 2, y: 5 };
+    a.position = { x: 2, y: 3 };
+    for (const side of ["N", "E", "W"] as const) {
+      state.edgeOverrides[edgeKey({ x: 2, y: 3 }, side)] = "wall";
+    }
+    state.edgeOverrides[edgeKey({ x: 2, y: 3 }, "S")] = "open";
+    state.edgeOverrides[edgeKey({ x: 2, y: 4 }, "E")] = "open";
+    state.edgeOverrides[edgeKey({ x: 3, y: 4 }, "E")] = "open";
+    state.edgeOverrides[edgeKey({ x: 4, y: 4 }, "N")] = "open";
+    while (state.players[state.turn.activeIndex]!.id !== "a") {
+      const r0 = applyCommand(state, state.players[state.turn.activeIndex]!.id, { type: "endTurn", draw: 0 });
+      if (!r0.ok) throw new Error(r0.error);
+      state = r0.state;
+    }
+    // The closer step is the only way out: permitted.
+    const r = applyCommand(state, "a", { type: "move", direction: "S" });
+    if (!r.ok) throw new Error("escape step refused: " + r.error);
+    expect(r.ok).toBe(true);
+  });
 });
@@ -445,7 +445,7 @@ describe("a held door is an open doorway to the eye", () => {
    expect(state.players.find((p) => p.id === pursuer)!.life).toBeLessThan(lifeBefore);
  });

-  it("an unheld unlocked door still blocks sight", () => {
+  it("an unlocked door is an open doorway to the wizard at its threshold", () => {
    let { state, cell, side, holder, pursuer } = sightRig();
    const pick = giveCard(state, holder, "pick-lock");
    state = must(state, holder, {
@@ -453,9 +453,56 @@ describe("a held door is an open doorway to the eye", () => {
      target: { kind: "edge", cell, side },
    });
    const fb = giveCard(state, holder, "fireball", "FB", 1);
-    const refused = applyCommand(state, holder, {
+    const cast = applyCommand(state, holder, {
      type: "cast", instanceId: fb.instanceId, target: { kind: "player", playerId: pursuer },
    });
+    expect(cast.ok).toBe(true);
+  });
+
+  it("a lock REMOVED lets any wizard beside the door peek through", () => {
+    let { state, cell, side, holder, pursuer } = sightRig();
+    const rm = giveCard(state, holder, "remove-lock");
+    state = must(state, holder, {
+      type: "cast", instanceId: rm.instanceId,
+      target: { kind: "edge", cell, side },
+    });
+    const fb = giveCard(state, holder, "fireball", "FB", 1);
+    const cast = applyCommand(state, holder, {
+      type: "cast", instanceId: fb.instanceId, target: { kind: "player", playerId: pursuer },
+    });
+    expect(cast.ok).toBe(true);
+  });
+
+  it("PICK LOCK in hand is enough to ease a locked door open a crack", () => {
+    let { state, cell, side, holder, pursuer } = sightRig();
+    giveCard(state, holder, "pick-lock");
+    const fb = giveCard(state, holder, "fireball", "FB", 1);
+    const cast = applyCommand(state, holder, {
+      type: "cast", instanceId: fb.instanceId, target: { kind: "player", playerId: pursuer },
+    });
+    expect(cast.ok).toBe(true);
+  });
+
+  it("the wizard down the hallway sees no further than the shut door", () => {
+    let { state, cell, side, holder, pursuer } = sightRig();
+    // Pull the pursuer one square further down the hall, so the door is
+    // no longer on their threshold; clear their path to the doorway.
+    const near = neighbor(cell, side);
+    const far = neighbor(near, side);
+    if (!boardView(state).cells[cellKey(far)]) return; // the maze ends here; geometry unavailable
+    state.players.find((p) => p.id === pursuer)!.position = far;
+    state.edgeOverrides[edgeKey(near, side)] = "open";
+    const rm = giveCard(state, holder, "remove-lock");
+    state = must(state, holder, {
+      type: "cast", instanceId: rm.instanceId,
+      target: { kind: "edge", cell, side },
+    });
+    state = must(state, holder, { type: "endTurn", draw: 0 });
+    const fb = giveCard(state, pursuer, "fireball", "FB", 1);
+    const refused = applyCommand(state, pursuer, {
+      type: "cast", instanceId: fb.instanceId, target: { kind: "player", playerId: holder },
+    });
    expect(refused.ok).toBe(false);
+    if (!refused.ok) expect(refused.error).toContain("line of sight");
  });
 });