Rev 9: REDIRECTION connects the exits you choose

Playtesting read the card right and the engine had it wrong. "Placing
the A tokens on one set of exits & the B tokens on the other" means
the two exits you mark BECOME a pair — and their former partners pair
with each other — not that the two exits trade destinations. Under
rev 9, click the exit and then the exit you want it to connect TO
(the hint now says so); already-connected exits are refused. Earlier
games keep the swap their logs were validated against. Test pins the
full four-way rewiring.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/engine/src/game.ts

@@ -2105,23 +2105,39 @@ const CARD_EFFECTS: Record<string, AttackEffect | NeutralEffect | CounterEffect>
   },
   redirection: {
     kind: "neutral",
-    // "Swap two external sector exits" — their wraparound destinations trade.
+    // "Signify their new directions by placing the A tokens on one set of
+    // exits & the B tokens on the other" — the two exits you choose become a
+    // pair (rules rev 9), and their former partners pair with each other.
+    // Earlier revisions swapped the two exits' destinations instead.
     resolve: (state, events, caster, cmd) => {
       const a = cmd.params?.cell;
       const bT = cmd.target;
-      if (!a || !bT || bT.kind !== "cell") return "pick the two exits to swap";
+      if (!a || !bT || bT.kind !== "cell") return "pick the two exits to connect";
       const b = bT.cell;
       const wa = state.board.warps.find((w) => cellKey(w.from.cell) === cellKey(a));
       const wb = state.board.warps.find((w) => cellKey(w.from.cell) === cellKey(b));
       if (!wa || !wb || wa === wb) return "pick two different outer exits";
-      // Swap destinations and fix the reciprocal warps to match.
+      if ((state.config.deckRev ?? 1) >= 9) {
-      const destA = { ...wa.to };
+        if (cellKey(wa.to.cell) === cellKey(wb.from.cell)) return "those exits already connect";
-      const destB = { ...wb.to };
+        const pa = state.board.warps.find((w) => cellKey(w.from.cell) === cellKey(wa.to.cell));
-      wa.to = destB;
+        const pb = state.board.warps.find((w) => cellKey(w.from.cell) === cellKey(wb.to.cell));
-      wb.to = destA;
+        // The chosen exits join (A tokens); their old partners join (B tokens).
-      for (const w of state.board.warps) {
+        wa.to = { cell: { ...wb.from.cell }, side: wb.from.side };
-        if (cellKey(w.from.cell) === cellKey(destA.cell)) w.to = { cell: { ...wb.from.cell }, side: wb.from.side };
+        wb.to = { cell: { ...wa.from.cell }, side: wa.from.side };
-        if (cellKey(w.from.cell) === cellKey(destB.cell)) w.to = { cell: { ...wa.from.cell }, side: wa.from.side };
+        if (pa && pb) {
+          pa.to = { cell: { ...pb.from.cell }, side: pb.from.side };
+          pb.to = { cell: { ...pa.from.cell }, side: pa.from.side };
+        }
+      } else {
+        // Legacy: swap destinations and fix the reciprocal warps to match.
+        const destA = { ...wa.to };
+        const destB = { ...wb.to };
+        wa.to = destB;
+        wb.to = destA;
+        for (const w of state.board.warps) {
+          if (cellKey(w.from.cell) === cellKey(destA.cell)) w.to = { cell: { ...wb.from.cell }, side: wb.from.side };
+          if (cellKey(w.from.cell) === cellKey(destB.cell)) w.to = { cell: { ...wa.from.cell }, side: wa.from.side };
+        }
       }
       events.push({ type: "exitsRedirected", caster: caster.id });
       return null;

packages/engine/test/casting.test.ts

@@ -769,3 +769,28 @@ describe("rules revision 8", () => {
     if (!r.ok) expect(r.error).toMatch(/warp shimmers/);
   });
 });
+
+describe("redirection (rules rev 9)", () => {
+  it("the two chosen exits connect; their old partners pair with each other", () => {
+    let { state } = createGame({ playerIds: ["alice", "bob"], seed: 42, sets: ["basic"], deckRev: 9 });
+    state = toRound2(state);
+    const me = activePlayer(state);
+    // Pick two exits that are NOT already partners.
+    const warps = state.board.warps;
+    const wa = warps[0]!;
+    const wb = warps.find((w) => cellKey(w.from.cell) !== cellKey(wa.from.cell) &&
+                                  cellKey(w.from.cell) !== cellKey(wa.to.cell))!;
+    const paCell = { ...wa.to.cell };
+    const pbCell = { ...wb.to.cell };
+    const rd = giveCard(state, me.id, "redirection", "RD", 0);
+    state = must(state, me.id, {
+      type: "cast", instanceId: rd.instanceId,
+      target: { kind: "cell", cell: wb.from.cell }, params: { cell: wa.from.cell },
+    });
+    const after = (from: Cell) => state.board.warps.find((w) => cellKey(w.from.cell) === cellKey(from))!;
+    expect(cellKey(after(wa.from.cell).to.cell)).toBe(cellKey(wb.from.cell));
+    expect(cellKey(after(wb.from.cell).to.cell)).toBe(cellKey(wa.from.cell));
+    expect(cellKey(after(paCell).to.cell)).toBe(cellKey(pbCell));
+    expect(cellKey(after(pbCell).to.cell)).toBe(cellKey(paCell));
+  });
+});

packages/server/src/rooms.ts

@@ -46,7 +46,7 @@ export interface Room {
 const rooms = new Map<string, Room>();
 
 /** Rules revision new games are dealt under (stored games keep their own). */
-const RULES_REV = 8;
+const RULES_REV = 9;
 
 const ROOM_CODE_ALPHABET = "ABCDEFGHJKLMNPQRSTUVWXYZ23456789";
 

packages/web/src/App.svelte

@@ -1282,7 +1282,9 @@
             {#if selectedCard?.cardId === "boobytrap"}
               <span>— place 4 tokens ({trapCells.length}/4; the first is real)</span>
             {/if}
-            {#if selectedCard && TWO_CELL_CARDS.has(selectedCard.cardId)}
+            {#if selectedCard?.cardId === "redirection"}
+              <span>{tradeFrom ? "— now the exit it should connect TO" : "— click the first exit"}</span>
+            {:else if selectedCard && TWO_CELL_CARDS.has(selectedCard.cardId)}
               <span>{tradeFrom ? "— now the second square" : "— click the first square"}</span>
             {/if}
             {#if selectedCard?.cardId === "rotate-sector"}

packages/web/src/local.svelte.ts

@@ -132,7 +132,7 @@ class LocalGame {
       seed,
       sets: expansion ? ["basic", "expansion1"] : ["basic"],
       ...(colors ? { colors } : {}),
-      deckRev: 8,
+      deckRev: 9,
     };
     const { state, events } = createGame(config);
     this.config = config;