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The boobytrap keeps its secret

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The public boobytrapPlaced event and every subsequent view shipped
the four token cells in casting order — with the real trap always
first, a tell readable by any client. Tokens are now stored and
broadcast in canonical cell order while the truth lives only in
realKey (and the caster's private event). Deterministic sort, no rng
touched, replays unaffected; a test casts in reverse order and checks
that position whispers nothing.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015RCWSTnb1KYTPyL4GmhGnF
This commit is contained in:
Eric Wagoner
2026-08-29 00:21:02 -04:00
co-authored by Claude Fable 5
parent 8ba0a934cc
commit eaa672236b
2 changed files with 38 additions and 2 deletions
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packages/engine/src/game.ts
+7 -2
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@@ -2013,8 +2013,13 @@ const CARD_EFFECTS: Record<string, AttackEffect | NeutralEffect | CounterEffect>
}
const uniq = new Set(cells.map(cellKey));
if (uniq.size !== 4) return "the four tokens go on four different squares";
state.boobytraps.push({ casterId: caster.id, cells: [...cells], realKey: cellKey(cells[0]!) });
events.push({ type: "boobytrapPlaced", caster: caster.id, cells: [...cells] });
// The FIRST cell in the command is the real trap — but that truth
// lives only in realKey. Stored and broadcast in canonical order,
// the tokens carry no tell: position must never whisper which one
// bites (the placement order once did, to anyone reading events).
const laid = [...cells].sort((a, b) => cellKey(a).localeCompare(cellKey(b)));
state.boobytraps.push({ casterId: caster.id, cells: laid, realKey: cellKey(cells[0]!) });
events.push({ type: "boobytrapPlaced", caster: caster.id, cells: laid.map((c) => ({ ...c })) });
events.push({ type: "boobytrapPlacedPrivate", visibleTo: caster.id, realCell: cells[0]! });
return null;
},