claude (duplicate_chess)
5047ad7786
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
52 lines
2.7 KiB
Markdown
52 lines
2.7 KiB
Markdown
# Duplicate Chess
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> Local browser sandbox for "duplicate chess" — a four-player coupled-board chess variant.
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## Start Here
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**Read the latest handoff first:** `.claude/handoffs/` (most recent file).
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It has session state, in-progress work, and ordered next steps.
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Then check `IDEA.md` for the project brief, `DECISIONS.md` for settled choices, and
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`docs/superpowers/specs/2026-05-19-duplicate-chess-design.md` for the full design.
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## Project Identity
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A digitization of "duplicate chess," a four-player chess variant invented by Andrew
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Freiberg (Seth's father — also the inventor of the blind-chess variant behind the
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sibling `blind_chess` project). Four players (North, South, East, West) and four
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boards (NW, NE, SW, SE); each player controls one colour on two boards and must play
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the identical algebraic move on both. A captured piece leaves a frozen, capturable
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"ghost" twin on the player's other board. Every individual board always remains a
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legal game of orthodox chess.
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This project is a **local, single-operator sandbox/visualizer**: one screen, all four
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boards, an engine that enforces the synchronized-move coupling, renders ghosts, and
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detects the endgame. Its purpose is to let the variant be *seen* and studied — the
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inventor's own point is that it cannot be understood from prose alone.
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## Current State
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- **Phase:** v1 **implemented and merged to `main`** — the engine and the compass
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UI are complete. Not yet manually browser-tested.
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- **Repo:** `git.sethpc.xyz/Seth/duplicate_chess` (`main`).
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- **Deploy target:** n/a — runs locally (`pnpm install && pnpm dev`).
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- **Stack:** Vite + Svelte 5 + TypeScript, `chess.js`. Single package; engine in
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`src/engine/` (pure, DOM-free; 27 vitest tests passing), UI in `src/lib/`.
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- **Commands:** `pnpm dev` (run) · `pnpm build` · `pnpm test` (engine) ·
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`pnpm exec svelte-check --tsconfig ./tsconfig.json` (typecheck).
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- **Known follow-ups (not blocking):** interactive browser test still pending (a
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human task — `svelte-check` + manual is the design, see spec §8); history scrubbing
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is view-only whereas spec §4.3 says truncate-on-move (deviation — confirm which to
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keep); `deserialize` trusts the `player` field on replay; move log has no round
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numbers. See the latest handoff in `.claude/handoffs/`.
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## Conventions
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- Inherits homelab conventions from `~/bin/CLAUDE.md` (gitea CLI, conventional
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commits, `.claude/handoffs/` for session state).
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- The engine (`src/engine/`) is DOM-free and the single source of truth for game
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state. The UI never computes legality itself.
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- Provisional endgame rules are marked PROVISIONAL in the spec — they are Claude's
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chosen defaults, not Andrew's rulings. Flag them if revisited.
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