claude (duplicate_chess)
9611c0ae0e
Local browser sandbox for "duplicate chess" — a four-player coupled-board chess variant invented by Andrew Freiberg. Scaffold per CREATE_PROJECT.md plus the approved design spec from this session's brainstorming. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
45 lines
2.1 KiB
Markdown
45 lines
2.1 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:** spec complete; implementation not started.
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- **Repo:** `git.sethpc.xyz/Seth/duplicate_chess`.
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- **Deploy target:** n/a — runs locally (`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, vitest-tested), UI in `src/lib/`.
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- **Next:** implementation plan via the writing-plans skill, then build.
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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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