# Backgammon Cube (BGCube)

> Modern bilingual (FR/EN) backgammon club-house: play the AI, a friend on the same screen, online matches, or a real board with phone companion — with world-class GNU Backgammon analysis running in the browser. Published by BGCube Brussels.

## Key features
- Local GNU Backgammon engine (WebAssembly in a Web Worker): Expert AI and per-move PR (Performance Rating) analysis, no server-side evaluation.
- Cubeful doubling advice (Janowski model) shared by the AI, the Coach and match reports.
- Fair dice: cryptographic RNG with server commitment (SHA-256) and post-match audit; manual dice for physical boards.
- Match reports: checker/cube error matrix, replay, Career PR and Form PR over the last 1,000 decisions, PR history chart.
- AI Coach debrief written like a club coach, plus "Why?" explanations.
- Training: thousands of GNUbg-verified puzzles by theme, adaptive Pip Count Trainer.
- Table companion mode: two phones around a real board, mirrored views, live PR.
- Clubs: club pages, member pricing, rankings (three distinct Elo ratings: AI, Competition, Club/Federation).
- .mat export for Pass subscribers (XG / GNUbg / BGBlitz compatible).
- Virtual currency "Gams" (no cash-out); unlimited access with the Pass.

## MCP (Model Context Protocol)
- Endpoint: https://backgammoncube.com/mcp (OAuth-protected; metadata at /.well-known/oauth-protected-resource)
- Tools: get-leaderboard (public ranking), get-my-matches (signed-in user's match history and PR), get-my-profile (signed-in user's profile, Elo and club)

## Pages
- App & instant guest play: https://backgammoncube.com/
- Rules: https://backgammoncube.com/regles
- FAQ, glossary & user guide: https://backgammoncube.com/faq
- Training & puzzles: https://backgammoncube.com/entrainement
- Clubs: https://backgammoncube.com/clubs