Local engine, hot-seat, and online play — no servers. Full rules with castling, en passant, promotion; an alpha-beta engine with four strengths, eval bar, and hints.
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What is Chess?
A complete chess implementation that runs entirely in your browser. The rules engine covers castling, en passant, promotion, check/checkmate/stalemate, and draws (50-move, insufficient material, threefold repetition), with full SAN move notation. Play hot-seat on one device, against a built-in alpha-beta engine (four strengths from Beginner to Brutal, running in a Web Worker so the UI never freezes) with a live evaluation bar, candidate lines, and move hints — or online against a friend over an encrypted peer-to-peer connection using a share-code (our relay only brokers the connection; moves flow device-to-device). Drag or tap to move, scrub the move history, flip the board, undo, and resign. No accounts, no analytics, works offline.
