Free · no signup · runs in your browser
Play chess against a real engine.
A handcrafted chess engine running entirely in your browser. No account, no server, just you and the machine.
Everything runs on your device — the engine, the analysis and the puzzle checking. There is no account to create and no game data leaves your browser. Choose a colour, pick a strength from quick to forge, and the Engine Room shows the evaluation and the line it expects while you play.