Engine: vendored fairy-stockfish-nnue.wasm. Rules: vendored ffish.
Requires COOP/COEP headers for SharedArrayBuffer. Space = play best, ←/→ ply, F flip, E engine.
Engine not running.Board + legal moves still work via ffish when rules loaded. See README for nginx COOP/COEP headers.
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Set up position
To move
Castling
Pick a piece, then click squares to place it (click the same piece again to remove it). Shift-click or right-click clears a square. Drag pieces to move them, or drag them off the board to remove them.