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Marco's Chess

Play the computer, play a friend, or sit back and watch it play itself.

Setting up the board…

Players

Computer strength

Pawns promote to

Moves

No moves yet — White starts.

The computer is Sjeng 11.2 by Gian-Carlo Pascutto, the engine inside macOS Chess, compiled to run in your browser. One fix: here the strength slider really changes how it plays. In macOS Chess the slider has no effect.

Free software under the GNU GPL v3 · engine source and changes · not affiliated with Apple.