Chess Variants
Chess-based games with modified rules, boards, or pieces.
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Lichess
Free, open-source online chess platform with zero ads, zero paywalls, and a full suite of play and training tools.
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PyChess
Free, open-source online chess server supporting over 60 chess variants alongside standard chess.
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PlayStrategy
Open-source strategy game server supporting chess variants alongside draughts, Go, Backgammon, Othello, and more.
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The Chess Variants Pages
Comprehensive encyclopedia of chess variants with rules, history, and links to playable implementations.