Border Chess

Border Chess is chess with room to breathe.

The board is 10×10: standard FIDE chess on the inner 8×8, plus one empty square on every side. Kings, queens, and edge pawns can use the border for extra maneuvering — same rules you know, with new tactical possibilities.

PLAY VS BOT Challenge Fairy-Stockfish, tuned for the border board. Choose your difficulty and improve your game against a strong computer opponent.

PLAY WITH FRIEND Pass-and-play on one iPhone. The board automatically flips each turn so both players see the game from their side.

BUILT FOR CHESS PLAYERS • Standard rules: castling, en passant, promotion, check, checkmate, stalemate, 50-move rule • Legal move hints, last-move highlight, and check highlight • Clean, modern board inspired by chess.com • Portrait mode, optimized for iPhone

NO ONLINE MULTIPLAYER (YET) v1 is offline on your device — bot mode and local two-player only. No account required.

OPEN SOURCE Border Chess is free software under the GNU GPL v3. Source code and license: https://github.com/sahasrarjn/chess-app

The bot engine uses Fairy-Stockfish (GPL v3). Chess piece artwork from the Lichess Maestro set.

Play in your browser too: https://chess-engine.sahasraranjan.workers.dev/play/