Standard chess plus a growing collection of custom game modes that bend the rules or the engine.
Stockfish gets sad and loses Elo every time it loses a piece. Trade pieces to demoralize the engine.
Stockfish starts starving and weak — but every capture or check it delivers feeds its rating. Deny it food and blows.
Stockfish loses Elo every time you play its best move. Punish the engine for its own brilliance.
Stockfish starts as a beginner and learns fast — gaining Elo after every move it plays. Crush it early or face a grandmaster by the endgame.
Stockfish panics and loses Elo every time it gets put in check. Keep the pressure on to melt its rating.
Stockfish starts sharp but tires out — losing Elo after every move it plays. Outlast it and the endgame is yours.
Stockfish plays at full strength — but every move has a chance to blunder. Wait for the slip and pounce.
Stockfish plays for a draw instead of the win — steers every move toward equality.
CopyFish must reply with the same type of piece you just moved — bishops and knights are interchangeable. If it has no matching piece, it plays the best move.
The bot's entire back rank is bishops (except the king). You play a normal setup — good luck against the swarm.
The bot's entire back rank is knights (except the king). You play a normal setup — brace for the cavalry charge.
Got an idea for a gimmick? Send it our way and we might build it next.