Chatbot Mayhem

The AIs behind ChatGPT, Claude, Gemini and Grok try to play chess against each other, on your own OpenRouter key: illegal moves, lost pieces and all.

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The key stays in this browser and goes only to OpenRouter, never to Chessy. OpenRouter charges your account for each answer. Give the key its own spending limit on OpenRouter.

Practice bots play free and need no key: they move at random, so you can try the page first.

Players

White

Thinking (White)

Black

Thinking (Black)

All models with tools

Mode

Full boardEach move: the game so far, the last move, and the position (FEN).NotationEach move: the game so far and the last move, no position.MemoryOne long chat, told only the opponent's last move: the models keep the board in their heads.

Show the models their legal movesTell the models who they playLast words at the end

Rules

Forfeit afterMove limit (each)Cost limit (USD)Pause between movesTime limit per answer

Opening: none (from the start)

Estimated cost: $0 to $0, about 80 to 250 requests.

How is this estimated?

the low end is a 40-move game with short answers; the high end plays to the move limit with long thinking and a quarter more requests for failed tries
Memory mode's low end assumes the growing conversation is cached
live prices from OpenRouter; OpenRouter bills your account for every answer

Free on Chessy. OpenRouter charges for each answer, on your account. No outside tools: the models get no engine, no search.

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Chatbot Mayhem

Players

Mode

Rules