Luny: play a human-like chess AI at your level

A human-like chess AI, built on Maia

Luny runs Maia3, an open-source chess engine from the CSSLab research group at the University of Toronto, made to play like a person. It learned from human games to predict the move a player of a given rating would make, so Luny plays the moves, the plans and the mistakes of players at your level. It runs unmodified, and its source is on our licenses page.

At your level

Luny has a rating of its own for you: your Luny rating starts from your rating in your games and moves with every game you finish. Luny plays to it. That makes games against Luny feel like games against people, not a wall that never blunders. The rating guides how Luny plays; it isn't a promise of strength.

Practise any opening

Pick the opening for your next game, from the Italian Game to the Caro-Kann, or search for any named line, and Luny plays it with you. Leave the line and Luny takes over with its own moves, just as an opponent at the club would.

Its style, your choice

Attacking, balanced or solid; trading pieces, balanced or keeping them on. It's a gentle lean: Luny still plays its own human moves, a bit more often the kind you asked for.

Play on from your own games

Your training plan sets up positions from your own games: a win that slipped away to finish, a tough position to save. Luny has the whole game behind it, and plays on from there.

Every game, analysed

Games are saved as you play, so you can come back to them. Once a game is over, open it on the analysis board with Stockfish, and ask the coach about it.