The technology behind BobbyChess.

DeepSquare develops chess and analysis technology. BobbyChess brings it to life: play for free, explore historic games and take your own games away as PGN. Fischer’s opening moves meet DeepSquare’s chess core—historical book moves are checked before play.

Play Bobby now Back to BobbyChess

More characters on DeepSquare ↗ – each with its own playing style.

Engine lab

Search architecture, analysis and controlled development—the technical foundation stays explainable.

Open historical data

Openings: Chess Database · Ana L. Schaigorodsky ↗, CC BY 4.0. Filtered and transformed into era books for BobbyChess.

Coming to DeepSquare

More characters with their own style, and explanations of why a move is good.