Your chess games, understood.

Build a personal library from Chess.com, Lichess, or PGN. Find the turning point with Stockfish, ask Cassia why the move failed, then explore and simulate a better continuation.

One connected review loop

The engine gives a verdict. Cassia helps explain it.

Collect

Bring games from Chess.com, Lichess, or a local PGN into one personal library.

Analyze

Run Stockfish in your browser and move directly to the moments that changed the game.

Understand

Ask Cassia about the missed threat, weakened structure, or idea behind the engine move.

Try again

Explore another move or simulate the continuation without losing your place in the game.