Chess Book

Chess Book

Train on chess.com with a line that matches your level.

Live Stockfish analysis in your games — Elo-limited suggestions for playable ideas, full-strength eval and ratings for honest feedback.

Add to Chrome See what’s inside

Built for the game you’re already playing.

Chess Book overlays on chess.com — no new board app, no export ritual.

Elo-limited engine line

Set an Engine Elo Limit so the suggested line stays near human strength. You get ideas you can actually follow — not only engine perfection.

Full-strength truth

Eval bar, move ratings, and post-move feedback still use unrestricted Stockfish, so you know what was objectively best even when the line suggested something else.

Live on your turn

Analysis runs when it’s your move: board arrows, a clear principal line, and an eval strip that updates with the real assessment.

Ratings & feedback

After you move, see Brilliant-to-Blunder style ratings and a feedback arrow comparing your choice to the true best move.

How it fits your session

Launch once, then stay inside chess.com.

  1. 01

    Install & launch

    Open the Chess Book popup, launch the sandbox companion, start a game on chess.com.

  2. 02

    Tune depth & Elo

    Pick engine depth for strength/speed, and optionally limit the suggested line to an Elo target.

  3. 03

    Play with a coach on the board

    Read the line, watch the eval, then learn from ratings and feedback after each of your moves.

Ready when your next game is.

Chess Book is a Chrome extension for chess.com — Stockfish-backed analysis with human-scaled suggestions and full-strength review.

Add to Chrome

Chrome Web Store link coming soon — package the extension locally from the Chess Book repo today.