Chess.com game review, right on the game page.

The free extension reviews a finished Chess.com game right where you played it: both players' accuracy and every move counted, from Brilliant to Blunder. One more click opens the whole review here, already done.

  1. Finish a game on Chess.com, or open one of yours.
  2. Click the extension's button and press Analyze. Stockfish reviews the game on your computer.
  3. See every move explained opens it here, step by step.
Add to Chrome, it's free

For Chrome, Edge, Brave and other Chromium browsers on a computer. It only reviews finished games, and collects nothing.

The extension's card on Chess.com after a game: both players' accuracy, the opening, and how many moves of each kind each player made

What it does

In the card

  • Accuracy for both players
  • How many Brilliant, Great, Best, Excellent, Good, Book, Inaccuracy, Mistake, Miss and Blunder moves each player made
  • The opening, by name and ECO code
  • Three depths: Fast, Standard and Thorough

Every move explained, one click away

See every move explained opens the full review on this site with the work already done: nothing is searched twice. There every move is explained, you can try your own moves, and any position opens for a deeper analysis.

Private

Stockfish 19 runs on your computer and the extension collects nothing. It works only on chess.com, and only when you click its button. The link to the full review carries the game after the # in the address, a part browsers never send to a server. Privacy in full.

Install it

  1. Click Add to Chrome, then Add extension.
  2. Pin it: click the puzzle-piece icon in the toolbar, then the pin next to what’sthisposition.
  3. Finish a game on Chess.com, click the button and choose Review this game, then Analyze this game in the card.

Questions

About the extension.

Does it work during a game?

No. It only reviews games that are over: Chess.com's own game data decides, so a game in progress is never analysed. It's the same as reviewing a game on Chess.com afterwards.

Which browsers does it work in?

Chrome, Edge, Brave, Arc, Opera and other Chromium browsers on a computer. Firefox, Safari and phones aren't supported; on a phone, enter your username on this site instead.

Can it review my older games?

Yes. Open any of your finished games on Chess.com and click the extension's button.

Does the extension cost anything?

No. No subscription, no limits and no ads. The code is open source under the GPL-3.0 licence.