what’sthisposition: free game review for Chess.com

Review a finished Chess.com game on your computer: accuracy and every move labelled, from Brilliant to Blunder. Free, open source.

Finished a game on Chess.com? Click the what’sthisposition button and get a full game review for free, on your own computer: both players’ accuracy and every move labelled, from Brilliant to Blunder. HOW IT WORKS 1. Finish a game on Chess.com, or open one of your past games. 2. Click the what’sthisposition button in the toolbar, then “Review this game”. 3. A card opens next to the board. Press “Analyze this game” and Stockfish reviews it on your computer, usually in about a minute. 4. Want the details? “See every move explained” opens the full review on whatsthisposition.com, ready at once: nothing is searched twice. Tip: pin the extension (the puzzle-piece icon, then the pin) so its button is always in the toolbar. 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 ON THE WEBSITE (free, no account) • Every move explained in plain words: why a sacrifice is brilliant, what a mistake allows and what was better • Try your own moves from any position: the new line is analysed and labelled too • Deep-analyse any position: strengths, weaknesses, threats and plans for both sides, shown on the board • Opening names and theory from over a million games between strong players • Also reviews Lichess games and any PGN, and reads positions from screenshots FAIR PLAY The extension does nothing until you click it, and 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. PRIVATE BY DESIGN • Stockfish 19 runs on your computer. Your games aren’t uploaded anywhere. • The extension collects no data. No account, no sign-in, no ads. • It works only on Chess.com, and only when you click its button. • The link to the full review carries the game in the part of the address that browsers never send to a server. The website only counts visits, anonymously and without cookies. FREE AND OPEN SOURCE No subscription and no limits. The code is on GitHub under the GPL-3.0 licence: https://github.com/acunli/whatsthisposition Works in Chrome, Edge, Brave, Arc, Opera and other Chromium browsers. what’sthisposition is an independent project. It isn’t affiliated with or endorsed by Chess.com.