Free chess game review & analysis for Chess.com · what’sthisposition

Free, unlimited chess game review for Chess.com. Finish a game and a review card pops up next to the board: Stockfish 19 analyses it on your own computer, with both players’ accuracy and every move labelled, from Brilliant to Blunder. No account, no daily limit, no ads. HOW IT WORKS 1. Play a game on Chess.com. When it ends, a card opens next to the board. 2. Press “Analyze this game” and Stockfish reviews it on your computer, usually in about a minute. 3. Want the details? “See every move explained” opens the full review on whatsthisposition.com, ready at once: nothing is searched twice. For a past game, open it on Chess.com and click the what’sthisposition button in the toolbar, then “Review this game”. The same button can turn the automatic card off. 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 moves of each kind each player made, from Brilliant to Blunder • The opening, by name and ECO code • Three depths: Fast, Standard and Thorough ON THE WEBSITE (free, no account): https://www.whatsthisposition.com • 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 analyses a single position from a screenshot or a FEN FAIR PLAY The card opens only once a game is over: when Chess.com shows the result, or its own game data says the game is finished. Nothing is analysed until you press Analyze, 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, where it looks at the game on the page to know when it ends. • 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 and other Chromium-based browsers on a computer. what’sthisposition is an independent project. It isn’t affiliated with or endorsed by Chess.com.