Import a game and let Stockfish show you the best moves and your mistakes. Then train with puzzles or play a human-like bot to put it into practice.
Analyze a gameReview a game, train your tactics or take on a human-like bot, all in one place.
Import any game and step through it with live Stockfish evaluation and best-move arrows on every position.
Sharpen your tactics with an endless stream of rated puzzles drawn from real games.
Take on a bot that plays like a real human at the rating you choose, then analyze the result instantly.
Tools that turn Stockfish's numbers into moves you can see on the board and mistakes you can learn from.
Color-coded arrows draw the best moves straight onto the board, ranked by the engine.
Accuracy for both players, brilliant moves marked in teal, and every best move, inaccuracy, mistake and blunder.
See how often each opening move is played and the win, draw and loss rates behind it.
Quiz yourself against the engine's choice and find out instantly whether you'd have found it.
Show every legal move and its evaluation at once to see the whole tactical picture.
Rated tactical puzzles from real games, ready whenever you want a quick training session.
Work through interactive chess puzzles drawn from real games to build pattern recognition and calculation. Stuck on one? Show the solution, then open the puzzle on the analysis board in a single click. There are also daily chess puzzles: an easy, a medium and a hard one each day, the same for everyone. Each difficulty keeps its own streak.
Solve puzzles now · Today's daily chess puzzle
Put what you've learned into practice against a bot that plays like a real person at the rating you choose, instead of a flawless engine. When the game is over, send it straight to the analysis board to see where it was won or lost.
Guides to the openings you keep meeting and the tactics that decide your games. Each one links to the board so you can try it straight away.
What the Sicilian, French, Ruy Lopez, Queen's Gambit, London System and other openings are trying to do, and the plans that follow.
Learn forks, pins, skewers, discovered attacks and back rank mates, then drill each pattern on rated puzzles.
Paste a game from Chess.com, Lichess or a PGN and find the move that actually lost it.
Open the board and start analyzing in seconds. It's free, with no account and nothing to download.
Yes. The analysis board, the Stockfish engine, the opening explorer, the puzzles and the bots are all free to use, with no account and nothing to install. A paid tier adds faster, multi-threaded engines, but nothing described on this page needs it.
No. Open the board and start analyzing. An account is only useful if you want your games and your daily puzzle streaks saved across devices.
Stockfish, the strongest open-source chess engine, compiled to WebAssembly so it runs inside your browser rather than on a shared server. Your analysis never waits in a queue behind other users.
Yes. Paste the game's link from Chess.com or Lichess, or its PGN, and run the free game review. Stockfish grades every move and marks each inaccuracy, mistake and blunder for both sides. You don't need a password or to link an account.
Yes. Everything runs in the browser, so it works on phones and tablets as well as desktops, even on computers where you can't install software.
Turn the board so each player has a light square in the bottom-right corner. The rooks go in the corners, then the knights, then the bishops, with the queen on her own color and the king beside her; the pawns fill the rank in front. The chess board setup guide shows it square by square next to a board, and its editor sets up any other position to analyze or play.