The free online chess analysis board powered by Stockfish
Import a game and let a world-class engine reveal the best moves and your mistakes - then train with puzzles or play a human-like bot to put it into practice.
Three ways to get better
Whether you want to review a game, train your tactics, or take on a human-like bot - it's all here.
Analyze
Import any game and step through it with live Stockfish evaluation and best-move arrows on every position.
Open the board →Puzzles
Sharpen your tactics with an endless stream of rated puzzles drawn from real games.
Start solving →Play
Take on a bot that plays like a real human at the rating you choose, then analyze the result instantly.
Play a bot →Everything you need to understand a position
Powerful analysis tools that turn raw engine output into insight you can actually use.
Visual indicators
Colour-coded arrows draw the best moves straight onto the board, ranked by the engine.
Game report
A full breakdown of every best move, inaccuracy, mistake and blunder for both players.
Opening explorer
See how often each opening move is played and the win, draw and loss rates behind it.
Guess the move
Quiz yourself against the engine's choice and find out instantly whether you'd have found it.
Explode the position
Visualise every candidate move and its evaluation at once to see the whole tactical picture.
Endless puzzles
Rated tactical puzzles from real games, ready whenever you want a quick training session.
Train your tactics with free puzzles
Work through interactive chess puzzles drawn from real games to build pattern recognition and calculation. Stuck on one? Open it on the analysis board in a single click.
Solve puzzles now
Play a human-like bot
Put what you've learned into practice against a bot that plays like a real person at the rating you choose - not a flawless engine. When the game is over, send it straight to the analysis board to see where it was won or lost.
Play a botLearn the game, not just the moves
Guides to the openings you keep meeting and the tactics that decide your games - each one linked to the board so you can try it immediately.
Chess openings
The Sicilian, French, Ruy Lopez, Queen's Gambit, London System and more - what each one is trying to do and the plans that follow.
Tactics and puzzles
Forks, pins, skewers, discovered attacks, back rank mates - learn the pattern, then drill it on endless rated puzzles.
Analyse your games
Import from Lichess, Chess.com or a PGN and find the move that actually lost the game.
Frequently asked questions
Is Chess Compass free?
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. There is a paid tier for heavier use, but nothing described on this page requires it.
Do I need to create an account?
No. Open the board and start analysing. An account is only useful if you want your games saved across devices.
Which chess engine does the analysis use?
Stockfish - the strongest open-source chess engine - compiled to WebAssembly so it runs inside your browser rather than on a shared server. Nothing is queued behind other users, and your positions stay on your device.
Can I import my games from Chess.com or Lichess?
Yes. Enter your username and pick a game from your recent history, or paste a PGN directly. No password or account linking is needed.
Does it work on a phone?
Yes. Everything runs in the browser, so it works on phones and tablets as well as desktops - including on machines where you cannot install software.
Ready to find your best move?
No account needed, nothing to download. Open the board and start analyzing in seconds - completely free.
Analyze a game