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 botReady to find your best move?
No account needed, nothing to download. Open the board and start analyzing in seconds - completely free.
Analyze a game