Chess puzzle trainer
Chess Puzzle Trainer — Solve a Real Blunder
This is the real Audit Chess board, running Stockfish in your browser. Find the move that was missed in an actual game - get it wrong and you drop onto a free analysis board with a live eval bar, exactly like the app. No account, nothing uploaded.
How the puzzle trainer works
Step 1
Find the move
The position comes from a real game where a player blundered. It is your turn: find the strongest move, the one that was missed. Stockfish checks your answer instantly.
Step 2
Miss it? Explore why
A wrong move opens a free analysis board with a live eval bar. Try any line you like and watch the evaluation change, so you see exactly why the move you chose falls short.
Step 3
Get puzzles from your own games
In the full app, every blunder and missed tactic from your own Lichess or Chess.com history becomes a puzzle like this one, so you practise the mistakes you actually make.
Want more? Read how to stop blundering or see how puzzles from your own games are built.
Frequently asked questions
Where does this puzzle come from?+
It is taken from a real online game in which one side missed a winning move. The solution line is generated and verified by Stockfish, the same way Audit Chess builds puzzles from your own games.
Is the demo really running Stockfish?+
Yes. Stockfish runs as WebAssembly inside your browser tab. Nothing is sent to a server, and it works without an account.
How are puzzles from my own games different from normal puzzle sites?+
Puzzle sites serve random positions from other people's games. Audit Chess builds puzzles only from positions you actually reached and misplayed, so each one targets a pattern you have already shown you miss.
Enter your Lichess or Chess.com username and get puzzles from every blunder you’ve played.