Blunder Trainer

Practice mistakes from your own Lichess games. Sign-in is required; during beta, availability is shown in the main navigation.

Prepare your cards

Import your games through Explore first. Extract Blunders scans saved games that already have Lichess computer analysis. It finds large drops in evaluation and looks for a known solution.

Positions without a known legal solution are counted separately and do not enter the review queue. Cloud evaluation is not available for every position; extraction can be repeated later to fill missing solutions without resetting existing learning progress.

Train

1. Start a review session. 2. Play your proposed move on the board, or choose Show Solution. 3. For a promotion, choose Queen, Rook, Bishop or Knight. 4. Compare your move with the known solution. 5. Choose Again, Hard, Good or Easy to describe how well you remembered it.

The move feedback compares against one known solution, rather than running a new engine search. Your self-rating determines the next repetition date.

Saved progress

The card's new schedule and its rating history are saved together. A failed save shows an error and leaves the card on screen. A repeated submission of a card that is no longer due is rejected. Signing out does not erase your cards.

Limits

The trainer uses precomputed Lichess analysis and cloud evaluations. It does not create new engine analysis. Importing more analyzed games can make additional cards available.