Your chess, made clear

See the game.
Find the lesson.

Import completed Chess.com games, replay every move, test ideas on the board, and train the patterns that keep returning.

Example insightYour loose pieces were punished in three games.A personal puzzle is ready.

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Completed games only

One place to review, explore, and improve

Built from your own completed Rapid and Blitz games.

Review freely

Replay the game.

Move back and forth at your pace, reset the board, and return to any position you want to understand.

Understand the moment

See key moments.

Try another line, then compare it with Stockfish’s stronger move, the opening played, and the evaluation swing.

Train what repeats

Train personal puzzles.

Study repeated themes across openings, middlegames, and endgames, all taken directly from your games.

Your games decide what comes next.

Blunderbase looks across your recent play for repeated mistakes and turns them into a focused training library. You can still browse openings, middlegames, and endgames whenever you want.

Open the example review

OpeningScandinavian Defense

Repeated patternLoose pieces

Suggested nextPersonal positions and centre control

Private training, fair play.

Games, mistakes, practice history and reports are readable only by the account that owns them. Blunderbase never assists with an active game.