Free tool
Find your chess weaknesses
You already know your weaknesses are in your games - the problem is spotting them across hundreds of them without bias toward the losses you happen to remember. Audit Chess reads your whole Lichess or Chess.com history with Stockfish and ranks your weaknesses by how many points each one actually costs you. Free, in your browser, no account.
The four that cost the most
Weaknesses are ranked by lost points, not drama. These are usually where the rating goes:
Openings that lose
Every opening ranked by your real win/draw/loss record, so the line hiding a 30% score inside a respectable rating finally stands out.
Opening analyzer →Mistakes you repeat
Not one-off blunders but the same oversight across many games - the pattern that actually predicts your next loss.
Recurring weaknesses →Wins you throw away
Games you were winning by +3 and lost anyway, split by whether it slipped in the opening, middlegame or endgame.
Blown wins →Endgames you misplay
How you handle rook, minor-piece and pawn endings - the quiet phase where a lot of rating leaks away unnoticed.
Endgame analysis →Frequent beats memorable
The blunder you still wince about was probably a one-off. The weakness worth fixing is the boring one you never notice: the sideline you score badly in every week, the same endgame technique you fumble, the winning position you relax in. None of those feel urgent, which is exactly why they persist. Measuring them across your whole history - rather than trusting memory - is the only reliable way to find them.
For the full walk-through, read how to find your chess weaknesses and how many games it takes to spot a pattern.
A weakness you can’t drill isn’t actionable
Finding a weakness is only half the job. Audit Chess turns the mistakes it finds into puzzles from your own games and flags the forced mates you missed, so the thing you just discovered becomes the thing you practise. Want a narrower cut first? Run the blunder analyzer or a full game analysis.
Who is it for?
Improving players
Turn a vague sense that you “need to get better” into a ranked list of the exact leaks costing you the most rating.
Competitive players
Find the soft spots in your own repertoire before an opponent does, and shore them up ahead of a rated event.
Coaches
Get an objective read on a student’s recurring weaknesses across their history, so lessons target what the data shows - not just the last game they remember.
Chess enthusiasts
See your own tendencies laid out clearly, for free, with no account and nothing uploaded.
What is Audit Chess?
Audit Chess is a chess analysis platform that reads your Chess.com or Lichess game history and identifies the recurring weaknesses, opening tendencies, blunders, blown wins, missed mates and endgame patterns that are hard to see from a single game. It runs Stockfish in your browser, needs no account, and never uploads your games.
What makes it different: most chess engines analyze one position or one game. Audit Chess focuses on the patterns across your whole history - and turns them into training, so your own blunders become Stockfish-verified puzzles and your weakest openings become concrete things to study.
Frequently asked questions
How do I find my weaknesses in chess?+
Look at your own games in bulk, not one at a time. Enter your Lichess or Chess.com username and Audit Chess analyzes your whole history with Stockfish to rank your weaknesses by how many points they actually cost you: your worst-scoring openings, the mistakes you repeat, the winning positions you lose, the mates you miss, and the endgame types you handle badly.
Why can't I just feel where I'm weak?+
Because intuition is biased toward memorable losses, not frequent ones. The line that costs you two rating points a game across fifty games hurts far more than the one dramatic blunder you still remember, but it never feels urgent. Ranking weaknesses by real results across your history corrects for that.
What does it actually check?+
Six dimensions: openings ranked by win/draw/loss, recurring tactical and positional mistakes, blown winning positions, missed forced mates, endgame tendencies, and a playstyle profile. Each is drawn from your games, so the output is specific to you rather than generic advice.
What do I do once I know my weaknesses?+
Drill them. Audit Chess turns your recurring blunders into puzzles built from the exact positions you got wrong, and points you at the openings worth fixing first - so the weakness you found becomes the thing you practise next.
Audit Chess is free and not affiliated with Chess.com or Lichess.