What you get
- Your #1 leak, named in plain English — the recurring mistake, by game phase and move type, that costs you the most.
- How often it happens — how many times it showed up across the games we checked.
- A puzzle from your own game — the exact position where you went wrong, so you can play the move you missed.
- An approximate rating cost — roughly how many rating points this one habit is worth.
How it works
1. Paste your username. Pick Chess.com or Lichess and enter your public username — nothing else.
2. Stockfish reads your games. Chessy pulls your recent games and evaluates every move with the Stockfish engine at real analysis depth.
3. See your leak and solve it. Chessy groups your mistakes, surfaces the costliest recurring one, and hands you a puzzle from your own blunder.
Why it's accurate
Every move is scored by Stockfish, the strongest open-source engine — not guessed at or copied from generic advice. Your leak is computed from your own real games, so the result is specific to how you actually play, not a one-size-fits-all tip.
Frequently asked questions
Is the chess game analysis really free?
Yes — completely free with no signup and no card. Paste your username and Chessy analyzes your recent games with Stockfish and shows your biggest recurring mistake plus a puzzle built from one of your own games.
Do I need an account to analyze my games?
No. The leak check is anonymous — you only enter your public Chess.com or Lichess username. A free account is optional and unlocks move-by-move coaching and ongoing game reviews.
Which sites does it work with?
Chess.com and Lichess. Chessy reads your recent public games from either platform directly.
How many of my games does it check?
The free analysis looks at a sample of your most recent games, runs each through Stockfish, and finds the single habit — by game phase and move type — that costs you the most rating.
What kind of mistakes does it find?
Common recurring leaks: hanging pieces, missed tactics and forks, opening inaccuracies, converting winning endgames, and time-trouble blunders — whichever one is costing you most.
Ready to see the one mistake holding your rating back?