How well you really play
Your rating measures results. This measures your moves: it compares you with players of your rating analysed the same way and tells you what rating you play at, what lifts you and what holds you down.
Learn from your own games
Why do you lose games?
- Do you play what your rating says?
- Do some branches of your openings leave you worse before move 12?
- Do you drift out of your own repertoire because you forgot it?
- Do you let go of games you were winning?
Stockfish reads your games, compares you with players of your rating analysed the same way, and turns your mistakes into training made for you.
- How well you really play
- Exercises from your games
- Your weakest variations
- A report every week
Free. Create an account, connect Lichess or chess.com, and your games come in on their own.
Also in Español
Three answers from your own games
Not advice for anybody's chess. What happened in yours, game by game and move by move.
Why you lose points
Stockfish reads every lost game and finds the move that cost it. Then it says what kind of mistake it was: an opening that left you worse, a blunder with time on the clock, a winning position let go, or the clock itself.
Where your openings go wrong
Your own opening tree, position by position. Which branch of your French costs you points: what you play there, how often, and how it goes.
Then train exactly that
Two made of your own games (the opening variations you are weakest in, and the very moments your games went wrong) and three games to sharpen the rest: a whole game against a partner of your level, board memory, and blindfold. One belt counts all of them.
Custom tools
Built from your own games: the openings you play and the positions where they went wrong.
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Opening lines
The openings where your own games drop most points, practiced against the moves real players make, with a verdict on every move of yours.
Open → -
Your positions
The positions of your own analysed games where it went wrong: find the move you missed, keep the advantage you threw away, and play the opening moment again — each one back until you get it twice.
Open → -
Your repertoires
The positions of your own repertoire you forget: every move you play where it has an answer is checked, and the ones you missed come back until you play them right three times running.
Open →
Games
Whole games at your level, board memory and blindfold: the same for everybody, and good for sharpening your eye.
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How it compares
Most chess training is somebody else's chess
Puzzles come from other people's games, courses teach the author's repertoire, and a game review stops at the end of the game. Sparring Chess trains you on your real mistakes, in the games you just played and the openings you actually play.
| Sparring ChessBuilt from your games | Puzzle setsTactics trainers | Opening coursesBooks, videos, drills | Engine reviewOne game at a time | A coachLessons by the hour | |
|---|---|---|---|---|---|
| Trains your own mistakesExercises from the positions you got wrong | ✓Every position you got wrong | –Positions from other people's games | –Positions the author chose | ~Shows them, you do not train them | ✓If they go through your games |
| From the games you just playedThis week's games, not last year's | ✓Analysed as they come in, a report every Friday | –Unrelated to your games | –Unrelated to your games | ✓The game you just finished | ~At the next lesson |
| The openings you actually playBranch by branch, from your games | ✓The variation that costs you points | –No openings | ~The author's repertoire, not yours | ~Names the opening of one game | ✓If you bring your games |
| Why you lose, across all your gamesThe pattern, not one game | ✓Conversion, opening, blunders, the clock | – | – | –One game at a time | ~What they remember of you |
| Compares you with players of your ratingAnalysed the same way as you | ✓Against 16,000 games of every level | –A puzzle rating | – | ~A score per game, without your peers | ~From experience |
| Comes back until you get itRepetition that ends when it is learnt | ✓Until you find it twice running | ~Rated, rarely repeated | ✓Spaced repetition | –Read once | ~Homework |
| Cost to start | ✓Free | ✓Free or cheap | ~Paid per course | ~Free with limits | –Paid per hour |
✓Yes ~Partly –No