Your games. Your mistakes. Your puzzles.
Stop making the same mistakes.
Puzzle sites train you on strangers’ games. DejaChess turns your own blunders into puzzles — the exact positions where you went wrong — and drills them until the right move is reflex.
No account needed — analysis runs right in your browser. How it works
Completely free. No credit card, no trial, no premium tier. Your first puzzles are ready in minutes.
From your game on Aug 30
White to moveFind the move you should have played.
Four moves to fewer blunders
Type your username
Chess.com or Lichess. That’s the whole setup — no passwords, nothing to install.
Stockfish finds your mistakes
It replays your games right on your device and flags every hung piece, missed tactic, and losing trade.
Drill them as puzzles
Each mistake becomes a puzzle: the exact position from your game, one move before it went wrong.
Watch them disappear
Spaced repetition brings each position back until the right move is reflex.
Your games, not strangers’
Every puzzle site drills you on other people’s positions. DejaChess builds your training from the moves you actually played — the openings you actually reach, against the traps you actually fall for.
Every mistake, found and explained
Stockfish checks each move you played and explains what went wrong in plain language: “this hangs your bishop”, “you missed a fork”. Analysis happens on your device — your games stay yours.
Déjà vu, on purpose
You’ll meet each position again — one move before the blunder. Play the right move this time. It comes back next week, then next month, until you can’t get it wrong.
Proof you’re improving
Your dashboard shows your most common mistake types, your win rates by opening, and the only chart that matters: blunders per game, going down.
Completely free.
No trial to outrun. No premium tier hiding the good stuff. Every feature, for every player, at every rating.
Private, too: Stockfish runs on your device, so analysis happens right there. Your games stay yours.
Your last 25 games are full of lessons.
Enter your username and your first puzzles are ready in minutes — free.
Turn my games into puzzlesComing soon
On the App Store and Google Play
Native apps for iPhone and Android are on the way. Drill your mistakes from anywhere.