Every review published here feeds one dataset. This is what the corpus reveals about where real club players win and lose - patterns, not leaderboards.
Reviews, puzzles and drills you do on this device, for the last 13 weeks. It is stored only in this browser. A missed day or two never breaks a streak.
Tap a square to see that day.
Flagged errors per 10 moves, by phase. The rate - not the raw count - is what matters: middlegames simply have more moves.
Every flagged position is classified from the review itself. Average cost is the pawns of eval the error gave away, on the positions where we could measure it.
Both sides of every reviewed game, on our win%-based scale. The shape tells you what a normal club game looks like here - most sit in the sixties and seventies.
Rating estimated from the moves alone - no accounts involved. One entry per player per game.
The worst swings in the corpus. Each is a real position you can open and study.
| Opening | ECO | Games | Avg accuracy |
|---|
| Game | Opening | Result | Accuracy |
|---|