How to use
Tap a piece, then tap where it should go. After every move, one of the strongest chess engines compares it with the best move in that position, measures your loss in centipawns (one pawn = 100) and grades it on a five-step scale. For weaker moves it shows how the AI would punish it.
How grading works
- Bestloss up to 10
- Goodup to 40
- Inaccuracyup to 90
- Mistakeup to 250
- Blundermore than 250
Aim for zero blunders first. Not leaving pieces hanging is the fastest way to improve.
Notation
- K king, Q queen, R rook, B bishop, N knight, no letter for pawns.
- e4 pawn to e4 · Nf3 knight to f3 · x capture · + check · # mate · =Q promote · O-O castle.
- Files a–h, ranks 1–8; a1 is White's bottom-left corner.
The engine runs inside your browser and games are stored only in this browser (software used).