Start practicing chessChess · every move graded
The engine checks every move you play against the best move and tells you what it cost.
01
How it works
Pick your game
Choose from four AI strengths and play White or Black.
Get a grade on every move
Each move is measured against the best move in centipawns (one pawn = 100) and graded on a five-step scale. Weaker moves come with the line the AI would punish them with.
Hint, take back, compare
A hint shows the best move in the position. You can take a move back, or step back to the position before it and compare your move with the best one.
No sign-up. The engine runs inside your browser, and your games are stored only in this browser.
02
The grading scale
Bestloss up to 10
Goodloss up to 40
Inaccuracyloss up to 90
Mistakeloss up to 250
Blunderloss over 250
Loss is in centipawns. Aim for zero blunders first: not leaving pieces hanging is the fastest way to improve.
03
Where to go
| Page | What it is | Link |
|---|---|---|
| Chess dojo | Play the computer and get a grade on every move. | Play → |
| Chess strategy | The center, piece activity, king safety, pawn structure and basic endgames, with example boards. | Read → |
| Play a friend | Send a link and play online, then review every move of your game. | Play → |
| Practice | The positions where you made clear mistakes, asked again over the following days. | Practice → |