ChessMogg
How the free game review works
- Enter your username. Chess.com or Lichess. Your latest games load from their public APIs; no password, no PGN export.
- Pick a game. Losses teach the most.
- Stockfish 19 analyzes every position right in your browser, several positions at once, and grades each move by how much of your winning chances it kept or gave away.
- Chad walks you through the key moments: what you played, what the engine wanted, and what your opponent could have done.
What the move grades mean
| Grade | Meaning |
|---|---|
| Brilliant !! | The only strong move, and it sacrifices material. |
| Great ! | The only move that keeps your position; the alternatives were much worse. |
| Best · Excellent · Good | The engine’s top choice, or within a few percent of it. |
| Book | A known opening move. |
| Inaccuracy ?! | Gave away some winning chances (5–10%). |
| Mistake ? | Gave away a lot (10–20%). |
| Blunder ?? | Gave away 20% or more, often a piece or the game. |
Accuracy uses the same win-percentage model popularized by Lichess, so a 90% game means you kept almost all of your chances on almost every move.
From one game to every game
A single review shows a single mistake. Your rating is held back by the mistakes you repeat. The full ChessMogg AI chess coach looks across hundreds of your games, finds those patterns, and turns each one into a lesson with Chad. Compare options in our guide to chess game review tools.
Start on the web · Get the iPhone app
Frequently asked questions
Is this chess game review really free?
Yes. The game review is free and unlimited, with no sign-up. Analysis runs on your own device with Stockfish 19.
Does it work with Chess.com games?
Yes. Enter your Chess.com username to see your recent games and review any of them. No Chess.com membership needed.
Does it work with Lichess games?
Yes. Switch to Lichess and enter your Lichess username.
How long does a review take?
A few seconds on most laptops; somewhat longer on phones. Moves are graded as the analysis runs, so you can start stepping through right away.
How is this different from Chess.com Game Review?
It is free and unlimited for Chess.com and Lichess games. And ChessMogg’s full coach goes further by finding the mistakes you repeat across all your games.