Game analysis is the tool that runs a chess engine through a game you played and grades every move. It kicks in at the end of a game, or when you hit “Analyse” from your game history.
The engine is Stockfish 17 and it runs on your device — your game isn't uploaded anywhere, you don't wait in a queue, and you don't pay for analysis.
What does the Game Report show?
When analysis finishes, a Game Report card appears. At the top sit both players' accuracy percentages: a summary of how close your moves were to the engine's choices.
Below that comes the quality breakdown. Every move lands on a label: Brilliant, Excellent, Best, Book, Good, Inaccuracy, Mistake and Blunder. Those badges also appear on the board, on the square where the move was played — so you see what happened without reading a single line of notation.
The report also splits the game into three parts: opening, middlegame and endgame. One glance is usually enough to see where your weak phase is.
Evaluation graph and critical moments
The graph shows how the advantage changed hands through the game. Sudden drops are usually where something went wrong.
You don't have to hunt for them: the “Critical moment” arrows jump you straight to the moves that decided the game. At each one you can see what the engine would have played (“Best was: …”).
Moves are written in figurine notation — ♘f3 instead of Nf3 — so they read the same in any language.
“Better moves”: run the alternatives
When you get stuck on “so what should I have played?”, run the Better moves panel. The engine studies that position in depth and lists the top three moves with their evaluations.
You can play each option's continuation out on the board. It also tells you which of the engine's choices your move actually was, and how many pawns it cost you.
The most valuable output: your own puzzles
Analysis doesn't just leave a report behind. The critical moments in your game become personal puzzles: the same position comes back, and this time you have to find the right move.
It's the shortest route to not repeating a mistake. We explained how it works in our personal puzzles post.
To analyse a game, head to your games — or play a new one first: find an opponent.
See you in the next story.
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