Game review
A chess game review that tells you why the move was bad
Paste a PGN or pull your games straight from chess.com. chessKish scores the game, marks every blunder, mistake and inaccuracy, and then explains the turning points in ordinary words instead of an evaluation number you have to interpret yourself.
Four steps from finished game to a lesson
-
Bring in the game
Paste the PGN, or type your chess.com username and pick from your recent games.
-
Let the engine score it
A WebAssembly chess engine evaluates every position in the game, locally in your browser.
-
Read the report card
You get an accuracy figure plus a tally of how many moves were blunders, mistakes and inaccuracies, for both players.
-
Walk through the turning points
Step move by move on the board. The weak points are highlighted and the coach explains what went wrong and what the alternative was.
What you get back
An accuracy score
A single number for the game, so you can compare this week's play with last week's instead of guessing.
Every move classified
Blunders, mistakes and inaccuracies are counted and marked on the move list, so you can see exactly where the game turned.
The better move
When a move is criticised you also see what the engine preferred, and by how much the evaluation changed.
Explanations, not just numbers
The explanation engine turns the engine's verdict into a sentence about the position, which is the part that actually teaches you something.
Your games stay on your machine
Most game review tools queue your game on a server and hand back a result. chessKish ships the engine to you as WebAssembly and runs it in the browser tab, so the review works offline once the page has loaded, there is no queue, and your games are never uploaded anywhere.
The one deliberate exception is the optional chess.com import. That makes a request directly to the public chess.com API, which permits browser requests, to fetch the games you asked for.
Reviewing a game from somewhere else? Paste the PGN. Everything works the same and no request leaves your browser at all.
Questions
Is the chess game review free?
Yes. Opening a game, reviewing it move by move and reading the explanations costs nothing and needs no account. The review engine runs inside your browser rather than on a paid server.
Do I have to upload my games?
No. The analysis engine is delivered as WebAssembly and runs on your own machine, so the moves never leave the browser. Only the optional chess.com import makes an outbound request, and that request goes straight to the public chess.com API.
Can I review a game I played on chess.com?
Yes. Enter your chess.com username and chessKish fetches your recent games from the public chess.com API, which allows browser requests. You can also paste a PGN directly if your game came from somewhere else.
What counts as a blunder, a mistake and an inaccuracy?
Each move is compared against the engine's preferred continuation and the evaluation swing decides the label. A small drop is an inaccuracy, a larger one a mistake, and a move that throws away a clearly winning or drawn position is a blunder.