A chess analyzer runs an engine over positions and tells you who stands better and which move is strongest. On chess.rodeo that engine is Stockfish 18. It runs on the page itself, so you can analyze a game you played or set up a single position without installing anything.
What the analyzer shows
The main number is the evaluation in pawns: positive for White, negative for Black. A +1.4 means White is better by about a pawn and a half. Next to it are the engine lines: the best move and the candidates after it, each with its own evaluation.
When the analyzer goes through a whole game, you also get move labels, accuracy for both sides and an evaluation graph.
Where the engine runs
Stockfish 18 loads into the browser and searches on your device. Without an account the depth is 15; signed in, it goes up to 22. Many positions are already in our evaluation database, part of which comes from the open Lichess one, and they need no search. With Pro you can hand the work to the server.
A desktop engine can search deeper, but you have to install it and load the game into it. Here the game comes in by username and the engine starts on the page.
A whole game or one position
Paste a username, a link or a PGN and the analyzer goes through the whole game. For one position, open the board editor: set up the pieces or paste a FEN, pick the side to move and press Start analysis. From there you can play moves for either side and the engine evaluates each new position, which is handy for a position from a book or a stream.
Related
- Online Chess Board: the board editor and FEN in detail.
- Chess Game Analysis: a game, move by move.
- FEN Analyzer: a position from a FEN string.
- Free Chess Analysis: how many games you can analyze for free.