Find a move in one position
- Next chess move calculator, set a position and get the move to play.
- Best chess move finder, the same search shown as three ranked candidates.
- Chess move calculator, evaluation first, for reading who stands better and by how much.
- Chess solver, the same search framed as a puzzle answer, including forced mates.
- Online chess engine, raw Stockfish 17 with nothing installed and nothing uploaded.
- Free chess analysis board, play the position forward and back with the engine following you.
- Chess board editor, build a position piece by piece and copy the FEN.
All of these run one Stockfish search on the position you give them, except the board editor, which sets a position up without analyzing it. They differ in how the answer is presented, so use whichever framing matches the question you are asking.
Review a whole game
- Free chess game review, paste a PGN and get accuracy, move classifications and the moves that cost the game.
- Chess accuracy calculator, the same review with the method behind the accuracy figure explained in full.
Both search every position in the game in sequence, so they take a few minutes for a long game. Nothing is uploaded and no account is required.
Work out a rating
- Chess Elo calculator, the rating change for one game, shown for a win, a draw and a loss at once.
- Chess rating calculator, a whole event, including the FIDE performance rating.
These two are arithmetic only. They load no engine and no board, so they open instantly even on a slow connection.
Why these are free
The position tools here (the move finder, the solver, the engine and the board editor) run Stockfish inside your browser, so there is no per analysis cost to recover and no reason for an account wall. The game review is the exception: it runs on Chess DNA's servers at depth 18, the same pipeline the app uses, and the full engine review is still free without an account. Only the coach's AI explanations are metered, three per visitor, with more after a free sign-up.
What the tools cannot do is see across your games. That is what Chess DNA is for: it imports your games from Chess.com or Lichess, analyzes them at depth 18, and sorts the errors into nine weakness themes so the repeated mistake becomes visible.
Frequently Asked Questions
Are these chess tools really free?
Yes. No account, no email and no payment for any of the engine tools, including the full game review. The one metered part is the AI coach explanation in the game review: three are free, and a free Chess DNA account gives you more.
Do the tools work offline?
After the first use, largely yes. The engine is cached by your browser once downloaded, and the pages themselves are static. The first search on a device needs a connection to fetch roughly 7 MB of engine.
Is my game data uploaded anywhere?
No. The PGN or FEN you paste stays in the page. Analysis runs in a Web Worker on your own device.
Which engine do these tools use?
Stockfish 17.1, in its lite WebAssembly build. It is the same open source engine used by Lichess and by the Chess DNA app.