Chessda
B
Black
0.0
W
Whiteto move

Play moves to build your line.

Free Online Chess Analysis Board

The Chessda analysis board is a free, unlimited chess engine you run in your browser. Play moves from the starting position or set up any position you like, and Stockfish 18 shows the best move and a live evaluation — no account, no limits, and nothing leaves your device.

How to analyze a position

  1. Open the analysis board. Open the analysis board — it loads the starting position with Stockfish ready in your browser.
  2. Play or set up a position. Make moves on the board to explore a line, or switch to Edit Board to drag pieces into any legal position and press Start Analysis.
  3. Read the engine's evaluation. The eval bar and graph show who is better and by how much, and the best-move arrow shows Stockfish's top suggestion — refining live as the search deepens.

Frequently asked questions

Is the chess analysis board free?

Yes. It's completely free and unlimited, with no account and no ads. Stockfish runs in your browser, so there's nothing to meter.

Which engine powers the analysis?

Stockfish 18, compiled to WebAssembly and run in your browser — multi-threaded across your CPU cores when the browser allows it, with a single-threaded fallback.

Can I analyze a custom position?

Yes. Use the Edit Board tab to place pieces and set whose move it is, then press Start Analysis to evaluate that exact position.

Does my analysis leave my device?

No. Everything runs locally in your browser — no positions or moves are uploaded to any server.

Want a full game breakdown instead? Review a complete game to get move classifications, per-player accuracy, an eval graph, and a guided walkthrough.