About Chess

Play chess against Stockfish, one of the strongest chess engines in the world, right in your browser. This is the free, open-source BoldChess Web App with Stockfish 19 running on your own device, so there is no account, no waiting for an opponent and no internet connection needed once the page has loaded.

The computer starts at a friendly strength of about 1320 Elo and can be raised step by step up to about 3190. Besides playing against the computer, you can play a friend on the same device, switch on coach mode to see the engine's best move and evaluation while you play, and review the finished game: every move is graded from best move to blunder, the opening is named and an evaluation graph shows how the game went.

How to play

You play White; move a piece by dragging it or by clicking it and then its target square.

The computer answers with Black.

Open the menu (three lines) to change the computer's strength, play Black, play a friend or reset the game.

After the game, open the Game Report to see which moves were good and which were mistakes.

Controls

Mouse / touch: drag a piece, or click a piece and then a square

Arrow buttons: step back and forward through the moves

Menu: game mode, computer strength (Elo), coach mode, board theme, flip board

Tips

New to chess? Keep the computer at its lowest strength and turn on coach mode for hints.

Raise the strength by small steps as you win more games.

The icons above the panels open extra windows: legal moves with evaluations, move history, evaluation graph, openings and the game report.

Games are not saved when you leave the page.

Devices

Plays on computers, phones and tablets in any modern browser.

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