Using the board

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AI and open-source components

Vs-AI levels and hints run Stockfish locally in the browser. Attribution, licence text, and source links are on the About page. Upstream authors are not responsible for how this site runs.

Fair use

Do not attack the site, scrape it in a way that harms other visitors, or present the AI as a titled player. You may close the tab at any time.

Disclaimer

Software can be wrong. Check, mate, and draw detections follow the engine on this page; if something looks off, start a new game and tell us what you saw.