Play, review and improve · Fairy-Stockfish connected automatically
Game mode
Engine play requires an HTTPS website with cross-origin isolation. Deploy the ready-to-upload ZIP on Cloudflare Pages. Downloaded HTML files cannot run this multithreaded engine.
No output yet.
Thinking time controls calculation time, not a calibrated Elo difficulty. The engine runs on your device after downloading from this website.
Current game
Game record
Tap a move to review that position. Return to Live to continue playing.
Quick guide
Changing game mode or your color starts a new match. Export this match first if you want to keep a record.
This replaces the current match with a validated local game record for review. The engine will not make moves in imported records. Export your current match first if needed.
This will replace the current match. You can save the existing match first using Save game.
Jianwu on a 7×8 board. White plays first. Play locally or against Fairy-Stockfish.
Alpha note: extensive engine move-generation comparisons pass, but rare repetition cases and full browser compatibility still require further testing. No clocks or rated games yet.