How does Play vs AI work?

Pick White, Black, or random, choose a difficulty, and start. You move on the board; the computer replies. There is no clock and no rating change. Use Undo to try another line.

What are the six difficulty levels?

Beginner (~200) blunders often. Easy (~500) is casual. Medium (~1200) is club-ish. Hard (~1800) is strong club. Expert (~2400) is very accurate. Master (2800+) plays near full engine strength.

What engine does the AI use?

Stockfish, limited on purpose at the lower levels with a shallower search and some weaker moves. Expert and Master search deeper and reply almost immediately.

Do I need to sign up to play the computer?

No. The game runs in the browser. Sign in only if you also want saved puzzle streaks, XP, or a play-vs-friend rating.

Can I take back a move?

Yes. Undo takes back your last move and the computer’s reply so you can try a different idea in the same position.

How should I use this for practice?

Play out an opening you just read about, finish a middlegame you analyzed on the homepage, or practice being a pawn down. Use the analyzer when you want the engine’s preferred move.