Type your moves, read the bot's reasoning, and learn as you play. It keeps the move list, checks your moves are legal, explains its plans in one sentence, and switches to coach, puzzle or opening-lesson mode whenever you ask. Free, no sign-up.
Every move comes with a one-line reason, so you see the ideas, not just the notation. Casual mode adds natural mistakes it owns up to afterwards; honest mode makes it try its best.
Paste a FEN, a move list or just describe the board, and get the threats, weaknesses and a plan as short bullet points.
Forks, pins, back-rank mates and discovered attacks one puzzle at a time with hints, plus the first moves of any opening and why they work.
How strong is it?
It plays sensible club-level chess and explains itself. It is a talking partner and coach, not an engine for serious analysis.
How do I enter moves?
Standard algebraic notation like e4, Nf3, O-O, exd5 — or describe the move in words.
Will it tell me if my move is illegal?
Yes, and ask you to try again. If it loses track of the board it says so rather than guessing.
Is it free?
Yes, free and no sign-up needed.