Chess by Max Health

Chess by Max Health lets people play and study chess inside ChatGPT. Players can start a single-player game against the built-in Stockfish engine at a chosen difficulty (Beginner to Maximum) or against the conversation model, with selectable color and time controls, and can join a live multiplayer lobby to play other people (with optional ranked ELO and match history for signed-in Max Health users). The same Stockfish engine analyzes games: per-move accuracy, blunders and inaccuracies, the turning points, and the time spent on each move, shown on an interactive board the user can step through. Games to analyze can come from the current session, a signed-in user's stored matches, or any public chess.com or Lichess username fetched live. Single positions can also be evaluated for the best move and main line, and key positions can be illustrated on a board with the recommended move and an evaluation bar.