BetterChess
Chess MCP for Claude: engine analysis, attack maps, game review. One URL, no install.
| Endpoint | https://mcp.betterchess.co (streamable-http) |
|---|---|
| Registry version | 1.0.0 |
| Now | 4 tools · grade A (100) · pin ts_e8c25ff63ad2fa3360d228e94992b5c0 · protocol 2025-06-18 |
| First / last listed | 2026-10-28 06:13 UTC / 2026-10-28 06:13 UTC |
| Grade over time | 2026-10-28: A (100), 4 tools |
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Tools: chess_analyse chess_attacks chess_rig chess_review
chess_analyse | Returns an engine evaluation of a chess position: the strongest candidate moves with their scores, and the position's checkable facts — side to move, whether that side is in check, undefended pieces and the pieces attacking them, and the material balance. Accepts a FEN, a PGN, or a list of SAN moves from the starting position. Also reports what the OPPONENT would play if it were their turn, which params: fen, pgn, moves, multipv, considering, traps |
chess_attacks | Returns the exact list of squares attacked by the piece standing on a given square in a chess position, together with that piece's type and colour. Returns an empty list when the square is unoccupied. Accepts a FEN, a PGN, or a list of SAN moves from the starting position. params: fen, pgn, moves, square* |
chess_rig | Returns the JavaScript source of the in-page coaching rig for a chess.com bot game, to be run in that page by the browser's javascript tool. Once running, the page exposes window.__coachWait(ms) (resolves with events and board status), window.__coachWatch.status() (moves, fen, turn, myTurn, result) and window.__coach (beginDraw, play, dashed, label, step, say) for drawing on the board. Also return params: none |
chess_review | Replays a finished game ply by ply with the engine and returns the moves where the evaluation swung by more than a threshold (default 1.5 pawns). Each entry gives the move number, the side that moved, the move played, the engine's preferred move, the size of the swing in pawns, the evaluation before and after, and the FEN of the resulting position. Accepts a PGN or a list of SAN moves, and can be params: pgn, moves, colour, threshold |
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