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BetterChess

co.betterchess/betterchess
Gaming Público y accesible MCP 2026-07-28

Qué hace este MCP

Analyzes chess positions, attacked squares, and completed games using engine evaluations and turning-point detection.

Capacidades

Herramientas

4 herramientas
chess_analyse
Analyse a chess position
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 is the difference between a position being quiet and merely looking quiet. Pass `considering` with a move you are thinking of playing and it returns what that move actually walks into — a losing move is usually not in the top candidates, so asking about it directly is the only way to find out.
Solo lectura
Esquema de entrada 
{'type': 'object', 'properties': {'fen': {'type': 'string', 'description': 'FEN of the position.'}, 'pgn': {'type': 'string', 'description': 'PGN; the position after the final move is used.'}, 'moves': {'type': 'array', 'items': {'type': 'string'}, 'description': 'SAN moves from the start, e.g. ["e4","e5"].'}, 'traps': {'type': 'boolean', 'description': 'Also scan the captures and checks available to the side to move and return the ones that lose, each with its refutation. Slower — several extra searches.'}, 'multipv': {'type': 'number', 'description': 'How many candidate moves (1-5, default 3).'}, 'considering': {'type': 'string', 'description': 'A move you are thinking of playing, in SAN, e.g. "Ng5". Returns the evaluation after it and the line that refutes it.'}}}
chess_attacks
What a piece 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.
Solo lectura
Esquema de entrada 
{'type': 'object', 'required': ['square'], 'properties': {'fen': {'type': 'string', 'description': 'FEN of the position.'}, 'pgn': {'type': 'string', 'description': 'PGN; the position after the final move is used.'}, 'moves': {'type': 'array', 'items': {'type': 'string'}, 'description': 'SAN moves from the start, e.g. ["e4","e5"].'}, 'square': {'type': 'string', 'description': 'The square, e.g. "d5".'}}}
chess_review
Review a game for turning points
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 filtered to one colour. Long games are truncated at 60 plies.
Solo lectura
Esquema de entrada 
{'type': 'object', 'properties': {'pgn': {'type': 'string', 'description': 'The finished game as PGN.'}, 'moves': {'type': 'array', 'items': {'type': 'string'}, 'description': 'Or SAN moves from the start.'}, 'colour': {'type': 'string', 'description': '"white" or "black" — whose mistakes to report. Default both.'}, 'threshold': {'type': 'number', 'description': 'Swing in pawns that counts as a turning point. Default 1.5.'}}}
chess_rig
The live-coach page 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 returns the rig version and the URL of the chess.com bot surface.
Solo lectura
Esquema de entrada 
{'type': 'object', 'properties': {}}
Historial

Cambios recientes en herramientas

Añadido
chess_review
17 de September de 2026 a las 07:58
Añadido
chess_rig
17 de September de 2026 a las 07:58
Añadido
chess_attacks
17 de September de 2026 a las 07:58
Añadido
chess_analyse
17 de September de 2026 a las 07:58
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