MCP Chess Server

This MCP let's you play chess against any LLM.

Installation

To use this chess server, add the following configuration to your MCP config:

{
  "mcpServers": {
    "chess": {
      "command": "uvx",
      "args": [
        "mcp-chess"
      ]
    }
  }
}

Usage

Play a game: !Chess starting position with black pieces

!A few moves later

Find a position in a PGN for game analysis:

!Find a position in a PGN

Available Tools

The server provides the following tools:

• get_board_visualization(): Provides the current state of the chessboard as an image. The board orientation automatically flips based on the user's assigned color.
• get_turn(): Indicates whose turn it is ('white' or 'black').
• get_valid_moves(): Lists all legal moves for the current player in UCI notation (e.g., 'e2e4', 'g1f3'). Returns an empty list if the game is over.
• make_move(move_san: str): Makes a move on the board using Standard Algebraic Notation (SAN) (e.g., 'e4', 'Nf3', 'Bxe5'). Returns the move in SAN and UCI, the new board FEN, and game status.
• new_game(user_plays_white: bool = True): Starts a new game, resetting the board. By default, the user plays white. Sets the user's color for board orientation. Returns a confirmation message.
• find_position_in_pgn(pgn_string: str, condition: str): Finds the first board position in a PGN string matching a condition (e.g., "bishop on a3") and returns an image of that board state. The condition format is "piece_type on square_name". Valid piece types are "pawn", "knight", "bishop", "rook", "queen", "king".

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