MCP Chess Server

1# MCP Chess Server
2 
3This MCP let's you play chess against any LLM.
4 
5## Installation
6 
7To use this chess server, add the following configuration to your MCP config:
8 
9```json
10{
11  "mcpServers": {
12    "chess": {
13      "command": "uvx",
14      "args": [
15        "mcp-chess"
16      ]
17    }
18  }
19}
20```
21 
22## Usage
23 
24Play a game:
25![Chess starting position with black pieces](screenshots/start_black.png)
26 
27![A few moves later](screenshots/acc_dragon.png)
28 
29Find a position in a PGN for game analysis:
30 
31![Find a position in a PGN](screenshots/find_position.png)
32 
33## Available Tools
34 
35The server provides the following tools:
36 
37*   `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.
38*   `get_turn()`: Indicates whose turn it is ('white' or 'black').
39*   `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.
40*   `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.
41*   `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.
42*   `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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