About Chessigma
Chessigma is a read-only MCP server for chess players and assistants, providing opening, position, game, puzzle, and Elo facts. It runs remotely without sign-in and does not use a chess engine.
Key features
- 01Opening guides and identification
- 02FEN position and PGN game checks
- 03Chess.com and Lichess review links
- 04Daily puzzles and historical puzzles
- 05Elo change estimates
Use cases
- 01Look up an opening from its name or moves
- 02Check legal moves and mate status from FEN
- 03Summarize a PGN or open a game review
- 04Get a puzzle or estimate a rating change
MCP support
Exposes read-only chess tools to MCP clients over Streamable HTTP at https://www.chessigma.com/api/mcp, without authentication. Its tools report chess-rule, opening-catalogue, and puzzle-archive facts; they do not run an engine.
Configuration
Remote servers need no local install. Pick your client, then copy the config or install in one click.
https://www.chessigma.com/api/mcpclaude mcp add --transport http com-chessigma-chessigma https://www.chessigma.com/api/mcp{"mcpServers":{"com-chessigma-chessigma":{"type":"http","url":"https://www.chessigma.com/api/mcp"}}}Open in Cursor{"servers":{"com-chessigma-chessigma":{"type":"http","url":"https://www.chessigma.com/api/mcp"}}}Open in VS Code{"mcpServers":{"com-chessigma-chessigma":{"type":"http","url":"https://www.chessigma.com/api/mcp"}}}{"mcpServers":{"com-chessigma-chessigma":{"serverUrl":"https://www.chessigma.com/api/mcp"}}}Run commands in a terminal; paste JSON into the client’s MCP config and restart. Servers that need sign-in will prompt on first connect.
Tools
7| Parameter | Type | Required | Description |
|---|---|---|---|
| opening | string | Yes | Opening name or slug, e.g. "London System", "caro-kann", "Sicilian Najdorf". |
Details
From the project READMEChessigma MCP server
Chess tools for Claude, ChatGPT and any MCP client, from Chessigma: opening guides, the opening behind any moves, position and game facts, review links for Chess.com and Lichess games, the daily puzzle and Elo estimates. Read-only, no account, no sign-in.
- Server URL:
https://www.chessigma.com/api/mcp(Streamable HTTP, no authentication) - Documentation: https://www.chessigma.com/developers/mcp
The server runs on chessigma.com, so there is nothing to install. This repository holds its public description and the server.json published to the official MCP Registry.
Connect
Claude (web, desktop and mobile apps): add Chessigma from Claude's connector directory, or search for Chessigma in Customize > Connectors. No account or sign-in.
Claude Code
claude mcp add --transport http chessigma https://www.chessigma.com/api/mcp
Cursor (~/.cursor/mcp.json)
{ "mcpServers": { "chessigma": { "url": "https://www.chessigma.com/api/mcp" } } }
VS Code (.vscode/mcp.json)
{ "servers": { "chessigma": { "type": "http", "url": "https://www.chessigma.com/api/mcp" } } }
ChatGPT and other clients: add a remote MCP server with the URL above, Streamable HTTP, no authentication.
Tools
| Tool | What it does |
|---|---|
get_opening_guide | Chessigma's guide to an opening by name: main line, key variations and the ideas for each side. Popular openings have a full guide; any of about 3,700 catalogued names returns its ECO code and moves. |
identify_opening | Names the opening of a move sequence or PGN: ECO code, how long it followed theory, and the first move that left it. |
analyze_position | Reads a FEN: side to move, check, mate or stalemate, every legal move, the material count and the opening name. |
analyze_game | Summarizes a PGN: players, result, opening, how the game ended and the final position. |
review_online_game | Turns a public Chess.com live game or Lichess game link into a link to its move-by-move review on Chessigma. |
get_daily_puzzle | Today's puzzle, or any day's since 1 January 2024: the position, the solution and a link to play it. |
calculate_elo | Estimates the rating change after one game with the Elo formula, with K-factor defaults for FIDE, Chess.com and Lichess. |
The tools state facts from the rules of chess, an opening catalogue and Chessigma's puzzle archive; they do not run an engine. For engine analysis, their links open the Chessigma analysis board, where Stockfish runs in your browser.
Try asking
- Teach me the Caro-Kann: main line, key variations and the ideas for both sides.
- What opening is 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6?
- Is Black checkmated here?
r1bqkb1r/pppp1Qpp/2n2n2/4p3/2B1P3/8/PPPP1PPP/RNB1K1NR b KQkq - 0 4 - Review this game for me: https://www.chess.com/game/live/173765478164
- Show me today's chess puzzle and let me try to solve it.
- I'm rated 1500 and just beat a 1650. How much Elo do I gain?
Privacy and limits
No tool writes data, calls an AI model or fetches another site while it runs, and the input you send is not stored. For rate limiting, each request's time, method, path, IP address and user agent are logged. All callers share 300 requests per minute. Details: privacy policy and terms.
Support
License
The contents of this repository are under the MIT License. The Chessigma name and logo are not.
Comments
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