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Chessigma

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Chess opening guides and names, FEN and PGN checks, the daily chess puzzle and Elo estimates.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http chessigma 'https://www.chessigma.com/api/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "chessigma": {
            "type": "http",
            "url": "https://www.chessigma.com/api/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. Chessigma MCP server
  2. Connect
  3. Tools
  4. Try asking
  5. Privacy and limits
  6. Support
  7. License

Chessigma 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.

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

ToolWhat it does
get_opening_guideChessigma'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_openingNames the opening of a move sequence or PGN: ECO code, how long it followed theory, and the first move that left it.
analyze_positionReads a FEN: side to move, check, mate or stalemate, every legal move, the material count and the opening name.
analyze_gameSummarizes a PGN: players, result, opening, how the game ended and the final position.
review_online_gameTurns a public Chess.com live game or Lichess game link into a link to its move-by-move review on Chessigma.
get_daily_puzzleToday's puzzle, or any day's since 1 January 2024: the position, the solution and a link to play it.
calculate_eloEstimates 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

mehdi@chessigma.com

License

The contents of this repository are under the MIT License. The Chessigma name and logo are not.

Frequently asked questions

What is Chessigma?

Chess opening guides and names, FEN and PGN checks, the daily chess puzzle and Elo estimates.

How do I install Chessigma?

It runs as a remote server. In Claude Code: claude mcp add --transport http chessigma 'https://www.chessigma.com/api/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Chessigma need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is Chessigma open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains Chessigma?

It is published by mehdi-bh. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.