Chessigma MCP: openings, puzzles and Elo in your AI app

Add Chessigma to Claude, ChatGPT or Cursor

1. 1Click Connect Chessigma free. There's no sign-in, so its tools are ready at once.
2. 2Chessigma's tools only read, and all of them are on after you connect. Switch off any you won't use, such as `get_daily_puzzle` if you only check games.
3. 3Add ContextGate to your AI app as a connector or MCP server. The steps for each app are on the Works with page.
4. 4Paste a PGN into your AI app and ask Chessigma to check it and name the opening, then open Activity to see the calls.

Chess questions Chessigma can answer

• Name the opening of a game with `identify_opening`, then read Chessigma's guide to it with `get_opening_guide`.
• Read a FEN position's legal moves, material and status, such as check or stalemate, with `analyze_position`.
• Summarize a PGN game: players, result, opening and how it ended.
• Get the daily chess puzzle, or estimate a new Elo rating after one game.

Read-only, and on record

• Chessigma's tools don't change anything, but you can still switch off any of them; it's then hidden and refused if called.
• Activity shows every Chessigma lookup your AI app made.

What you get with Chessigma and ContextGate

• Your AI apps can use ChessigmaClaude, Cursor, ChatGPT and other AI apps reach Chessigma through the one ContextGate connection you add to them.
• You choose which tools they can useSwitch off any Chessigma tool you don't want used. It's hidden from your AI apps and refused if called.
• Every call is checked and recordedYour policies check each call (for example, personal data is hidden and secrets are blocked), and Activity keeps a record of it.

ContextGate sees only the tool calls that go through it, not your AI app's built-in tools or your chats.

Chessigma tools

Examples of what your AI apps can do in Chessigma. You'll see the exact list of tools after you connect it.

• get_opening_guideLook up a chess opening by name or slug (for example "London System", "Caro-Kann" or "sicilian-defense") and return Chessigma's guide to it: the main line in SAN, a short summary, up to four key variations with the idea behind each, the strategy for each side, strengths and weaknesses. Full guides exist for 18 popular openings; any of about 3,700 catalogued opening names returns its name, ECO code
• identify_openingIdentify the chess opening of a move sequence, given as SAN movetext ("1. e4 c5 2. Nf3 d6") or a full PGN. Returns the ECO code and name from a catalogue of about 3,700 named lines, how many half-moves (plies) followed known theory from move one, the first move that left it, a link to Chessigma's trainer when the opening has one, and a link that opens the moves on the chessigma.com analysis board.
• analyze_positionRead a chess position from a FEN and return facts computed by the rules alone: side to move, status (normal, check, checkmate, stalemate or insufficient material), every legal move in SAN, the material count (pawn 1, knight 3, bishop 3, rook 5, queen 9) and the opening name when the position is a catalogued opening. This tool does not evaluate the position and does not choose a best move: the Stoc
• analyze_gameSummarize a chess game given as a PGN or as plain SAN movetext: players, result, number of plies, the opening and how long it followed theory, how the game ended (checkmate, stalemate, draw by rule, or unfinished or resigned) and the final position. Returns a link that opens the whole game on the chessigma.com analysis board, where the Stockfish engine runs in the user's browser, and, when the PGN
• review_online_gameTurn the link of a public Chess.com live game or a Lichess game into a chessigma.com link that imports the game and opens a move-by-move review, computed by Stockfish in the user's browser. Nothing is fetched when this tool runs: the game is read from Chess.com or Lichess only when the user opens the link. Chess.com daily (correspondence) games are not supported; ask for the PGN instead.
• get_daily_puzzleGet Chessigma's daily chess puzzle: today's by default, or a past day's via date (YYYY-MM-DD, from 2024-01-01 to today in UTC). The position (fen) is given with the solver to move, after the opponent's last move. The solution is in SAN, with the solver's moves at even indexes and the opponent's replies at odd ones. Do not reveal the solution unless the user asks for it. If today's puzzle is not ou
• calculate_eloEstimate a player's new Elo rating after a single game with the Elo formula. Pure arithmetic, no chess engine. The system field picks a K-factor default for FIDE, Chess.com or Lichess, but the result is an Elo estimate: Chess.com and Lichess use Glicko ratings, so their real rating changes differ.