# Chessigma (remote · www.chessigma.com)

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

- Trust score: 86/100 (high trust)
- Change this week: +1
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `www.chessigma.com`: 86/100 (this document), [markdown](https://verifymcp.io/servers/com-chessigma-chessigma/api-mcp.md), [page](https://verifymcp.io/servers/com-chessigma-chessigma/api-mcp)

## Channel facts

- Endpoint: `https://www.chessigma.com/api/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `2.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 75/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 1019 tokens (~145/item across 7 items; 7 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 100/100
  - No destabilizing schema changes in the last 30 days.
- **Tool Coverage**: 87/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 55% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 7 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Chessigma MCP server?

Chessigma is a hosted endpoint at https://www.chessigma.com/api/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http com-chessigma-chessigma 'https://www.chessigma.com/api/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "com-chessigma-chessigma": {
      "url": "https://www.chessigma.com/api/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "com-chessigma-chessigma": {
      "type": "http",
      "url": "https://www.chessigma.com/api/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.com-chessigma-chessigma]
url = "https://www.chessigma.com/api/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-chessigma-chessigma": {
      "type": "remote",
      "url": "https://www.chessigma.com/api/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-chessigma-chessigma --url 'https://www.chessigma.com/api/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-chessigma-chessigma:
    url: "https://www.chessigma.com/api/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "com-chessigma-chessigma": {
      "Transport": "http",
      "Url": "https://www.chessigma.com/api/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-chessigma-chessigma -t streamable-http -u 'https://www.chessigma.com/api/mcp'
```

### Other

```json
{
  "mcpServers": {
    "com-chessigma-chessigma": {
      "type": "http",
      "url": "https://www.chessigma.com/api/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-01 (score 86, 0)

- [security] Stability: 0.97 → pass

### 2026-10-31 (score 86, +1)

No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-28 (score 85, +1)

No change was recorded against any check on this day. Stability & Change Management went from 83 to 87. That category is still filling its 30-day observation window: 25 days of observed history at the previous scan, 26 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-26 (score 84, +1)

No change was recorded against any check on this day. Stability & Change Management went from 77 to 80. That category is still filling its 30-day observation window: 23 days of observed history at the previous scan, 24 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-24 (score 83, +1)

No change was recorded against any check on this day. Stability & Change Management went from 70 to 73. That category is still filling its 30-day observation window: 21 days of observed history at the previous scan, 22 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-22 (score 82, +1)

No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-20 (score 81, +1)

No change was recorded against any check on this day. Stability & Change Management went from 57 to 60. That category is still filling its 30-day observation window: 17 days of observed history at the previous scan, 18 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-18 (score 80, +1)

No change was recorded against any check on this day. Stability & Change Management went from 50 to 53. That category is still filling its 30-day observation window: 15 days of observed history at the previous scan, 16 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (7)

### `get_opening_guide` (~167 tokens)

Opening Guide

Look 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 and moves. When nothing matches, found is false and suggestions lists close names. Links open the opening's trainer and the analysis board on chessigma.com.

Input parameters:

- `opening` (string, required): Opening name or slug, e.g. "London System", "caro-kann", "Sicilian Najdorf".

Output parameters:

- `analysisUrl` (string|null)
- `eco` (string|null)
- `found` (boolean)
- `ideas`
- `mainLine` (string|null)
- `name` (string|null)
- `strengths` (array)
- `suggestions` (array)
- `summary` (string|null)
- `trainerUrl` (string|null)
- `variations` (array)
- `weaknesses` (array)

### `identify_opening` (~133 tokens)

Identify Opening

Identify 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.

Input parameters:

- `moves` (string, required): SAN movetext or a PGN; tags are optional.

Output parameters:

- `analysisUrl` (string|null)
- `bookPlies` (integer)
- `eco` (string|null)
- `found` (boolean)
- `leftBookAt` (string|null)
- `name` (string|null)
- `trainerUrl` (string|null)

### `analyze_position` (~155 tokens)

Analyze Position

Read 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 Stockfish engine runs in the user's browser at the returned analysisUrl (full analysis board) and bestMoveUrl (best move finder) on chessigma.com.

Input parameters:

- `fen` (string, required): The position in FEN. The two move counters may be omitted.

Output parameters:

- `analysisUrl` (string)
- `bestMoveUrl` (string)
- `fen` (string)
- `legalMoves` (array)
- `material` (object)
- `opening`
- `sideToMove` (string)
- `status` (string)

### `analyze_game` (~175 tokens)

Analyze Game

Summarize 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's Link or Site tag is a Chess.com live game or a Lichess game, a link to that game's move-by-move review. It never evaluates moves itself and stores nothing.

Input parameters:

- `pgn` (string, required): The game as PGN, or SAN movetext such as "1. e4 e5 2. Nf3".

Output parameters:

- `analysisUrl` (string|null)
- `black` (string|null)
- `ending` (string)
- `finalFen` (string)
- `note` (string)
- `opening`
- `plies` (integer)
- `result` (string)
- `reviewUrl` (string|null)
- `white` (string|null)

### `review_online_game` (~120 tokens)

Review Online Game

Turn 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.

Input parameters:

- `url` (string, required): A Chess.com live game link or a Lichess game link.

Output parameters:

- `note` (string)
- `platform` (string)
- `reviewUrl` (string)

### `get_daily_puzzle` (~154 tokens)

Get Daily Puzzle

Get 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 out yet, the latest one is returned: check date. playUrl opens the puzzle on chessigma.com.

Input parameters:

- `date` (string): A day from 2024-01-01 to today (UTC). Omit for today.

Output parameters:

- `date` (string)
- `fen` (string)
- `opponentLastMove` (string)
- `playUrl` (string)
- `puzzleId` (string)
- `rating` (number)
- `sideToMove` (string)
- `solution` (array)
- `themes` (array)

### `calculate_elo` (~115 tokens)

Calculate Elo

Estimate 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.

Input parameters:

- `kFactor` (integer)
- `opponentRating` (integer, required)
- `result` (string, required)
- `system` (string)
- `yourRating` (integer, required)

Output parameters:

- `calculatorUrl` (string)
- `change` (number)
- `expectedScore` (number)
- `kFactor` (number)
- `newRating` (number)
- `opponentRating` (number)
- `result` (string)
- `system` (string)
- `yourRating` (number)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-chessigma-chessigma/api-mcp#diagnostics

## Score history

- 2026-11-05: 86
- 2026-11-04: 86
- 2026-11-03: 86
- 2026-11-02: 86
- 2026-11-01: 86
- 2026-10-31: 86
- 2026-10-30: 85
- 2026-10-29: 85
- 2026-10-28: 85
- 2026-10-27: 84
- 2026-10-26: 84
- 2026-10-25: 83
- 2026-10-24: 83
- 2026-10-23: 82
- 2026-10-22: 82
- 2026-10-21: 81
- 2026-10-20: 81
- 2026-10-19: 80
- 2026-10-18: 80
- 2026-10-17: 79
- 2026-10-16: 79
- 2026-10-15: 78
- 2026-10-14: 78
- 2026-10-13: 78
- 2026-10-12: 77
- 2026-10-10: 76
- 2026-10-07: 75
- 2026-10-04: 73
- 2026-10-03: 73
- 2026-10-02: 72

## Common questions

### What is the Chessigma MCP server?

Chessigma is an MCP server listed in the public MCP registry as com.chessigma/chessigma. Chess opening guides and names, FEN and PGN checks, the daily chess puzzle and Elo estimates. This page covers its hosted endpoint (https://www.chessigma.com/api/mcp).

### Is the Chessigma MCP server safe to use?

Chessigma scores 86 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Chessigma MCP server expose?

Chessigma exposes 7 tools: get_opening_guide, identify_opening, analyze_position, analyze_game, review_online_game, and 2 more. Their descriptions and schemas cost roughly 1,019 tokens of context every time the server is loaded.

### Does the Chessigma MCP server require authentication?

No. We connected to Chessigma without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Chessigma MCP server still maintained?

Chessigma is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://www.chessigma.com/api/mcp
- Repository: https://github.com/mehdi-bh/chessigma-mcp
- Website: https://www.chessigma.com/developers/mcp
- Changelog RSS feed: https://verifymcp.io/servers/com-chessigma-chessigma/api-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-chessigma-chessigma/api-mcp.json
- HTML version of this page: https://verifymcp.io/servers/com-chessigma-chessigma/api-mcp