Chessigma
REMOTE · WWW.CHESSIGMA.COM
Chess opening guides and names, FEN and PGN checks, the daily chess puzzle and Elo estimates.
Available components
Last scanned (3 hours ago)
Scores higher than 93% of remote servers
Reachable. Last reached 5 Nov 2026.
Category Entertainment and Games
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. How we score → Why this is hard to score →
Endpoint Security80
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability75
- AI-judged instruction clarity (excellent).Pass
- 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. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage87
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 55% of tool parameters carry a description.Partial
- Structured output schemas are declared (100% of tools); any adoption earns full credit.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 7 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 1 Nov 26 0
- Stability: 0.97 → pass security
- 31 Oct 26 +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.
- 28 Oct 26 +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.
- 26 Oct 26 +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.
- 24 Oct 26 +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.
- 22 Oct 26 +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.
- 20 Oct 26 +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.
- 18 Oct 26 +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.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 5 Nov 2026 · Probed https://www.chessigma.com/api/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=*.chessigma.com | CN=YR2,O=Let's Encrypt,C=US | 3 Oct 2026 | 1 Jan 2027 | RSA 2048 | SHA256-RSA | 54a2060e3a557c206bf6f2cadc461fcf3ef |
| SANs: *.chessigma.com, chessigma.com | ||||||
| CN=YR2,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | 4ebd24947e24d394802d84a52fd5b319 |
| CN=Root YR,O=ISRG,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | RSA 4096 | SHA256-RSA | f24b6d17f9d9ad7cb1c9fea78782699f |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of www.chessigma.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| chessigma.com. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=63072000 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://www.chessigma.com/api/mcp | Verified | 200 | |
| http (plaintext) | http://www.chessigma.com/api/mcp | HTTPS enforced | 308 | https://www.chessigma.com/api/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
analyze_game Analyze Game ~175
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.
| Name | Type | Req | Description |
|---|---|---|---|
| pgn | string | yes | The game as PGN, or SAN movetext such as "1. e4 e5 2. Nf3". |
| Name | Type | Req | Description |
|---|---|---|---|
| analysisUrl | string|null | yes | – |
| black | string|null | yes | – |
| ending | string | yes | – |
| finalFen | string | yes | – |
| note | string | yes | – |
| opening | – | yes | – |
| plies | integer | yes | – |
| result | string | yes | – |
| reviewUrl | string|null | yes | – |
| white | string|null | yes | – |
No examples provided.
analyze_position Analyze Position ~155
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.
| Name | Type | Req | Description |
|---|---|---|---|
| fen | string | yes | The position in FEN. The two move counters may be omitted. |
| Name | Type | Req | Description |
|---|---|---|---|
| analysisUrl | string | yes | – |
| bestMoveUrl | string | yes | – |
| fen | string | yes | – |
| legalMoves | array | yes | – |
| material | object | yes | – |
| opening | – | yes | – |
| sideToMove | string | yes | – |
| status | string | yes | – |
No examples provided.
calculate_elo Calculate Elo ~115
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.
| Name | Type | Req | Description |
|---|---|---|---|
| kFactor | integer | – | – |
| opponentRating | integer | yes | – |
| result | string | yes | – |
| system | string | – | – |
| yourRating | integer | yes | – |
| Name | Type | Req | Description |
|---|---|---|---|
| calculatorUrl | string | yes | – |
| change | number | yes | – |
| expectedScore | number | yes | – |
| kFactor | number | yes | – |
| newRating | number | yes | – |
| opponentRating | number | yes | – |
| result | string | yes | – |
| system | string | yes | – |
| yourRating | number | yes | – |
No examples provided.
get_daily_puzzle Get Daily Puzzle ~154
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.
| Name | Type | Req | Description |
|---|---|---|---|
| date | string | – | A day from 2024-01-01 to today (UTC). Omit for today. |
| Name | Type | Req | Description |
|---|---|---|---|
| date | string | yes | – |
| fen | string | yes | – |
| opponentLastMove | string | yes | – |
| playUrl | string | yes | – |
| puzzleId | string | yes | – |
| rating | number | yes | – |
| sideToMove | string | yes | – |
| solution | array | yes | – |
| themes | array | yes | – |
No examples provided.
get_opening_guide Opening Guide ~167
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.
| Name | Type | Req | Description |
|---|---|---|---|
| opening | string | yes | Opening name or slug, e.g. "London System", "caro-kann", "Sicilian Najdorf". |
| Name | Type | Req | Description |
|---|---|---|---|
| analysisUrl | string|null | yes | – |
| eco | string|null | yes | – |
| found | boolean | yes | – |
| ideas | – | yes | – |
| mainLine | string|null | yes | – |
| name | string|null | yes | – |
| strengths | array | yes | – |
| suggestions | array | yes | – |
| summary | string|null | yes | – |
| trainerUrl | string|null | yes | – |
| variations | array | yes | – |
| weaknesses | array | yes | – |
No examples provided.
identify_opening Identify Opening ~133
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.
| Name | Type | Req | Description |
|---|---|---|---|
| moves | string | yes | SAN movetext or a PGN; tags are optional. |
| Name | Type | Req | Description |
|---|---|---|---|
| analysisUrl | string|null | yes | – |
| bookPlies | integer | yes | – |
| eco | string|null | yes | – |
| found | boolean | yes | – |
| leftBookAt | string|null | yes | – |
| name | string|null | yes | – |
| trainerUrl | string|null | yes | – |
No examples provided.
review_online_game Review Online Game ~120
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.
| Name | Type | Req | Description |
|---|---|---|---|
| url | string | yes | A Chess.com live game link or a Lichess game link. |
| Name | Type | Req | Description |
|---|---|---|---|
| note | string | yes | – |
| platform | string | yes | – |
| reviewUrl | string | yes | – |
No examples provided.
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.
remote · www.chessigma.com
claude mcp add --transport http com-chessigma-chessigma 'https://www.chessigma.com/api/mcp'
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.