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Fischer960

A hand-curated chess variants reference — rules, setup, glossary, comparisons and history

Unify Dynamics LLC

Documentation
Tools8read-only
Sign-inNoneno account, no key
Data keptNoneprocessed in memory
PriceFreeoptional Pro limits
StatusLiveMCP + REST
Works withMCP · RESTany agent

Try asking

Real questions, and the tools your agent calls to answer them.

What's Chess960's castling rule?
Tools called
rule_lookup
starting_position_rule
How does Bughouse work?
Tools called
variant_info
What happens when you capture in Atomic chess?
Tools called
rule_lookup
How is Horde's board set up?
Tools called
starting_position_rule
What does 'drop' mean in chess variants?
Tools called
term_glossary
Compare Atomic and Crazyhouse
Tools called
variant_comparison
What chess variants have team play?
Tools called
find_variant_by_feature
When was Chess960 invented?
Tools called
history_note
Give me tips for playing Antichess
Tools called
beginner_tips

About

Fischer960 is a fully local, hand-curated reference for nine real chess variants. variant_info gives one variant's full detail: objective, board/setup, every difference from standard chess, complete topic-by-topic rules, tagged features, difficulty, pace and a history note. rule_lookup answers a specific rules question for one variant by topic, such as Chess960 + castling or Atomic + explosion. starting_position_rule explains a variant's starting setup, most useful for Chess960's randomization-and-castling rules and Horde's asymmetric pawn wall. term_glossary defines cross-variant vocabulary like drop, reserve, sitting, bare king and virtual castling. variant_comparison lines up two named variants' objective, category, difficulty, pace and tagged features side by side. find_variant_by_feature suggests variants matching a plain-language quality like team play, fast games, no draws or piece drops. history_note gives a variant's origin, approximate date and notable figures. beginner_tips gives a short curated list of tips for starting to play a specific variant. Keyless; fully local; zero upstream calls; nothing stored.

Sources: Original, hand-curated rule summaries covering nine real chess variants, technically reviewed for accuracy as of build date; fully local, zero upstream calls

Privacy

The publisher, Unify Dynamics LLC, states that tool inputs are processed in memory and not retained.

Data not collectedNo account, no profile, no stored prompts or results.
Privacy policyTerms

What it can do

8 tools, grouped by job. Every one is read-only or compute-only.

OpenAPI
Look Up a Variant3 tools
  • Variant infoFull detail for one chess variant: objective, board/setup, every difference from standard chess, the complete topic-by-topic rules, tagged…
  • Rule lookupAnswers a specific rules question for one named variant by topic — e.g. Chess960 + "castling", Atomic + "explosion", Bughouse + "communication",…
  • Starting position ruleExplains a variant's starting setup specifically, including castling where relevant.
Compare & Discover2 tools
  • Variant comparisonA side-by-side comparison of two named variants' objective, category, player count, difficulty, pace and tagged features, plus which features they…
  • Find variant by featureSuggests variants matching a plain-language quality, keyword-matched against each variant's tagged features, category, summary and rule differences.
Reference & Learn3 tools
  • Term glossaryDefinitions of chess-variant vocabulary used across this reference — drop, reserve, sitting, bare king, blast radius, virtual castling, mandatory…
  • History noteA variant's origin, approximate date, notable figures and any other historical notes.
  • Beginner tipsA short, curated list of tips for starting to play one named variant.

Information

PublisherUnify Dynamics LLC
CategoryGames & entertainment
LanguagesEnglish
Built forGlobal
CompatibilityAny MCP client · any agent · REST
Version0.1.0
MCP endpointhttps://fischer960.connectorbay.com/mcp
REST APIopenapi.json
SupportGet help · Status
CountryWorldwide

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Documentation

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Fischer960 — connector documentation

  • MCP endpoint: https://fischer960.connectorbay.com/mcp
  • REST API: POST https://fischer960.connectorbay.com/v1/tools/{tool_name}, described by the OpenAPI 3.1 spec at https://fischer960.connectorbay.com/openapi.json
  • Transport: Streamable HTTP, stateless, MCP specification 2025-06-18 or later
  • Authentication: none required. An optional Authorization: Bearer <key> raises rate limits.
  • Health: https://fischer960.connectorbay.com/health · Tool schemas: https://fischer960.connectorbay.com/tools.json
  • Publisher: Unify Dynamics LLC · connectorbay.com/fischer960 · agent@connectorbay.com

What Fischer960 is for

A hand-curated chess variants reference — rules, setup, glossary, comparisons and history.

What it does

Fischer960 is a fully local, hand-curated reference for nine real chess variants. variant_info gives one variant's full detail: objective, board/setup, every difference from standard chess, complete topic-by-topic rules, tagged features, difficulty, pace and a history note. rule_lookup answers a specific rules question for one variant by topic, such as Chess960 + castling or Atomic + explosion. starting_position_rule explains a variant's starting setup, most useful for Chess960's randomization-and-castling rules and Horde's asymmetric pawn wall. term_glossary defines cross-variant vocabulary like drop, reserve, sitting, bare king and virtual castling. variant_comparison lines up two named variants' objective, category, difficulty, pace and tagged features side by side. find_variant_by_feature suggests variants matching a plain-language quality like team play, fast games, no draws or piece drops. history_note gives a variant's origin, approximate date and notable figures. beginner_tips gives a short curated list of tips for starting to play a specific variant. Keyless; fully local; zero upstream calls; nothing stored.

What it is not

Not an official product of, or affiliated with, any brand, league, publisher, or organization it may factually mention. Fischer960 is a hand-curated reference and design tool, not a substitute for an official rulebook, certified instruction, or professional advice. Fully local, zero upstream calls, nothing stored.

Tools

Look Up a Variant

variant_info — Full detail for one chess variant: objective, board/setup, every difference from standard chess, the complete topic-by-topic rules, tagged features, difficulty, typical pace and a short history note. Use for "what is Crazyhouse", "explain Four-Player Chess", "how is Atomic different from normal chess". Args: name.

rule_lookup — Answers a specific rules question for one named variant by topic — e.g. Chess960 + "castling", Atomic + "explosion", Bughouse + "communication", Antichess + "capture". Matches the topic against that variant's own rule headings first, then against the rule text itself. Use for "what's the castling rule in Chess960", "how do drops work in Crazyhouse", "what happens when you capture in Atomic". Args: variant, topic.

starting_position_rule — Explains a variant's starting setup specifically, including castling where relevant. Most useful for Chess960's randomization-and-castling rules and Horde's asymmetric pawn wall, but returns the starting setup for every variant, including ones that just use the standard chess position. Use for "how does Chess960 randomize the back rank", "what's Chess960's castling rule", "how is Horde's board set up". Args: variant.

Compare & Discover

variant_comparison — A side-by-side comparison of two named variants' objective, category, player count, difficulty, pace and tagged features, plus which features they share and which are unique to each. Use for "compare Atomic and Crazyhouse", "Chess960 vs King of the Hill, what's different", "Bughouse vs Four-Player Chess". Args: a, b.

find_variant_by_feature — Suggests variants matching a plain-language quality, keyword-matched against each variant's tagged features, category, summary and rule differences. Use for "what chess variants have team play", "any variant that's usually fast", "which variant rarely ends in a draw", "variants with a randomized setup". Args: feature.

Reference & Learn

term_glossary — Definitions of chess-variant vocabulary used across this reference — drop, reserve, sitting, bare king, blast radius, virtual castling, mandatory capture, check count, and more. Use for "what does 'drop' mean in chess", "what's a bare king", "what's virtual castling". Args: term.

history_note — A variant's origin, approximate date, notable figures and any other historical notes. Use for "when was Chess960 invented", "who created Fischer Random chess", "history of Bughouse". Args: variant.

beginner_tips — A short, curated list of tips for starting to play one named variant. Use for "tips for playing Antichess", "how do I get started with Bughouse", "beginner advice for Horde". Args: variant, count.

Conventions

  • Read-only. Every tool reads public data or computes; nothing is written anywhere and nothing about the user is stored.
  • Result envelope. ok: true with data, or ok: false with a structured error (bad_input, not_found, upstream_error). degraded lists optional sources that were unreachable.
  • Rate limits. Free tier 60 tool calls/minute and 300/day per user (keyed on the user identifier supplied by the host agent, else client IP); Pro keys raise this. Over-limit calls return HTTP 429 with Retry-After. initialize and tools/list are never counted.

Support

agent@connectorbay.com · connectorbay.com/fischer960/support

Privacy policy

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Fischer960 — Privacy Policy

Effective 25 September 2026. Unify Dynamics LLC ("we", "us"), Menlo Park, California.

What Fischer960 is. Fischer960 is a connector (an MCP server and REST API) that AI assistants and personal agents call on your behalf for a hand-curated chess variants reference — rules, setup, glossary, comparisons and history. You interact with your assistant; the assistant sends us only the arguments needed for that one lookup.

What we receive. The arguments of each tool call, the technical headers needed to serve the request (an IP address or a client identifier supplied by the assistant, and a Pro API key if you have one), and standard server logs.

Everything is answered from a bundled, hand-curated reference file and nothing is stored. No request is forwarded to any third party — there is no upstream call at all, live or otherwise — and no query is logged in request bodies, recorded, or used to train anything.

What we do not receive or store. We do not receive your conversation with the assistant or your name, and we do not build a profile from your queries: each request is answered independently and nothing carries over between requests. Rate-limit counters (a client identifier and timestamps) are held in memory for at most 24 hours. Hosting-provider access logs, which contain IP addresses and request paths but not request bodies, are retained for up to 30 days for security and abuse prevention.

Sub-processors. None — the entire dataset is bundled with the server and answered locally. Hosting: Vercel (United States regions).

Legal bases and your rights. Our processing is necessary to provide the service you request through your assistant. Because we store no personal data beyond short-lived logs, requests to access, correct or delete personal data are usually satisfied automatically; you can still contact agent@connectorbay.com and we will respond within 30 days. We do not sell or share personal information and do not use your data to train models.

Children. Fischer960 is a general-audience service operated by the adult using the assistant.

Changes. We will post changes here with a new effective date.

Terms of service

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Fischer960 — Terms of Service

Effective 25 September 2026. These terms govern use of the Fischer960 connector ("the Service") operated by Unify Dynamics LLC ("we", "us").

  1. The Service. Fischer960 is a fully local, hand-curated reference for nine real chess variants.
  2. A reference, not professional advice. Fischer960 is an independent reference and hobby/game-design tool, not affiliated with or endorsed by any brand, organization, league, or publisher it may factually mention. It does not provide legal, financial, medical, or safety-certification advice, and is not a substitute for supervised instruction where real physical risk is involved.
  3. Content varies. Rules, terminology and conventions described here reflect commonly-cited general practice; local house rules, regional variants, and official governing-body rulebooks may differ.
  4. Acceptable use. Automated use within the published rate limits is welcome.
  5. Availability. The Service is provided "as is" without warranty. We may change, limit or discontinue it at any time.
  6. Data. Our Privacy Policy describes what we process. In short: your query is answered from a bundled reference file, and nothing is stored.
  7. Pro keys. Optional Pro API keys are issued at our discretion, are personal to the holder and may be revoked for abuse.
  8. Liability. To the fullest extent permitted by law, Unify Dynamics LLC is not liable for any loss arising from use of or reliance on the Service. Our total liability is limited to US $100.
  9. Governing law. California law; venue in San Mateo County, California.
  10. Contact. Unify Dynamics LLC · agent@connectorbay.com · https://connectorbay.com/fischer960

Support

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Fischer960 support

Email agent@connectorbay.com. We answer within two business days.

When you report a problem, include the question you asked your agent, roughly when, and which agent you used (for example Claude, ChatGPT or Gemini). Never send us passwords, account numbers or ID numbers. Fischer960 never asks for them.

Get Fischer960

Free · No sign-in · Read-only

Streamable HTTP, stateless, no authentication. Paste the endpoint into any MCP-capable agent.

https://fischer960.connectorbay.com/mcp
{
  "mcpServers": {
    "fischer960": {
      "type": "http",
      "url": "https://fischer960.connectorbay.com/mcp"
    }
  }
}