# Cat Chess

> Free, privacy-respecting online chess platform combining classic FIDE strategy with charming feline aesthetics, customizable feline pieces, campaign biomes, tactical puzzles, and intelligent cat AI opponents.

## Project Overview
- **Project Name:** Cat Chess
- **Main Website:** https://cat-chess.com
- **Play Online Application:** https://play.cat-chess.com
- **German Portal:** https://cat-chess.com/de/
- **License / Cost:** Free to play in browser (Zero pay-to-win, no registration required, privacy-first)
- **Operator:** MyQuests Digital - Web & Search (Olivier Jacob, Hamburg, Germany)

## Core Features & Game Modes
- **Classic Chess (FIDE-Compliant):** Standard chess rules with feline pawns, knights, bishops, rooks, queens, and kings. Full support for castling, en passant, promotion, threefold repetition, and the 50-move rule.
- **Story Campaign:** 4 faction campaigns with 48 chapters across rich biomes (Sun Paws / Crystal Kingdom, Shadow Claws, Moonlit Accord, Eternal Paw) with a 3-star rating progression system.
- **Daily Tactics Trainer & Puzzles:** Hand-crafted tactical puzzles with checkmate-in-one/two/three patterns, smothered mates, and real-time Web Audio sound effects.
- **AI Opponents:** 4 difficulty tiers from Kitten (~600 ELO), House Cat (~1200 ELO), Alley Cat (~1800 ELO), to Grandmaster Meow (~2400+ ELO).
- **The Sphinx (Boss AI):** Unbeatable cat grandmaster engine (~3650+ ELO) powered by client-side WebAssembly Fairy-Stockfish. Zero rating loss on defeat.
- **Cross-Platform Multiplayer:** Peer-to-peer custom match rooms with feline room codes (e.g. PURR-7391), real-time clocks (Bullet, Blitz, Rapid, Classical), cat emotes, and spectator mode.
- **Coming Soon Modes:** Mystic Pawns, Fog of Paws, Duck Chess (Cat Blocker), Crazyhouse Cats, Mini Chess, 3D WebGPU Chess, Atomic Cat Chess (Explosive Pawns), and Chess960 (Fischer Random).

## Interactive Openings & Study
- **Cat Chess Opening Explorer:** Interactive board demonstrating 6 classical and cat-themed opening lines (The Feline Sicilian, Royal Meow Ruy Lopez, Calico Caro-Kann, Persian Queen's Gambit, Panther King's Indian, Scottish Fold Scotch Game).
- **The 3 Golden Rules:** Center control ('claim the scratch tree'), minor piece development ('stretch the claws'), king safety ('curling up in a safe box').
- **Tactical Traps & Defenses:** Analysis of Scholar's Mate, Legal's Trap, Fried Liver Attack, Elephant Trap, Noah's Ark, and Blackburne Shilling.

## Key URLs & Sitemaps
- **English Homepage:** https://cat-chess.com/
- **German Homepage:** https://cat-chess.com/de/
- **Learning Hub (EN):** https://cat-chess.com/learn/
- **Learning Hub (DE):** https://cat-chess.com/de/lernen/
- **Game Modes:** https://cat-chess.com/modes/
- **Tactics & Puzzles:** https://cat-chess.com/puzzles/
- **Opening Explorer (EN):** https://cat-chess.com/openings/
- **Opening Explorer (DE):** https://cat-chess.com/de/eroeffnungen/
- **The Sphinx AI:** https://cat-chess.com/the-sphinx/
- **Press & Streamer Kit (EN):** https://cat-chess.com/press
- **Press & Streamer Kit (DE):** https://cat-chess.com/de/presse/
- **Cat Chess Sets & Gifts Guide (EN):** https://cat-chess.com/gifts/
- **Cat Chess Sets & Gifts Guide (DE):** https://cat-chess.com/de/geschenke/
- **Strategy & Culture Blog:** https://cat-chess.com/blog/
- **Strategy & Culture Blog (DE):** https://cat-chess.com/de/blog/
- **Legal Notice / Impressum:** https://cat-chess.com/impressum
- **Privacy Policy:** https://cat-chess.com/datenschutz
- **Terms of Service:** https://cat-chess.com/terms
## Editorial Guides & Strategy Magazine
- **Feline Openings Guide:** https://cat-chess.com/blog/best-chess-openings-with-cats (DE: https://cat-chess.com/de/blog/schach-eroeffnungen-katzen)
- **En Passant Rule Guide:** https://cat-chess.com/blog/en-passant-chess-secret-rule (DE: https://cat-chess.com/de/blog/en-passant-geheime-regel)
- **Castling Deep Dive:** https://cat-chess.com/blog/how-castling-works-in-chess (DE: https://cat-chess.com/de/blog/wie-die-rochade-funktioniert)
- **Knight Fork Tactics:** https://cat-chess.com/blog/the-knight-fork-tactic-explained-with-cats (DE: https://cat-chess.com/de/blog/die-springer-gabel-taktik-erklaert)
- **Pins & Freezing Pieces:** https://cat-chess.com/blog/the-pin-in-chess-how-to-freeze-enemy-pieces (DE: https://cat-chess.com/de/blog/fesselung-im-schach-figuren-lahmlegen)
- **Deflection Sacrifices:** https://cat-chess.com/blog/deflection-tactics-in-chess-sacrifice-guide (DE: https://cat-chess.com/de/blog/ablenkungsopfer-schach-taktik-guide)
- **2-Move Checkmate Patterns:** https://cat-chess.com/blog/checkmate-in-2-moves-puzzle-patterns (DE: https://cat-chess.com/de/blog/schachmatt-in-2-zuegen)
- **Daily Puzzle Streaks:** https://cat-chess.com/blog/daily-chess-puzzles-tips-and-streak-rewards (DE: https://cat-chess.com/de/blog/taegliches-schach-puzzle-loesungen)
- **Chess ELO Ratings Guide:** https://cat-chess.com/blog/chess-elo-rating-explained-kitten-to-grandmaster (DE: https://cat-chess.com/de/blog/elo-rating-erklaert-katzen-schach)
- **Cat AI Opponents Lore:** https://cat-chess.com/blog/the-4-cat-ai-opponents-kitten-to-grandmaster (DE: https://cat-chess.com/de/blog/die-4-katzen-ki-gegner)
- **Cat Chess vs. Mittens:** https://cat-chess.com/blog/cat-chess-vs-mittens (DE: https://cat-chess.com/de/blog/mittens-vs-cat-chess)
- **Cozy Gaming & Couples:** https://cat-chess.com/blog/why-cozy-games-boom-2026 (DE: https://cat-chess.com/de/blog/warum-cozy-games-boomen) & https://cat-chess.com/blog/game-to-play-with-girlfriend (DE: https://cat-chess.com/de/blog/schach-fuer-paare)

- **Full LLM Context:** https://cat-chess.com/llms-full.txt