# CH960 — Chess960 (Fischer random chess) online

> CH960 (formerly Royal Shuffle) is a free Chess960 / Fischer Random
> training and research project: play people online, learn from zero,
> solve 30,000+ engine-verified puzzles covering all 960 starting
> positions, follow a 1000-day course and train with interactive
> mentors. Free (GPLv3-licensed client), no ads, no purchases, no
> tracking. Android app + this website. Languages: en (default), ru,
> es, zh, hi, ar, pt, fr, de, ja — same paths with /{lang}/ prefix.

Key facts:
- Chess960: the back-rank pieces start in one of 960 arrangements; castling
  always ends on the classical squares (g1/c1 for White).
- Every starting position has a page: https://ch960.com/sp/ (0-959; /sp/518 is
  the classical chess setup).
- Position nomenclature: each of the 960 setups belongs to one of six named
  families — ThroneGuard, ThroneScout, BastionGuard, BastionScout,
  RampartGuard, RampartScout. Glossary + machine-readable dataset:
  https://ch960.com/nomenclature (JSON https://ch960.com/nomenclature/sp_families.json,
  CSV https://ch960.com/nomenclature/sp_families.csv).
- 30096 tactics puzzles, each playable in the browser:
  https://ch960.com/puzzles (single puzzle: /p/{id}).
- 1000-day course, one lesson + puzzles per day: https://ch960.com/course
  (single day: /course/day/{n}).
- Interactive lessons from zero: https://ch960.com/learn
- Daily puzzle: https://ch960.com/daily/today
- Author: Roman Morozov — https://ch960.com/author
  (Facebook: https://www.facebook.com/MRoman31)
- Android APK: https://ch960.com/download/latest
- Source code: GPLv3-licensed; available to recipients on request (public release planned).

## Core pages
- [Starting positions](https://ch960.com/sp/): facts for each of the 960 setups
- [Puzzles](https://ch960.com/puzzles): themes from mate-in-1 to Chess960-specific tactics
- [Learn](https://ch960.com/learn): rules, Chess960 castling, opening principles
- [Course](https://ch960.com/course): the 1000-day path from beginner to club player
- [Nomenclature](https://ch960.com/nomenclature): the six position families plus the
  Shuffle Rating, Target Rating, Mirror Twin and Key-Square Tag terms
  (DefinedTermSet + downloadable Dataset)
- [Open data](https://ch960.com/data): downloadable datasets — position families
  (JSON/CSV) and 30,000+ puzzles (JSON packs), CC0
- [Methodology](https://ch960.com/methodology): how puzzles are mined and verified
  (Stockfish, depth >= 20, forcedness validator)
- [Balance of all 960 positions](https://ch960.com/balance): the Morozov
  Balance Index (MBI) — how large White's opening edge is in each starting
  position, on a 0-100 scale. Author of the methodology: Roman Morozov.
  Dataset https://ch960.com/balance/sp_balance.json (and .csv), CC BY 4.0.
- [MBI methodology](https://ch960.com/methodology/balance): fixed node budget,
  single-threaded reproducible search, self-play validation, stated limits,
  and a one-command re-check of any single position

## Guides (en, ru)
- [Chess without opening memorization](https://ch960.com/chess-without-opening-memorization)
- [Learn Chess960 from zero](https://ch960.com/learn-chess960)
- [Think from move one](https://ch960.com/think-from-move-one): the project motto explained
- [Castling in Chess960](https://ch960.com/chess960-castling)
- [Chess960 vs classical chess](https://ch960.com/chess960-vs-classical-chess)