Kingside Chess - credits and licences
=====================================

Kingside Chess (c) 2026 Sonujeet. The game's own code is released under the
GNU General Public License v3 (GPLv3) because it ships with Stockfish (GPLv3).
Full source code: https://kingside-chess-app.sites.tab.bot/ (and the "source code"
download on the itch.io page).

Chess engine
- Stockfish 19 Lite and Stockfish 10, by the Stockfish developers
  (https://stockfishchess.org), WebAssembly builds by Nathan Rugg (stockfish.js,
  https://github.com/nmrugg/stockfish.js). GPLv3, see engine/COPYING.txt.

Chess rules
- chess.js by Jeff Hlywa, BSD 2-Clause licence (https://github.com/jhlywa/chess.js).
  Copyright (c) 2025, Jeff Hlywa. Licence text is in the header of vendor/chess.js.

Piece sets (taken from the Lichess project, https://github.com/lichess-org/lila)
- Classic (cburnett): Colin M.L. Burnett, GPLv2 or later
- Merida: Armando Hernandez Marroquin, GPLv2 or later
- Chessnut: Alexis Luengas, Apache License 2.0 (https://github.com/LexLuengas/chessnut-pieces)
- Fantasy and Spatial: Maurizio Monge, MIT (https://github.com/maurimo/chess-art)

Data
- Puzzles: the Lichess puzzle database (https://database.lichess.org/#puzzles), CC0 1.0
- Opening names: lichess-org/chess-openings (https://github.com/lichess-org/chess-openings), CC0 1.0

GIF maker (Share your game)
- gifenc by Matt DesLauriers, MIT (https://github.com/mattdesl/gifenc), in vendor/gifenc.js.
  Licence text: licenses/MIT-gifenc-Matt-DesLauriers.txt

Ratings
- Glicko-2 rating system by Mark E. Glickman (http://www.glicko.net/glicko.html); the
  calculation in server/glicko2.js is our own code written from his published paper.

Licence texts: see the licenses/ folder (GPLv3, MIT, Apache 2.0, BSD 2-Clause).
The GPLv2-or-later piece sets are used under the GPLv3 option.

Everything else
- Board colours, move sounds (made with code using Web Audio, with no audio files),
  icons and layout are original to Kingside Chess. The eight bot characters (Chintu, Meera Didi,
  Rocky, Professor Iyer, Zara, Vikram, Natasha, Titan), their avatars (bots/*.svg, drawn as
  code) and their chat lines are original to Kingside Chess too. The app uses the device's own fonts.
- The Android robot is reproduced or modified from work created and shared by Google
  and used according to terms described in the Creative Commons 3.0 Attribution License.
- Windows app: built with Electron (MIT) and Chromium. Their licences are in the install
  folder (LICENSE.electron.txt, LICENSES.chromium.html).


v1.8 Crown Shop items:
- Piece sets "Gold & Onyx" (pieces/gold) and "Ruby & Ivory" (pieces/ruby): recoloured versions of the cburnett set by Colin M.L. Burnett (GPLv2+ / CC BY-SA 3.0), recoloured for Kingside Chess, same licence (CC BY-SA 3.0 / GPLv2+).
- Boards "Royal Gold", "Midnight", "Sandalwood": CSS colours made for Kingside Chess (GPLv3 with the app).
- Frames and emoji avatars: CSS made for Kingside Chess; the avatars are the phone's own emoji font.