Built on good ideas.

ChessReign is an original product by Nyza Creations LLC.

Chess rules

chess.js provides legal move validation and game notation under the BSD-2-Clause license.

Game analysis

Server-side game review uses Stockfish 18 via Stockfish.js, licensed under GPLv3. Source code and build instructions are available from the upstream project. Stockfish and its contributors are independent of ChessReign. Local practice opponents use a separate, lightweight search implementation and have no claimed measured Elo.

Puzzle positions

Our initial 1,600 puzzles come from the Lichess puzzle database, released under CC0. Every included solution is checked for legality. Each puzzle links back to its source game.

Design

The ChessReign crowned-knight brand artwork was created with AI image generation and selected for this product. Board piece geometry and interface design are original. Interface icons are from Lucide, licensed under ISC. Typography uses DM Sans and Libre Caslon Display, under the SIL Open Font License.