Open-source licences
Tabiya is built on open chess software. The components below are included under their own licences, which travel with them; nothing here restricts your rights under those licences.
Stockfish 18
The chess engine behind drills, scans and puzzle checking (WebAssembly build, unmodified).
Licence: GNU General Public License v3.0 · full text · source code
chessground
The board you play on (lichess.org's board renderer, unmodified).
Licence: GNU General Public License v3.0 or later · full text · source code
chess.js
Move generation and PGN parsing.
Licence: BSD-2-Clause · full text · source code
Corresponding source
As required by the GNU GPL, the complete corresponding source code for the GPL-licensed components as shipped in this app, and for the code that links to them, is available on request for at least three years from the date you received the app. Email dentaco.alex@gmail.com with the app version and you will receive it at no charge beyond the cost of delivery.