Open Source Acknowledgements

Third-Party Licenses

Chess Master is built with pride on the shoulders of giants. We gratefully credit the open-source projects, fonts, and engines that power this application.

♟️ Stockfish Chess Engine

GNU GPL v3.0

Copyright © 2004-2026 The Stockfish Developers (see AUTHORS file in upstream repository).

Stockfish is a free, powerful Universal Chess Interface (UCI) chess playing engine derived from Glaurung 2.1. Stockfish is distributed under the terms of the GNU General Public License version 3 as published by the Free Software Foundation.

GPLv3 Source Code Availability Notice: In full compliance with Section 6 of the GNU General Public License v3, the complete corresponding source code and build instructions for the Stockfish engine utilized by Chess Master are freely accessible to all users at:

🔗 https://github.com/official-stockfish/Stockfish

GNU GENERAL PUBLIC LICENSE Version 3, 29 June 2007 Copyright (C) 2004-2026 The Stockfish developers (see AUTHORS file) This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.

🔤 Inter Typeface

SIL OFL 1.1

Copyright © 2016-2024 The Inter Project Authors (Rasmus Andersson).

Inter is a typeface carefully crafted and designed for computer screens. This font software is licensed under the SIL Open Font License, Version 1.1.

🔗 Upstream Repository: https://github.com/rsms/inter

SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007 Copyright (c) 2016-2024 The Inter Project Authors (https://github.com/rsms/inter) This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is copied in assets/font/OFL.txt and is also available at: https://openfontlicense.org Permission is hereby granted, free of charge, to any person obtaining a copy of the Font Software, to use, study, copy, merge, embed, modify, redistribute, and sell modified and unmodified copies of the Font Software, subject to the following conditions: 1) Neither the Font Software nor any of its individual components, in Source or Binary forms, may be sold by itself. 2) Bundled or embedded copies must include the above copyright notice.

🎨 Classical Chess Piece Vector Graphics

CC BY-SA 3.0

The classic vector chess pieces utilized in Chess Master are based on the standard Wikimedia chess piece set illustrated by Colin M.L. Burnett, distributed under the Creative Commons Attribution-ShareAlike 3.0 Unported license (CC BY-SA 3.0).

🔗 License terms: https://creativecommons.org/licenses/by-sa/3.0/

📦 Flutter & Dart Community Packages

MIT • BSD-3 • Apache 2.0

Chess Master utilizes the following open-source Flutter packages:

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files, to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so.