开源许可

对弈引擎

对局分析和电脑对手由 Rapfi 驱动。Rapfi 运行在我们的服务器上，从不发送到你的浏览器。Rapfi 采用 GNU General Public License v3.0 许可，其源代码可从该项目获取。其神经网络权重来自 rapfi-networks，并已贡献至公共领域（CC0-1.0）。

• Rapfi GPL-3.0
• rapfi-networks CC0-1.0

西洋双陆棋引擎

西洋双陆棋的电脑对手由 GNU Backgammon（gnubg）驱动。gnubg 在我们的服务器上以独立容器中的独立进程运行，从不发送到你的浏览器。GNU Backgammon 采用 GNU General Public License v3.0-or-later 许可，其源代码可从该项目获取。

• GNU Backgammon GPL-3.0-or-later

国际象棋引擎

国际象棋的电脑对手由 Stockfish 驱动，它在我们的服务器上作为独立进程运行于自己的容器中，仅通过网络协议与网站通信。它未与 Turnpan 的代码链接，也不会发送到你的浏览器。Stockfish 采用 GNU General Public License v3.0 许可，源代码可从该项目获取。

• Stockfish GPL-3.0

浏览器内分析引擎

赛后分析仅在你打开时于浏览器中运行，使用 stockfish.js 19.0.0（由 nmrugg 编译为 WebAssembly 的 Stockfish 19）。Stockfish 和 stockfish.js 依据 GNU 通用公共许可证 v3.0 授权。引擎文件由本站提供；许可证文本和源码说明的链接见下方。

• 许可证文本（GPL-3.0）
• 所提供版本的源码说明
• stockfish.js v19.0.0
• Stockfish

Stockfish 19 / stockfish.js 19.0.0, GPL-3.0

国际象棋棋子

国际象棋棋子：Colin M.L. Burnett（Cburnett），BSD 许可，来自 Wikimedia Commons。许可证全文如下。

• cburnett BSD-3-Clause

Copyright (c) Colin M.L. Burnett. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.