版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/chessground/9.2.1/chessground.js
- https://cdn.bootcdn.net/ajax/libs/chessground/9.2.1/chessground.min.js
Chessground is a free/libre open source chess UI developed for lichess.org. It targets modern browsers, as well as mobile development using Cordova.