实现了服务器：数据的保存及转发；
联网对战：桌位的选择、悔棋、认输、和棋；
聊天模块：文本聊天、语音聊天；
练习模式：难度的划分、悔棋。(The server is implemented: data storage and forwarding;
Network play: table selection, undo, defeat, and;
Chat module: text chat, voice chat;
Practice mode: Division, undo the difficulty.)