棋盘游戏系统之网络五子棋（Swing +Socket)实现，人性化的悔棋功能，在双方同意的情况下可以悔棋，提供聊天功能，让游戏者保持沟通，界面好看，功能齐全。-Backgammon board game system of the network (Swing+ Socket) implement humane undo function, in the case of mutual consent can undo offers ch