C#版五子棋源码。实现功能：可选择白棋先或黑棋先，可定位棋子，上一步下的棋有箭头标志。规则采用标准规则，加入了双三禁手等。-C# source code version of backgammon. Function: first, choose White or Black first, to locate pieces, the next step on the move with the arrow mark. Rules using standard rule, joined the t