Checkers是一个经典的棋盘类游戏，它的目标是吃掉对方所有的棋子。
这个游戏看似简单，却需要玩家具有较高的专业技巧。
GuiCheckers快捷键
'3' - Add Current Board position / adjust towards '0'
'2' - Add/Adjust to being good for red
'4' - Add/Adjust to being good for white
'6' - Remove Position
'C' - Clear Opening Book in memory
'S' - Save Opening Book