One reason is a very smart five year-old could tell you the algorithm for that top problem -- look at all possible moves to the end of the game and choose the one that makes you win.
一个原因是，一个聪明点的五岁小孩子 就已经能够告诉你上面那个问题的解决算法了-- 找出游戏结束之前所有可能的下法 选择赢面最大的一步来下