日本围棋高手升田幸三讲过一个小故事：年幼时，他常常跟着父亲进山砍柴。后来，他发现一位老伯伯也常到山里砍柴，但总是来得晚，走得早，中间还不时歇息一会儿。令他奇怪的是，老伯伯每次砍的柴总是比父亲要多一些。一开始，他还以为老伯伯的斧子更犀利或者砍的柴都是木质比较 Japanese go master Shimadzu three told a little story: when young, he often followed his father into the mountains cut firewood. Later, he found that an old man often went to the mountains to cut firewood, but it was always late, going early and resting in the middle for a while. Strange to him, the old uncle always cut more wood than his father. At first, he also thought that the old uncle’s ax is more sharp or chopped wood is woody