Professional Go players think differently from mathematicians. This is reflected in many problems, the most important of which is the rules of Go. Japan used to be the leader of modern Weiqi for 200 years, but before the middle of the 20th century, Weiqi had no written rules. It was not until Wu Qingyuan caused controversy in a semi-final that the written rules of Japanese Go were formulated. However, the core of Japanese rules-digital law, is full of loopholes in logic. For example, because of the number method, Japanese rules define the four corners as dead chess, even if it is possible to revive. For another example, because of the numbering method, Japanese rules force the chess form of "not mentioning three eyes" to be three eyes. Every time the rules are revised, the Japanese are constantly mending one such "small" problem after another, but they can't solve the problem perfectly.