Have you ever heard of reversi? It is a game in which two black and white frames are placed between the opponent’s frames to form a frame of your color. There is an interesting rule in this game. If you can’t place a piece, you have to pass. However, even if you don’t like it, as long as there is a place to put it, you “have to put it” according to the rules. In other words, …… If you keep your opponent in a position where there is only one place for him to place his hand, you have complete control over his hand. “Rule by rule”. No matter how agitated you are, the rules force you to place your hand in any way that suits your opponent.