Take 1 first, and the remaining 5 1. After the other party takes it, the number you take is equal to 5. For example, if he takes 3, he takes 2.
If the other party takes it first, it is necessary to design in the middle, and make use of the other party's mistakes to make the remaining quantity after a certain period of time a multiple of 5 plus 1.
According to the rules of the title, if Xiao Ming wants to win, he must remember the total number of cards held by two people and try to get the key cards: 1, 6,1,16,21,26,365438. As long as you get these cards, you will win every game.