Today’s six World Cup matches taught me a lesson. Sure enough, by the third round of the group stage, under-the-table collusion matches appeared frequently, and the probability of guessing correctly dropped noticeably. Next, after the competition enters the knockout stage, with no factors such as points calculation and under-the-table collusion, the matches will return to being determined by overall strength and on-the-spot performance; the stability of predictions is usually higher than it is in the third round of the group stage.