(2) Although the group round robin can correctly arrange the ranking of teams (or people), it is difficult to use because of the large number of teams (or people), which brings difficulties to the organization and management of the competition. In this case, group round robin can be used. The most commonly used arrangement method of group round robin is "snake arrangement", that is, the sequence numbers are arranged according to the strength of each team (usually according to the ranking of the last game). The smaller the serial number, the stronger the strength, on the contrary, the weaker the strength. When grouping, the strength of each group is required to be average, that is, the serial numbers of each group are added. On the basis of "snake arrangement", some ball games divide seed teams and non-seed teams into groups by lottery, that is, No.65438 +0-4 team (seed team) is fixed in No.65438 +0-4 group or enters No.65438 +0-4 group by lottery; Then the numbers 5- 8, 9- 12, 13- 16 are drawn into the 1-4 group respectively. However, after the end of the grouping period, the second stage of the competition should be added and all the rankings should be discharged. There are two common methods: 1. For example, in the first stage, each group is divided into four groups for group round robin, and in the second stage, the first place in each group is a group for single round robin, and1-4 is decided; The second place in each group is a group, and the fifth to eighth places are decided; And so on. 2. In the first stage, the cross race is divided into two groups for round robin. In the second stage, the top two players in each group will compete to decide the number of places such as champion, runner-up and runner-up. In this way, the 5th-8th places are decided by 3 or 4 people in each group. 5 or 6 people in each group cross to decide No.9-12; According to this push.