Although the single round robin tournament can correctly arrange the ranking of each team (or person), it is difficult to adopt it when there are many teams (or people) and a large number of players bring 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. In some ball games, on the basis of "snake arrangement", the seed team and the non-seed team are grouped by lottery, that is, the No.65438 +0-4 team (seed team) is fixed in the No.65438 +0-4 group or enters the 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. In the first stage, each group was divided into four groups for group round robin. In the second stage, the first place in each group was a group for single round robin, and 1-4 people were decided. The second place in each group is a group, and the fifth to eighth places are decided; And so on.
2. The first stage of the cross race is divided into two groups for round robin. In the second stage, the top two players in each group will cross the competition and decide the first, second and third places. 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; And so on.
The teams (or people) participating in the single elimination tournament play in the arranged order, and the winner enters the next round, and the loser is eliminated until the champion is decided, which is called the single elimination tournament. The number of single elimination matches is relatively small, which is conducive to arranging more players to participate in the competition in a short time. However, this method is unreasonable, incomplete and opportunistic, and some measures must be taken to overcome these defects in order to play its role in practical application.