In the case of a large number of participants (or teams), in order not to increase the number of games and extend the date of the game, but also to arrange the rankings of each team, the group round robin is often used. After the number of groups is determined, they can be grouped by drawing lots or "snake arrangement". For example, if 16 teams in the team competition are divided into four groups, they will be grouped according to the following table:
The first group l, 8, 9, 16
Group 2, 7, 10, 15.
Group 3, 6, 1 1, 14.
Group 4, 5, 12, 13.
The figures in the above table are the serial numbers of each team, arranged according to their strength. In other words, the smaller the number, the stronger the strength, and the number on the number is equivalent to the ranking of the team. When drawing lots for grouping, if the above 16 team is still taken as an example, four or eight seeds should be determined first, and the seeds should be arranged in order, and then grouped according to the above "snake arrangement method" or "lottery method". Finally, the unseeded teams were assigned to each group by drawing lots.