What are the arrangement rules of basketball team round robin?

For example, there are 16 people participating in the competition. In order to make the number of teams in each group even, it can be divided into 4 groups with 4 teams in each group. If time and funds permit, and you want to play more games, you can also divide into two groups, with 8 teams in each group. Divided into four groups, the "seed team" can be divided into four groups, eight groups, and drawn into the group, or 1, 8, 2, 7, 3, 6, 4, 5 (according to the ranking of the last competition).

In another serpentine arrangement, 1, 4, 5 and 8 "seed teams" are arranged in the first group, 2, 3, 6 and 7 "seed teams" are arranged in the second group, and other teams are drawn into this group.

If the single round robin system is adopted in the final of the second stage, 5 to 8 players will be decided by taking the 1 names of the four teams (the 3rd and 4th names of the two teams) as a group. The rest and so on, determine all the rankings.

In the second stage of the finals, if the second round with the same name is adopted, the runner-up of 1 in the two groups will win the championship, and the second runner-up in the two groups will win 3 to 4 places, and so on, and all the rankings will be determined.

In the final of the second stage, if a cross match is adopted, 1 in Group A will compete with the second place in Group B, and 1 in Group B will compete with the second place in Group A in the semi-finals. Then the winners of the two games will decide the champion and runner-up, and the losers will decide 3 or 4. The rest of the rankings are also conducted according to the above cross method. If two teams each have five teams, the remaining teams can't use cross-matches, and the final ranking can also be decided by the second match with the same name. This matter should be stipulated in the competition rules, and the above situation should be emphasized in the mixed system.