How to group odd numbers?

1, when there is a clear high and low foundation, consider a higher level player bye.

2. If there is no basis, draw lots for bye players.

3. Adopt the flexible round robin system, for example, 35 contestants are divided into 12 groups, 1 groups to 1 1 groups, and three people in each group will play a single round robin, and the top two players in each group and two people in 12 groups will directly enter the next round of round robin.