If it is a single round robin, a group cycle is singular 13, which means * * * has 13 rounds.
There is a bye-bye in each round;
If it's a single knockout, draw a three-person bye in the first round, two in the upper half and one in the lower half.
In the case of 12 single knockout, the first round of four-person bye, the principle of assigning bye numbers is that even numbers are evenly distributed in the upper half, and odd numbers are given priority to one more in the upper half, which is the arrangement principle of badminton single knockout.