Six classes, each class sends one person to participate in badminton singles competition, how to organize and decide one, two, three.

Method 1: Six-person round robin, with points system to decide the first, second and third place. In the case of the same integral, it depends on the winning or losing relationship or score.

Method 2: Divide into two groups, A and B, with three people in each group and a three-person round robin.

The top two in the group are promoted. Group A is the first pair, Group B is the second pair, Group B is the first pair, Group A is the second pair, winners are the first pair and the second pair, and losers are the third pair.