Single round robin is a game played by players in turn.
Group round robin with less than 8 players can be divided into two groups. First, two seeds were identified and put into two groups respectively, and other non-seeds were drawn into each group by lottery. You can also use the "snake arrangement method" to group, the first group: 1, 3, 5, 7; The second group: two, four, six and eight. The smaller the number, the stronger the strength.
Single knockout: When there are only two seeds, the 1 seed comes first, and the No.2 seed comes last. If there are 4 seeds, No.3 and No.4 seeds will be arranged at the top of the second 1/4 area and at the bottom of the third 1/4 area respectively by drawing lots. Other non-seeds are arranged at the position of 1 by drawing lots.
8───┘───┐
3───┐───┘──────┐
6───┘ │
5-winner
4───┘───┐──────┘
7───┐───┘
2───┘