17, 18 or how are the 9 teams grouped?

One team will be eliminated in each knockout, so 17, 18 and 9 teams will participate, and the number of games will be 16, 17 and 8 respectively, as long as there is no bye at the beginning of the second round and it is the power of 2.

17 group knockout, five rounds.

The first round, draw lots, 15 team bye, team 2 in the first round; In the second round, 16 team participated; Quarterfinals; Semifinal; final

18 group knockout, five rounds

The first round, draw lots, 14 team bye, the first round of 4 teams; The second round,16; Quarterfinals; Semifinal; final

Group 9 elimination, four rounds

The first round, draw lots, 7 teams bye, 2 teams play the first round; Quarterfinals; Semifinal; final

Other teams can also be grouped according to this principle.