Minimum number of rounds for number of players:

1 Round  =   2       Players
2 Rounds =   3 -   4 Players
3 Rounds =   5 -   8 Players
4 Rounds =   9 -  16 Players
5 Rounds =  17 -  32 Players
6 Rounds =  33 -  64 Players
7 Rounds =  65 - 128 Players
8 Rounds = 129 - 256 Players
9 Rounds = 257 - 512 Players

For Premiere Sanctioned Events (Class A, B, C):

 5 Rounds =  26 -  42 Players
 6 Rounds =  43 -  73 Players
 7 Rounds =  74 - 128 Players
 8 Rounds = 129 - 226 Players
 9 Rounds = 227 - 409 Players
10 Rounds = 410+ players