The later the knockout, the higher the ball, and it is absolutely impossible to have a bye. No matter what rules are used to remedy it, it is difficult to satisfy the players. It is better to change the previous knockout into a single round or a group round.

If we really want to make a single elimination system, it seems that there is only one way: to set seed players and advance directly to the second round, so as to ensure that the number of players in the second round is 2 to the n power.