A 20-man draw

Does the landlord want photos of more than 20 badminton players eliminated?

I think: taking 20 people as an example, there should be at most four seeded players going to different areas of 1/4, among which 1 and No.2 seeded players are fixed at the head and tail (that is, 1 is at the top of the upper half, No.2 seeded player is at the tail of the lower half, and No.3 and No.4 need to draw lots to decide the other two upper or lower half of 65438.

Next, I attach the specific game map when 20 people are eliminated (and indicate the position of the seed players):

The above is a single knockout. If the landlord has enough time or space, will 20 people consider playing group singles first and then crossing the knockout stage? If possible, 20 people can be divided into 4 groups, with exactly 5 people in each group. The top two in each group are required to qualify, and then the second stage of cross elimination is carried out.