According to the elimination rules, if there are participants in each round, the number of participants in the last round should be 2, 4 in the penultimate round, 8 in the penultimate round and 16 in the penultimate round.
If only 13 people take part in the competition, three people can worship in the first round, so they can be arranged in the upper and lower areas respectively, and the competition map is arranged in EXCEL in advance, such as 1 8, 13, and the next arrangement is very clear.
So it is divided into upper and lower half areas, the upper half area 1-7 and the lower half area 8- 13. The first round of the first half 1 bye, against winners 2 and 3, against winners 4 and 5, against winners 6 and 7, and then compete for the championship in the first half. Similarly, No.8 and 13 had a bye in the first round, and No.8 was the winner against No.9 and 10, 13.