How to play the 27-player single defeat system in billiards competition?

The first round was a bye of 32,5 people in 16;

Round 2 16 into 8

8-4 in the third round

Fourth round semi-final

Fifth round final

Every round of drawing lots. The first round 1- 1 1 two groups of numbers plus 5 bye-lot, * * *1* 2+5 = 27 lots, 1 1 single defeat eliminated.