Is it a round robin? Or the knockout? For round robin, the number is random 1~8, and the first round: 1-8, 2-7, 3-6, 4-5. Round 2: 8-7, 1-6, 2-5, 3-4. The third round: 7-6.

The knockout stage is simpler. It's good to be eliminated all the time, but in the first round, four games will be drawn, and the winner will be decided in the second round, two games, the third round, the final and the second round.