The 19 team was divided into four groups: A, B, C and D, with 5 teams in Group A, 5 teams in Group B, 5 teams in Group C and 4 teams in Group D for group round robin. In this way, ABC's team in the third group has four draws, and each team in the D group has three draws. On the surface, Group D saved one physical strength, but it was decided by lottery, which was fair. In order to save time, all teams will play at the same time. The two teams that have won four or three games win. If both teams are two wins and two losses, then the two teams will have an extra match to decide the top two. The eight teams entering the semi-finals will compete (or draw lots to decide which two groups will compete), and the top four will be eliminated and enter the finals. In the final, the points system can be adopted, that is, the winner of each group will get 2 points (the play-off will not be scored), the theoretical maximum score will be 8 points, the winner will get 2 points, the maximum score will be 10, and the maximum score of Group D will be 8 points. Another possibility is to enter the final with 6 points (4 points in the group stage and 6 points in the play-off), and the two teams with high points will face each other in the final, and the teams with low points will face each other. Two winning teams compete for the first and second place, and two losing teams compete for the third place. The final does not use the integral system, but can be a round robin system. 1, 2, 3, 4 decides the winner.
Such a team can play eight games at most, and three or four hours is enough.
I hope I can help you solve the problem. Goodbye!