Competition schedule: on the first day, A versus B, C versus D, on the second day, A versus C and B, D, and on the third day, A, D and B, C.
One group is eliminated, and the top three compete for the final.
If the venue permits, we can do it together. The corresponding game schedule will be shortened a lot.
If time is really tight, we can adopt the group elimination system and draw lots, for example, A and B are divided into one group and C and D are divided into one group. The winners of each group entered the finals. If there must be the top three, plus the resurrection match.