4) The first TOP3 players vying for the Prize, during the period of September 23 - 30, 2019, must play at least 5 games with direct competitors - participants admitted to the tournament. The priority for issuing challenges is as follows: TOP3, TOP2, TOP1.
That is, TOP3 can challenge either TOP1 or TOP2, and the latter must accept the challenge.
TOP2 challenges TOP1, and the latter must accept the challenge.
If TOP1 receives challenges from both TOP3 and TOP2, then TOP3 has priority in playing against TOP1.
If there are no challenges for TOP1 and TOP2 from direct competitors, then any game counts towards the 5 mandatory games for the period of September 23-30.
Or is the Top 3 determined by the 23rd, and the winner is determined only among them?
Maybe it would be better to determine the Top 4 on a specific date and have them compete for the prize in an Olympic-style format: 1-4 and 2-3, and then a final between the winners? In this case, the player higher in the ranking chooses the map?