Rules for organizing, conducting, and participating in online Heroes of Might and Magic III tournaments.

The least time-consuming option for playing Team Kings. Moreover, the factor of randomness is much lower here than in all other proposals.

As for the lack of motivation after three rounds, this is an inevitable consequence of the group system. Therefore, I believe the best scheme for tournaments is a double-elimination bracket. Well, for really top-tier players, a standard bracket could also work.