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I believe that a tournament with a format similar to the one currently being held for Heroes of Might and Magic II is optimal for versions with a smaller player base.
In reality, neither Haven, nor Academy, nor Dungeon will be able to field a full team of five players capable of playing the required number of games within the allotted time. This is because the total number of active players in Heroes of Might and Magic II online in the Russian-speaking community is only 15-20.
In Heroes of Might and Magic III and V, there may be that many players, and it might be possible to gather them, but in any case, this will lead to the tournament being prolonged. I think the optimal format would be a tournament in which each faction has three players. Mobile teams with a strong lineup of participants, similar to the recent clan tournament.