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In my opinion, random race selection is not the right approach, and I am against it, as race selection is also a part of the strategic battle.
It is possible to divide the players into strong and weak, but it will take a lot of time (if done correctly) and cause a lot of controversy. I suggest doing this for the next tournament.
As for the race selection as I proposed, especially if a decent number of players join (and it seems like they are), playing two games will take too long.
My suggestion:
1. Team Edition + IRMG (Individual Race Matchmaking Games)
2. Round-robin tournament with groups of 9 people, where each player plays each race once. We can create 2-3 groups. In the playoffs, only standard race selection.