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1). There is another option for the future: award 3 points for a win and 1 point for a draw, like in soccer. This would encourage players to play more aggressively for the win.
upd* The beat me to it!
2). A more radical approach: No collusion! A draw in Heroes can only result from a stalemate, for example, when one player has a lot of resources and the other has control, and it's impossible to catch up. Everything else is a manipulation of the results! And experienced players will immediately understand everything from the save files. In general, the Tournament Committee should already decide on this issue, as well as on the old question: what should be considered blocking.

