There is no MMR cap for this tournament. You must be on your main account. Participants must play the same hero vs each other in a best of 1 match per round. This hero will be randomly chosen for each match by spinning a wheel on-stream. This wheel will randomly choose a Dota2 hero. This will happen for all matches.
Once we reach the semi-finals and finals (final 4 players) we will do a best of 3 matches per round. The hero will be chosen using the same process of spinning a wheel on-stream. This will randomly choose a Dota2 hero. This will conclude the round. US East servers will be used by default unless both parties agree to change servers together.
Here is a link to the official rules in more detail:
https://docs.google.com/document/d/1xch2uygbLdQ8F0ZROkihWlHsZdA3PJgnUs8dhyj-wRw/