Alliance Rounds

In different points of the rule book, it states that there will be alliances made of 3 teams with a best 2 out of 3 match (Page 24). At another point it says 2 team alliances will be made (Page 27). What is the correct format for alliance rounds.

It is a 2 team alliance in all matches and in the elimination rounds it is single eliminations. This was changed at worlds and it will continue on I believe.