According to Section 30 of the UDE Official Tournament Policy:
30. Number of Rounds and Single-Elimination Cut
The number of Swiss rounds in a tournament and the cut for single-elimination rounds is determined by the total number of players enrolled in the tournament. Single game matches use a different table than three game matches to determine the total number of rounds, as well as the cut for single-elimination rounds. Tournament organizers may slightly adjust the number of rounds, but only if they clearly announce this prior to the start of the tournament.
Three game match rounds and cut One game match rounds and cut
4-8 – 3 rounds (Top 2) 4-8 – 4 rounds (Top 2)
9-16 – 4 rounds (Top 4) 9-16 – 5 rounds (Top 4)
17-32 – 5 rounds (Top 8) 17-22 – 6 rounds (Top 8)
33-64 – 6 rounds (Top 8) 23-36 – 7 rounds (Top 8)
65-128 – 7 rounds (Top 8) 37-52 – 8 rounds (Top 8)
129-256 – 8 rounds (Top 8) 53-94 – 9 rounds (Top 8)
257-512 – 9 rounds (Top 8) 95-152 – 10 rounds (Top 8)
513-1024 – 10 rounds (Top 8) 153-256 – 11 rounds (Top 8)
1024+ – 11 rounds (Top 8) 257-440 – 12 rounds (Top 8)
441+ – 13 rounds (Top 8)
Miki Urban
Upper Deck Digital