Review the final bracket, Swiss standings, and match history.
Standings
MBuch is Median-Buchholz: the sum of a player's opponents' wins, less their single best and single worst opponent. Under three opponents there is nothing left after dropping both ends, so it reads as the plain sum instead.
Tiebreak Order
Wins is always the first tiebreaker.
Wins
Points Difference
Points Scored
Head-to-Head
Median-Buchholz
Seed