15 underdogs have won SU since 1983
9 have scored 31 or more
Of the 6 who didn't 5 held their opponent to 17 or less with only the 1990 Giants giving up 19(2 of those were on a safety).
So,underdogs have basically either won scoring 31 or more or holding their opponent to 17 or less.
5 of the 15 have both scored 31 or more and held their opponent to 17 or less.
9 of 15 won by at least a TD.
9 have scored 31 or more
Of the 6 who didn't 5 held their opponent to 17 or less with only the 1990 Giants giving up 19(2 of those were on a safety).
So,underdogs have basically either won scoring 31 or more or holding their opponent to 17 or less.
5 of the 15 have both scored 31 or more and held their opponent to 17 or less.
9 of 15 won by at least a TD.