Allderdice held an early lead Friday night against Erie McDowell in the PIAA Class AAAA playoffs, but the Trojans quickly turned the tide to rout the Dragons.
Behind 411 yards and five touchdowns rushing, McDowell defeated Allderdice, 49-19, at Cupples Stadium to advance to a regional final.
Tim Jackson started the scoring, receiving a 37-yard touchdown pass from James Jackson that put Allderdice ahead, 6-0, in the first quarter. But the Dragons missed the extra point and then surrendered five unanswered touchdowns.
In that stretch for McDowell, Jamie Szymczak ran for touchdowns of 5 and 69 yards, and caught a 38-yard touchdown pass from Cameron Spadacene that capped his scoring.
Szymczak finished with 153 yards on 11 carries, but he was not the only McDowell rusher to eclipse the century mark.
Tyree Spearman ran for 119 yards and a 17-yard touchdown on 11 carries for the Trojans.
Because of the Trojans' effective ground attack, McDowell needed just 68 yards passing.
The Trojans also scored when Scot Augustine recovered a fumble in the end zone that put them ahead, 27-0.
Allderdice quarterback James Jackson threw for 240 yards and two touchdowns -- both of which went to Tim Jackson -- and ran for a 12-yard score. But James Jackson also threw three interceptions.
Tim Jackson finished with eight catches for 205 yards.
Allderdice finished with 365 total yards.