Co-captain goaltender Laura Bellamy turned away 30 shots for her tenth win of the season. On the other side of the rink, MacDonald stood tall in net for St. Lawrence, making 43 saves during regulation.

“We certainly were struggling to put it past [MacDonald],” Fry said. “At the same time, [the Saints’ defenders] were not letting us get to the net and crash her.”

The Crimson pressured MacDonald throughout the game but particularly in the third period, outshooting St. Lawrence, 19-10, in the final frame of regulation. Armstrong’s game winner was Harvard’s first shot on goal in overtime.

Less than a year ago, the Saints ended the Crimson’s season, upsetting Harvard in the ECAC semifinals with a 2-1 overtime win. On Saturday, the loss provided extra motivation for the Crimson.

“We hit a point where there was no way we were losing that game, especially with [St. Lawrence’s] ending our season last year,” Fry said. “We didn’t go up there for two losses, absolutely not.”

After the .500 weekend, Harvard retained first place in the ECAC. The Crimson sits four points ahead of Cornell and Clarkson, who both have played one fewer game than Harvard. Seven conference games remain on the Crimson’s regular season schedule.

—Staff writer Michael D. Ledecky can be reached at mledecky@college.harvard.edu.