BOSTON - Spencer Abbott scored the go-ahead goal on a power play in the second period to help Maine defeat Boston University 6-3 in the second game of a Hockey East quarterfinal.

Maine tied the quarterfinal at 1-1 and ended BU's 17-game unbeaten streak, handing the Terriers, the No. 1 team in the country, their first loss since Jan. 13.

Gustav Nyquist scored two goals for the Black Bears (13-21-4), who trailed 3-1 halfway through the first before tying the game on Keif Orsini's goal at 12:38.

Scott Darling made 29 saves for Maine while goalie Kieran Millan made 20 for BU (28-6-4).

The best-of-three series concludes at 7 p.m. Sunday at Agganis Arena.

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1 for 10.

That's how productive BU's power play has been in two games. Entering this weekend's series the Terriers had the No. 1 power play in the country at 24.3 percent.

Meanwhile, Maine's power play has gone 5 for 10 in two games, including Saturday's 4-for-7 effort.

"It's just the playoffs," said Gustav Nyquist, who scored a power-play goal in the win. "I think we've had a good power play all year. We just couldn't get the puck in the net."

After Saturday, Notre Dame became the nation's top man-advantage team, according to CollegeHockeyStats.net, with a 23.7 percent conversion rate. BU is second (23.3 percent) entering Sunday's game.

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When it seemed as if Chris Hahn was carrying Maine's second line, centering Robby Dee and Kevin Swallow, Dee and Swallow became contributors in the win at BU. Swallow was part of Maine's offense on the ice when Keif Orsini scored the game-tying goal on a shot that bounced off Terriers goalie Kieran Millan and Dee scored a power-play tally at 11:04 of the third.

"We haven't gotten a lot of scoring outside of that first line (Tanner House, Brian Flynn and Gustav Nyquist) all year so it's nice for some other guys to step up, for Robby to step up and get that goal tonight and it helps the team out a lot," Swallow said. "Six goals is huge."

Dee, Hahn and Swallow combined for five points - a goal and an assist each for Hahn Dee and an assist for Swallow

Hahn is Maine's fourth-leading scorer with six goals and eleven assists but had been scoreless in six games entering Saturday.

Swallow, meanwhile, hasn't scored a goal since Nov. 14 and was originally credited with Orsini's goal. After the game, the goal was credited to Orsini and an assist to Swallow.

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Here's how BU's scoring sequence left, between Chris Hahn's goal and Gustav Nyquist's goal:

Hahn's goal 42 seconds into the game gave Maine a 1-0 lead, but the Terriers capitalized on a pair of defensive miscues by the Black Bears in the next four minutes to take a 2-1 lead on goals by Brandon Yip and Luke Popko.

Yip picked up the puck in front of the goal as Maine goalie Scott Darling attempted to poke it away with his stick and tucked the puck between Darling's pads to tie the game at 1-1 at 3:40, and Popko picked up Josh Van Dyk's pass, intended to go behind the net to Duffy, and beat Darling at 5:23.

John McCarthy gave BU a 3-1 lead on a shorthanded goal at 11:41 and it appeared that BU was in control.

But 26 seconds later, Nyquist cut the lead to 3-2, roofing a backhand past Kieran Millan, and Orsini tied the game at 12:38.

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