BOSTON -- Boston University didn't have a complete roster. But Union College didn't put together a complete effort.

With seven Terriers up north playing in the World Junior Championships in Montreal for Team USA and Team Canada, Boston University got a hat trick from Jakob Forsbacka Karlsson, including the game-winner 2:51 into overtime, for a 5-4 non-conference victory at Agganis Arena on Thursday night.

The fifth-ranked Terriers (11-5-2) got off to a quick start, then took advantage of two late penalties in the third period to tie the game 4-4 on the power play with 2:54 left on Forsbacka Karlsson's second goal of the game and fifth of the season.

That goal came after the 10th-ranked Dutchmen (14-5-2) were whistled for too many men on the ice with five seconds remaining in a hooking penalty to Spencer Foo.

"Their coaching staff had them ready to go," Union head coach Rick Bennett said. "I think it's a 'Coaching 101.' I obviously didn't have our guys ready to go well enough for the start of the game, and the first 10 minutes might have cost us. We made some mental mistakes that really cost us there at the end."

Foo kept his point streak -- now at 19 games -- alive when he assisted on Sebastian Vidmar's ninth goal of the season that broke a 2-2 tie 7:54 into the second period.

The Terriers had jumped out to a 2-0 lead 8:51 into the game on goals by Shane Switzer and Forsbacka Karlsson, but the Dutchmen got back into it with goals by Luc Brown, his third of the season, and Cole Maier.

After BU's Bobo Carpenter answered Vidmar's goal to tie it unassisted midway through the second, Union regained the lead 4-3 on Brett Supinski's power-play goal assisted by Vidmar and Mike Vecchione with 4:08 left in the second.

It stayed that way for over the next 20 minutes of game action before Union committed the late penalties and Forsbacka Karlsson was able to send it into overtime.

"It's a good learning curve for us," Bennett said. "In the last two games, we've really seen that you have to play a full 60 minutes if you want to compete with the top teams."

Union was coming off a 3-1 loss to defending national champion North Dakota on Saturday at Messa Rink.

This article is from The Daily Gazette, Schenectady, N.Y. and was legally licensed via the Tribune Content Agency through the NewsCred publisher network.