BOSTON - Give the Penguins credit - they fought until the very end of regulation.
The Penguins tied the Bruins up at 3-3 on a Sidney Crosby goal with 0.3 seconds left on the clock in the third period.
But it was Torey Krug who scored just 34 seconds into overtime, and the Bruins escaped with two points after all that.
Bruins goaltender Tuukka Rask and the Boston defense frustrated the high-powered Penguins attack in the first period - but the Penguins would not go down quietly.
Pittsburgh got one back in the second period when the third line botched some D-zone coverage, and both Chris Kelly and Carl Soderberg rushed to Evgeni Malkin with the puck along the side boards.
That freed up Jussi Jokinen to find James Neal in the slot, and the Penguins forward snapped a wrist shot past Rask to the top corner on his stick-side to cut the lead in half.
It was Neal again who scored the tying goal 11:09 into the third period.
Zdeno Chara's slapshot 14:45 into the third period was tipped in by Crosby, making it 3-2 Bruins.
But Crosby wasn't done, sending the game into OT before Krug finished things off for good, blasting a Brad Marchand pass right past Marc-Andre Fleury.
It was the Swedish connection that kicked things off for the B's as Carl Soderberg and Loui Eriksson factored into the first two goals with a Reilly Smith power play strike at the doorstep just eight seconds into the man advantage.
Eriksson led the Bruins with five shots on net, and made a silky smooth play between his legs before beating Fleury five hole with a backhander on a partial breakaway.
With the victory, the Bruins extend their lead as the Eastern Conference’s top dog to four points as they get ready for another divisional showdown on the road with the Red Wings on Wednesday night.