The Bruins broke the ice, just as they have in all three games of this series, but the pesky Islanders hung around to force OT an unsuccessful comeback attempt.
In overtime, Long Beach-born Charlie McAvoy made the zone entry for Boston and found a streaking Marchand along the left wall. Marchand took a few strides and beat Varlamov far side as he fired off his shot on a tough angle.
"It was a weird shot," Varlamov said. "But the puck found the net, so it was a good play I guess by Marchand."
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Barzal Ties It Late
Much of regulation featured the type of style of play that's to be expected from both teams with heavy, hard-hitting, tight-checking hockey with limited opportunities for offense. The Bruins outshot the Islanders 39-24, including by 21-9 in just the third period.
"[The games] are really tight," Barzal said. "Two of the top teams in the league just playing hard. A lot of power plays tonight, it was an exciting game. Our group battled hard and so did they. It's been like that the last three games and I don't think it's going to change. Just two good teams going at it and a matter of inches every game is so close."
Despite a strong start from the Islanders, who were playing with some jump out of the gate, Boston capitalized at 5:52 on a play that started in their own zone.
After stripping Barzal of the puck at the blueline in Boston's zone, Taylor Hall jetted up ice and curled his path to the right faceoff circle. He collected a pass from Matt Grzelcyk and snapped a feed onto Smith's tape in the high slot. Smith wired his shot over Varlamov's glove to give Boston a 1-0 lead that remained heading into the first intermission.
The Islanders had chances to even it up in the first period; with a Beauvillier breakaway two minutes after Smith's icebreaker, and a power play - on Brad Marchand's high-sticking penalty at 11:08 - but couldn't break through.
The second period was relatively uneventful as it remained 1-0 in favor of the Bruins. The Islanders received their second power play of the night at 8:12 on David Pastrnak's slash on Ryan Pulock, but were unsuccessful in capitalizing.
In the final period of regulation, Boston dictated the tempo and controlled the majority of possession. Boston was down to five defensemen after Brandon Carlo left the game 6:11 into the third period after receiving a hit from Cal Clutterbuck behind the Bruins' net.
Despite being outplayed for the majority of the third period, the Islanders hung on and in true 'Islander hockey' fashion, the team stayed patient and pounced on their golden opportunity.