In other games, Minnesota Wild clinch first play-off win in five years and Ottawa Senators complete a rout.
NHL play-offs: Power-play goal from Chris Kunitz winner for Pittsburgh Penguins
Chris Kunitz scored his second power-play goal of the contest at 8:44 of overtime as visiting Pittsburgh won Game 3 of their NHL Eastern Conference first-round series to seize a 2-1 edge against eighth-seeded New York Islanders.
After Sidney Crosby drew a holding penalty on former Penguin defenseman Brian Strait, the Penguins captain fed Kunitz from along the end line on the winning tally. Kunitz made no mistake in the slot by sailing a shot over the glove of Evgeni Nabokov (20 saves) to end the wild affair.
Jarome Iginla converted on a 5-on-3 power play, Kunitz scored 19 seconds later and Pascal Dupuis capped top-seeded Pittsburgh's three-goal first period by tallying for the third time in the series.
Defenceman Douglas Murray also scored and Marc-Andre Fleury turned aside 32 shots for the Penguins, who will look to push the host Islanders to the brink of elimination in Game 4 on Tuesday.
Kyle Okposo scored for the second straight contest and John Tavares tied the score at 4-4 midway through the third period by using Penguins defenceman Mark Eaton as a screen prior to his wrist shot from the right circle.
Matt Moulson and Casey Cizikas staked New York to an early 2-0 lead in the first period.
With the contest tied at 2-2, Crosby skated up the right wing before his backhanded centering feed was tapped home by Dupuis, who had inside position on Tavares.
Murray doubled the advantage after settling Evgeni Malkin's centering pass in the left circle before wiring a shot inside the right post.
Minnesota Wild 3, Chicago Blackhawks 2
Minnesota recorded their first play-off victory in five years on Sunday when rookie Jason Zucker scored from a sharp angle 2:15 into overtime to give the hosts a 3-2 win over the Blackhawks.
Pierre-Marc Bouchard scored late in the first period and set up Zucker's winner from along the goal line while Zach Parise also tallied for the eighth-seeded Wild, who trail their Western Conference first-round series 2-1.
Josh Harding made 25 saves for his first career play-off victory for Minnesota, who host Game 4 on Tuesday.
Defencemen Johnny Oduya and Duncan Keith provided the offence for the top-seeded Blackhawks, who lost to the Wild outside of a shoot-out for the first time in 12 contests. Corey Crawford stopped 34 shots.
Ottawa Senators 6, Montreal Canadiens 1
Rookie Jean-Gabriel Pageau notched his first hat-trick and hosts Ottawa broke Game 3 open with two goals in an eight-second span of the third period to take a 2-1 lead in the Eastern Conference first-round series.
Captain Daniel Alfredsson had a goal and two assists and Craig Anderson turned aside 33 shots as the seventh-seeded Senators took control over the final two periods of a slugfest that featured 232 minutes in penalties.
Game 4 of the best-of-seven series will be played on Tuesday in Ottawa.
Kyle Turris and Jakob Silfverberg scored eight seconds apart in the third to turn it into a rout, with their goals sandwiching a flurry of fisticuffs that featured 10 fighting majors. Rene Bourque scored the lone goal for second-seeded Montreal while netminder Carey Price made 24 saves.
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