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After two Boston blowouts, the Penguins matched the Bruins and even outshot them 39-25 in regulation — including a third period in which Pittsburgh held a 14-4 advantage despite two Boston power plays. The Bruins didn’t muster a shot in the final 7½ minutes of regulation.

But they had the better chances in overtime, including Nathan Horton’s breakaway that Vokoun turned aside just 2:21 in, and another shot by Horton that went off the right post with 12:25 on the clock.

Pittsburgh forced Rask to make a save with 5 minutes left in the first OT, when Craig Adams tried to poke home a rebound.

“I think the whole game we felt really comfortable with our play,” said Penguins captain Sidney Crosby, who has yet to record a goal or assist in the series. “I think we felt like it was just a matter of time before we were going to get it. Unfortunately, they … hung around and got one at the end.”

The Bruins opened the scoring when Krejci circled around the net and took a slap shot that caromed in off Pittsburgh defenseman Matt Niskanen. But the Penguins tied it in the second — the first time in the series, other than 0-0, that they have been even — when Kunitz one-timed a pass from defenseman Paul Martin over Rask’s right shoulder.

Pittsburgh went 0 for 6 on power plays — including two in overtime. Boston was 0 for 5.