The Bruins' final push was a stark contrast to the beginning of the game, with the Blackhawks looking refreshed during a dominant first period. The Bruins looked tired and slow, except for Rask, and he was enough to keep it close.
Rask turned away numerous prime opportunities for Chicago, but Sharp managed to score while the goaltender contended with a pile of bodies in front of the net. It was his ninth playoff goal, breaking a tie with Bryan Bickell for the team lead and matching Boston center David Krejci for the NHL's best total.
A few minutes later, Marian Hossa pushed Rask's pads and the puck just over the red line in goal. But the officials ruled the play had been whistled dead before the score.
"I thought the whistle was a little quick, but that's the way it is," Blackhawks captain Jonathan Toews said. "It's frustrating when the bounces don't go your way, but it is what it is."
When the first period was over, the Blackhawks had 19 shots on goal. Sharp (six) and Hossa (five) each had more shots than Boston had as a team (four).
It was not a pretty scene in the Bruins' locker room at intermission — Julien said there was "a bit of a chat." Still, Chicago only had a 1-0 lead.
"I think we were angry," Seguin said. "We were motivated. I think the guys just weren't happy in here. We knew we could be better. We were making mental mistakes."
Boston began to control the action in the second, leading to the tying score.
Paille had a takeaway against Sharp behind the net and then made a nice move to get to the other side of the goal. Crawford turned him away, but Kelly was there to poke in the rebound at 14:58.
Kelly's first playoff goal since April 12, 2012, against Washington and No. 11 for his career ended Boston's scoreless stretch of 1 hour, 40 minutes and 57 seconds dating to the third period of the opener.
"It's like the second period, I thought we lost the pace of the game on that end of the rink," Blackhawks coach Joel Quenneville said. "We had the perfect start to the game, then we stopped doing what made us successful. We stood around. They countered."
NOTES: Bruins F Nathan Horton played 21½ minutes after leaving the series opener with an unspecified upper body injury. ... Toews received a standing ovation when he was recognized in the first period with a videoboard message honoring the center for winning this year's Frank J. Selke award, given to the NHL's best defensive forward. ... It was the first split of the first two games of the Stanley Cup finals since 2004, when Calgary won the first game on the road and Tampa Bay took Game 2. The Lightning won the series in seven games.