Corey Crawford made 33 saves for the Blackhawks.
Game 4 is Wednesday night in Boston before the matchup of Original Six franchises returns to Chicago for a fifth game. The teams split the first two games there, with the Blackhawks winning Game 1 in triple overtime and the Bruins stealing home-ice advantage on Paille's goal in the first OT of the second game.
But this time the intrigue came before the opening faceoff instead of after the end of regulation.
Bruins defenseman Zdeno Chara and Chicago forward Marian Hossa both left the ice after warm-ups. But while Chara needed just some stitches after his collision with teammate Milan Lucic, Hossa was a late scratch with an unspecified injury.
"I was as surprised as anybody else," Bruins coach Claude Julien said. "I can definitely tell you they lost a pretty important player on their roster, but that doesn't mean we change our game. I think it's important we stick with what we believe in."
Julien said Chara slipped and "had a little gash over his eye."
"Nothing serious," Julien said of his captain and No. 1 defenseman, who still managed to lead the team in ice time.
Blackhawks coach Joel Quenneville was less forthcoming with information on Hossa's malady, sticking to the standard NHL diagnosis: upper body.
"We'll say 'day-to-day.' We're hopeful he'll be ready for the next game," he said, adding that it did not happen during warm-ups, as had been reported on the team's Twitter account. "It was a game-time decision after the warmup there. That's when we made the call, after warm-up."
Hossa, who has three game-winning goals in the playoffs this year, was tied for the team lead with 15 playoff points and was third on the Blackhawks with 17 goals during the regular season.
It was a loss the Blackhawks couldn't afford.
Not with Rask stopping everything that came his way.
"We ran up against some of the best goalies in the league here," Quenneville said. "Tonight I thought we made it rather easy on him as far as traffic and finding and seeing pucks. I think we've got to be better at going to the net."
Rask, who was a backup to Conn Smythe-winner Tim Thomas in the team's 2011 Stanley Cup run, didn't face as difficult a test as in the first period of Game 2, when the Blackhawks sent 19 shots at him but managed just one goal. But he stymied them all game and got some help from the post on Bryan Bickell's shot with 42 seconds left in the game.
The puck caromed off the right post and the goal light flickered on briefly, but officials ruled it was not a score.
P All games at 6 p.m.
Game 1 • Chicago 4, Boston 3 (3OT)
Game 2 • Boston 2Chicago 1 (OT)
Game 3 • Boston 2, Chicago 0
Bruins lead series 2-1
Game 4 • Wednesday, at Boston, Ch. 5
Game 5 • Saturday, at Chicago, Ch. 5
x-Game 6 • June 24, at Boston, Ch. 5
x-Game 7 • June 26, at Chicago, Ch. 5