BOSTON -- The Bruins can’t be accused of feeling sorry for themselves.

After learning in the morning that David Pastrnak, their leader in goals and points, would miss at least two weeks because of a thumb injury sustained in a fall after attending a sponsorship dinner, the B’s put in an outstanding performance on Tuesday evening, beating the Blackhawks, 6-3, at TD Garden in their final home game before a five-game road trip. The Bruins won for the third [...]

BOSTON -- The Bruins can’t be accused of feeling sorry for themselves.

After learning in the morning that David Pastrnak, their leader in goals and points, would miss at least two weeks because of a thumb injury sustained in a fall after attending a sponsorship dinner, the B’s put in an outstanding performance on Tuesday evening, beating the Blackhawks, 6-3, at TD Garden in their final home game before a five-game road trip. The Bruins won for the third straight time, and earned a point for the eighth game in a row (5-0-3)

The line of Brad Marchand, Patrice Bergeron and Danton Heinen scored a pair of even strength goals, and the No. 1 power play got a goal from David Krejci, who sat in for Pastrnak. Heinen also set up Peter Cehlarik, giving the second power-play group a goal. Krjejci added a third-period goal.

Tuukka Rask, despite an at-times leaky performance, made 23 saves and improved to 10-0-2 over this last three decisions

The game started almost as badly as the day had. The Bruins, already challenged enough to score before Pastrnak got hurt, found themselves down by a goal without even giving up a scoring chance: Alex DeBrincat floated a 45-footer on a 1-on-2 rush that Rask, attempting to steer into the corner, instead let break through his blocked and body just 4:22 into the game.

The B’s had to practice some survival techniques to stay in the game. With Marchand about a minute into serving a questionable penalty for interfering with goalie Collin Delia, Zdeno Chara was penalized for roughing after taking out Patrick Kane during a puck battle in the corner. Bergeron and defensemen John Moore and Kevan Miller killed off the bulk of the Blackhawks’ 49-second 5-on-3, and the Blackhawks got nothing going over the balance of Chara’s penalty.

Some of the sting came out of Pastrnak’s absence when the Bruins scored on their first power-play opportunity. Camped in the bottom of the left circle, from where Pastrnak has scored so many of his NHL-high 15 power-play goals, Krejci one-timed Bergeron’s perfect pass home at 1:47 to tie it.

The Marchand-Bergeron-Heinen line then gave the Bruins a two-goal cushion before the period ended.

Heinen scored his ninth of the season just 49 seconds after Krejci scored. Chara one-timed a pass from Bergeron to the front of the net, where Marchand tried to collect and carry it wide of Delia. He lost the handle, but Heinen rapped the loose puck past Delia from 10 feet to give the B’s a 2-1 lead with 4:24 left before intermission.

Marchand started and finished the play that made it 3-1. He won a puck battle in front of the penalty boxes and turned it back towards the offensive zone, where Bergeron got it to Heinen drifting through the left circle. Heinen’s pass across the grain found Marchand coming late into the right circle for an empty-netter with 1:01 to go.

The Bruins didn’t convert a two-man advantage of 1:40 left in the second period, but did score just as Jonathan Toews’ penalty expired, when Krejci put a puck into the crease that Jake DeBrusk tipped in, ending a 13-game gap between goals for DeBrusk. Duncan Keith answered for the Blackhawks 1:31 later, with a slapper that hit DeBrusk’s stick and rose over Rask’s glove with 23 seconds left in the period.