Geekie tied the game 1-1 at 12:17, following his own shot from the slot after it slid through Mrazek’s pads and tapping it in at the top of the crease.
Marchand put the Bruins ahead 2-1 at 2:58 of the second period with a one-timer from the right circle off a cross-ice pass from Pastrnak.
Marchand scored again to make it 3-1 at 5:03, lifting a backhand from below the right circle past Mrazek after a shot by Pastrnak.
Jason Dickinson brought the Blackhawks within 3-2 with a turnaround shot from the left circle at 18:23. The puck deflected into the net off Bruins defensemen Brandon Carlo and Nikita Zadorov.
“We’re not happy with the record, for sure,” Blackhawks coach Luke Richardson said. “The guys are trying to work within the system the right way and unfortunately, like I said before, we don’t seem to have one Achilles heel. There’s not one problem with our team. It’s like one night there’s one area, maybe our defense or our forwards or one player, and then the next night it’s another area by a different player. So, it’s just an accumulation of one-offs every game that put us behind the 8-ball.”
Geekie’s breakaway goal at 5:02 of the third period put the Bruins up 4-2. Brazeau sprung Geekie, who skated in and scored on a wrist shot.
“It was good,” Geekie said. “He (Brazeau) made a nice play. He found me twice today. You see him make plays like that all the time, so it's no surprise to anyone. I just try to get to the right spot for him and he made a great play.
"I was trying to kind of hide. ‘March’ made another good change and I was trying to hide behind the second D. I honestly didn't say much. I saw him get the puck and tried to take off. Normally that's your first look when you're kind of outnumbered in the zone."
