The Bruins would answer as Sean Kuraly skated out from behind the Blackhawks net and fired a shot from the bottom of the circle that deflected between Robin Lehner's pads and into the goal at 12:49 of the second.
For the second straight game, 60 minutes would not be enough, despite a late would-be go-ahead tally from Drake Caggiula that was called back when the referees deemed the puck to be played with a hand pass.
In overtime, Charlie McAvoy scored the winner off the rush, sealing a 2-1 win for the Bruins.