Boston's Brad Marchand scored the tying goal and game-winner for a 3-2 victory over the Philadelphia Flyers on Saturday
Marchand sent it to OT with 14.1 seconds left in regulation and scored the winning goal with 1:08 to play in overtime.
Zdeno Chara had a power-play goal for Boston and goaltender Tuukka Rask made 29 saves, including two excellent stops in OT.
Chris Vandevelde and Jakub Voracek scored for the Flyers, who fell five points behind Boston for the Eastern Conference's final playoff berth.
Steve Mason made 34 saves for Philadelphia.
The Bruins are 4-1-1 in their last six games after losing six straight (0-4-2).