David Pastrnak snapped a tie with 17.2 seconds left and the Boston Bruins beat the Chicago Blackhawks 4-3 on Thursday night for their eighth victory in 10 games.
Pastrnak finished with two goals and an assist. Jack Ahcan scored his first career goal, and Charlie Coyle also scored for the Bruins.
Cassidy wasn't pleased that the Bruins, coming off a 3-2 overtime loss to Los Angeles at home Tuesday night, got pushed to the brink of overtime by the Blackhawks, who aren't going to the playoffs and managed just three shots on goal in the second period. But Brandon Hagel's second goal of the night tied it at 3-all 3:24 into the third and set up a thrilling finish.
Hagel scored twice for Chicago, and Alex DeBrincat extended his streak to five straight games with a goal, giving him 34 for the season.
Patrick Kane got an assist for his eighth point in the last two games for the Blackhawks, who lost for the fourth time in six games and felt they let at least a point, perhaps two, slip away.
Chicago goalie Kevin Lankinen stopped 32 shots, including 18 in the third before a loose puck bounced to Pastrnak in front and he batted it in for his 33rd goal. The play came just after a faceoff, which Chicago won but Boston's Taylor Hall was able to dig a loose puck out of the corner and get it in front to Pastrnak.
Jeremy Swayman had 22 staves for the Bruins.
Boston got a pair of power-play goals in the second while holding Chicago to just three shots on goal in the period. Ahcan, a rookie defenseman playing in just his eighth game, got his first NHL point when he scored a power-play goal on a wrist shot while backing across the slot at 11:57, tying it at 2.
Boston jumped on the short-handed Blackhawks again after Connor Murphy was called for interference 14:31 into the second. Pastrnak scored on a one-timer from the left circle with six seconds left in the power-play opportunity.
Coyle put Boston up 1-0 when a rebound popped right to him at the left circle 4:12 into the game.
DeBrincat tied it at 1 when he fired a one-timer past Swayman off a crossing pass from Kane during a 4-on-1 rush with only Ahcan back for the Bruins.
Hagel then skated in alone on Swayman, circled behind the net and tucked a backhand in the far side to put the Blackhawks in front 4:12 into the second. Hagel picked up his 20th of the season 3:24 into the third when Swayman couldn't contain a rebound and the puck squirted out to Hagel alone in front of the crease during Chicago's third power play of the game.