Brandon Saad, Dave Bolland and Johnny Oduya scored for the Blackhawks in regulation play at United Center in Chicago. The winning goal came 52 minutes, eight seconds into overtime as Michal Rozsival’s shot was deflected first by Bolland and then by Andrew Shaw into the net.
Game 2 in the best-of-seven series is scheduled for the same venue on June 15.
The series pits the 2010 champion against the following year’s Stanley Cup recipient. The Blackhawks ended a 49-year wait for a fourth NHL title three years ago and the Bruins snapped a 39-year gap between titles when they claimed a sixth championship in 2011.
The longest game in Stanley Cup Final history also featured the Bruins, who lost 3-2 to the Edmonton Oilers in Game 1 of the 1990 edition to a goal after 55:13 of overtime.
Milan Lucic got the first goal after 13 minutes, 11 seconds and added a second for Boston 51 seconds into the second period.
After Saad got one back for the Blackhawks 2:17 later, the Bruins moved 3-1 ahead as Patrice Bergeron scored on a power play 6:09 into the third period.
Bolland got a goal for the Blackhawks less than two minutes later and Oduya tied it with 7:46 to play in the third.
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