Patrice Bergeron scored 15:19 into the second overtime to lead the Boston Bruins to a 2-1 victory over the Pittsburgh Penguins and a 3-0 series lead in the Eastern Conference finals on Wednesday night.
The victory put Boston in control of the best-of-seven series and a chance to advance to the Stanley Cup finals in Game 4 on Friday night at home.
Tuukka Rask stopped 53 shots for the Bruins.
Tomas Vokoun made 38 saves for the Penguins one game after he was yanked from the net after giving up three quick goals in the first period.
David Krejci also scored for Boston.
Chris Kunitz scored Pittsburgh's only goal.