CHICAGO - Andrew Shaw skated off to the side and pumped his arms furiously.
One shot from the right point plus two deflections was just enough to beat Tuukka Rask in the fifth-longest Stanley Cup finals game in history.
Shaw skated in front of the goal in the third overtime and redirected Dave Bolland's shot into the net for the winning score in the Chicago Blackhawks' 4-3 victory over the Boston Bruins in a riveting Game 1 on Wednesday night.
Michal Rozsival started the winning sequence with a shot from the right point into traffic. Bolland tipped it before Shaw got it past Rask for his fifth goal of the playoffs, ending the longest Stanley Cup finals game in five years.
"We knew it wasn't going to be pretty," Shaw said. "It was a great shot, great shift. It was unbelievable. All the guys deserved this. It was a great battle for us."
Milan Lucic had two goals and an assist for the Bruins, who had won five straight and nine of 10. Patrice Bergeron scored a power-play goal, and David Krejci finished with two assists.
Rask made an astounding 59 saves in the longest finals game since Pittsburgh beat Detroit 4-3 when Petr Sykora scored at 9:57 of third overtime on June 2, 2008.
The Blackhawks won for the eighth time in nine games and improved to 10-1 at home in the playoffs.
Game 2 is Saturday night at the United Center.
"Get some rest, because we basically just played two games in one night here," Blackhawks coach Joel Quenneville said. "But based on how it went tonight, we'll have to be ready."
Jaromir Jagr nearly won it for Boston in the closing seconds of the second OT when the puck deflected off him and hit the post, preserving the tie.
The Bruins were on a power play after Chicago got called for too many men on the ice with 52.8 seconds left in the second OT.
Zdeno Chara's shot from the right point hit Jagr in the slot and deflected off the right post, then bounded through the crease in the waning seconds.
With Original Six franchises playing for a championship for the first time in 34 years, the series is off to a rousing start.
The Blackhawks got third-period goals from Dave Bolland and Johnny Oduya to erase a 3-1 deficit. Corey Crawford was simply spectacular in the first extra period, and the Blackhawks wound up going to double-OT for the second straight game after taking out the Los Angeles Kings in the Western Conference finals.
Crawford made a sprawled-out pad save on Shawn Thornton about four minutes into the first OT, and he stood his ground in a flurry with just under eight minutes remaining, stopping Rich Peverley and Tyler Seguin on the rebound to draw oohs and ahhs from the crowd.
In the second overtime, Patrick Kane had a chance to win it. But he fired wide left off the end of his blade from the edge of the crease seven minutes into the period.
Chicago's Michael Frolik just missed high and wide with 6:30 remaining, and Shaw's stuff-in attempt with 3:51 left got stuffed by Rask.
The Bruins appeared to be in good shape building a 3-1 lead in regulation, with Milan Lucic scoring twice and Patrice Bergeron adding a power-play goal just over six minutes into the third.
• What: Bruins at Blackhawks; Blackhawks lead series 1-0
• When: 5 p.m. Saturday
• TV: NBCS