Nhl

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Boston Bruins goalie Tuukka Rask (40) of Finland stops a shot by Detroit Red Wings center Darren Helm (43) during the second period of Game 4 of a first-round NHL hockey playoff series in Detroit, Thursday, April 24, 2014. (AP Photo/Carlos Osorio)

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Boston Bruins defenseman Kevan Miller (86) takes down Detroit Red Wings left wing Justin Abdelkader (8) and is called for roughing during the second period of Game 4 of a first-round NHL hockey playoff series in Detroit, Thursday, April 24, 2014. (AP Photo/Carlos Osorio)

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Boston Bruins defenseman Torey Krug celebrates his goal with teammates during the second period of Game 4 of a first-round NHL hockey playoff series against the Detroit Red Wings in Detroit, Thursday, April 24, 2014. (AP Photo/Carlos Osorio)

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Boston Bruins goalie Tuukka Rask (40) prepares to stop the shot by Detroit Red Wings left wing Tomas Tatar (21) during the second period of Game 4 of a first-round NHL hockey playoff series in Detroit, Thursday, April 24, 2014. (AP Photo/Carlos Osorio)

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Boston Bruins, clockwise from foreground left, Torey Krug (47), Patrice Bergeron, Justin Florek, Reilly Smith and Kevan Miller (86) celebrate Krug's goal during the second period of Game 4 of a first-round NHL hockey playoff series against the Detroit Red Wings in Detroit, Thursday, April 24, 2014. (AP Photo/Carlos Osorio)

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Boston Bruins right wing Reilly Smith (18) controls the puck ahead of Detroit Red Wings defenseman Brendan Smith during the first period of Game 4 of a first-round NHL hockey playoff series in Detroit, Thursday, April 24, 2014. (AP Photo/Carlos Osorio)

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Detroit Red Wings defenseman Niklas Kronwall (55)checks Boston Bruins center Carl Soderberg (34) during the first period of Game 4 of a first-round NHL hockey playoff series in Detroit, Thursday, April 24, 2014. (AP Photo/Carlos Osorio)

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Detroit Red Wings defenseman Niklas Kronwall (55) is congratulated by teammates after his goal during the first period of Game 4 of a first-round NHL hockey playoff series against the Boston Bruins in Detroit, Thursday, April 24, 2014. (AP Photo/Carlos Osorio)

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Detroit Red Wings defenseman Kyle Quincey (27) checks Boston Bruins right wing Reilly Smith during the first period of Game 4 of a first-round NHL hockey playoff series in Detroit, Thursday, April 24, 2014. (AP Photo/Carlos Osorio)