Controversy in Game 4 after coach's challenge in the first period.

Early coach's challenge in Game 4.

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It was a relatively quiet first period in Game 4 of the Stanley Cup Final, but eventually the Nashville Predators managed to get on the board with just minutes left in the period.

Pittsburgh Penguins head coach Mike Sullivan was however not so convinced that the goal the Predators had recorded was a legitimate one, and after a short delay the Penguins challenged on the basis of goaltender interference. 

From the multiple video angles it did not look like there was a great deal of contact prior to the puck going in the net, and either the officials agreed with that assessment or felt there was not enough video evidence to overturn the call on the ice.