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NHL Public Relations on Twitter: "@NHL New this season, all unsuccessful Coach's Challenges will result in a penalty. Teams may initiate a challenge on appropriate plays at any time except the final
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NHL playoff scores 2016: Offside coaches challenge a broken rule after controversial weekend - SBNation.com
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Think Twice, NHL Coaches: There's a New Rule to Curb Your Offsides Challenge Trigger Finger | 1st Ohio Battery
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