NHL power plays: Who's doing it right, who needs major help

Goals are hard to come by in hockey, particularly at even strength, when there isn't much open real estate on the ice. At five-on-five this season, the league average for goals scored per hour of play is 2.5, and just 4.5% of all shot attempts toward the net actually wind up in the back of the net. On the power play, those rates go up to 6.8 goals per hour, and 7.2% of shot attempts that result in goals. That increased likelihood of scoring may not seem like much, but it's actually quite huge given the razor-thin margin between winning and losing.

A coach has many different job requirements, but one of the main responsibilities is to put players in a position to succeed on the ice. That can…