The 1-3-1 power play formation has become the go to power play system for most high level teams. Just about every NHL team is using it so there must be a reason. Power play systems like the overload, umbrella, set pick plays, etc can be effective until the other team knows how to play against them. The 1-3-1 formation allows teams a myriad of options and allows teams to get into other formations very quickly, adding an element of surprise and confusion to the penalty killers.
Full Ice 1-3-1 Ice Hockey System with 1 Defensive Player
Power Play - Half Wall Exchanges
1-3-1 Power Play - 5 Options
WSH 1 3 1 power play mp4
The 411 on the 1-3-1 Power Play - Japers' Rink
NHL Tonight: 1-3-1 power play: Stu Grimson and Brian Lawton on the 1-3-1 power play Jan 31, 2019
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The Not-1-3-1 - by Jack Han - Hockey Tactics Newsletter
Plus–minus - Wikipedia
Why I favor the 1-3-1 Power Play — Special Teams Project
5 on 4 Power Play Ice Hockey Systems Inc.