Alfredsson finished the scoring with a late power-play goal for his 100th career playoff point.
The Penguins won Sunday on a power-play goal in overtime after a questionable Islanders' penalty.
Streit put New York back in front from the left point with a long-awaited power-play goal.
New York even scored a power-play goal and added another tally just as another advantage ended.
The Rangers grabbed the lead back with Brassard's power-play goal 1:23 into the second.
Daniel Ciampini completed the rout with a power-play goal at 5:19 of the third period.
Foligno's power-play goal with 8:27 to go in the third broke a 3-3 tie.
Visnovsky put the Islanders ahead 3-1 with a power-play goal at 11:46 of the second.
Patrick Wiercioch made it 2-0 at 10:50 with a power-play goal that also bounced in.
The Bruins have 24 consecutive penalty kills since allowing a power-play goal in Montreal on Feb. 6.
Tampa Bay hasn't scored a power-play goal in three games after connecting eight times on 16 chances.
Moulson brought the Islanders within 5-4 by netting his second power-play goal of the game with 8:28 left.
Moulson's power-play goal, his 15th, at 15:03 tied it before Tavares gave New York a 3-2 lead at 17:24.
After blowing a two-goal lead, Greene's power-play goal put the Devils up 3-2 with 6:02 left in the second.
Washington had scored a power-play goal in each of its previous six games, connecting on 8 of 15 opportunities.
That made the Bruins the last team to allow a power-play goal this season after 23 successful penalty kills.
Taylor Pyatt scored a power-play goal for the Rangers earlier in the third.
Girardi made it 1-0 on a power-play goal with 9:21 left in first, one-timing a pass from Mats Zucarello into the net.
The Capitals pulled even in the second period when Joel Ward scored a power-play goal after a needless slashing penalty by Boyle.
Giroux made Buffalo pay when he scored only 17 seconds into the third for Philadelphia's second power-play goal and a 3-1 lead.
The Hurricanes also started the second period strongly, and this time they were rewarded as Jokinen got a power-play goal at 1:36.
Fleischmann's power-play goal 43 seconds into the second period made it 2-0.
Bickell scored a power-play goal on a rebound in front, and Handzus skated in and beat Quick to make it 4-0 at 9:20.
But the trio has yet to score a power-play goal in a combined 96 minutes of time on ice with an extra man.
The Devils had already been called for two unsportsmanlike conduct penalties, one that cost them a power-play goal, before DeBoer was ushered out.
Cole Ikkala put a soft goal past goalie Parker Milner, and Shayne Gostisbehere added a power-play goal to cap the three-goal second period.
Louis extended the lead to 2-0 at 8:15 of the second period with a power-play goal off a sharp pass from Teddy Purcell.
Huberdeau tied the score at 4-all when he pushed the puck past Miller for a power-play goal with 6:09 remaining in the third period.
Neal started the third-period flurry with a power-play goal at 1:59.
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