Ottawa right-winger Mark Stone scored twice and goal-tender Andrew Hammond stopped 34 shots as the Senators beat the Philadelphia Flyers 3-1 and clinched a spot in the Eastern Conference playoffs.
NY Rangers V Pittsburgh Penguins
Washington Capitals V NY Islanders
Montreal Canadiens V Ottawa Senators
Tampa Bay Lightning V Detroit Red Wings
Anaheim Ducks V Winnipeg Jets
Vancouver Canucks V Calgary Flames
St Louis Blues V Minnesota Wild
Nashville Predators V Chicago Blackhawks
Centre Jean-Gabriel Pageau added a goal as Ottawa completed their improbable run to the playoffs, clinching a spot on the season's final day.
Elsewhere, Centre Brandon Sutter scored twice as Pittsburgh qualified for the post-season for the ninth consecutive year with a 2-0 win over the Sabres.
Penguins goalie Marc-Andre Fleury made 28 saves for his 10th shutout of the season.
Centre David Desharnais scored the decisive goal in a shootout as the Canadiens clinched first place in the Atlantic Division following a 4-3 win over the Maple Leafs.
The Canadiens entered the game needing only one point or a loss by the Tampa Bay Lightning to secure the division title.
Lightning 3, Bruins 2 (SO)
Ducks 2, Coyotes 1
Blue Jackets 5, Islanders 4 (SO)
Rangers 4, Capitals 2
Blues 4, Wild 2
Jets 5, Flames 1
Kings 4, Sharks 1
Red Wings 2, Hurricanes 0
Panthers 3, Devils 2
Stars 4, Predators 1
Avalanche 3, Blackhawks 2
Canucks 6, Oilers 5 (OT)