List of NHL playoff series

Columns: Opponent | S | Occurrences | GP | Rec | %
Washington Capitals | 5 | 1984 , 1988 , 1989 , 2008 , 2016 | 29 | 2-3 | .400 | New York Islanders | 4 | 1975 , 1980 , 1985 , 1987 | 25 | 3-1 | .750 | Edmonton Oilers | 3 | 1980 , 1985 , 1987 | 15 | 1-2 | .333 | Colorado Avalanche | 2 | 1981 , 1985 | 11 | 2-0 | 1.000 | Dallas Stars | 2 | 1973 , 1980 | 11 | 2-0 | 1.000 | Calgary Flames | 2 | 1974 , 1981 | 11 | 1-1 | .500 | Tampa Bay Lightning | 2 | 1996 , 2004 | 13 | 1-1 | .500

Example questions:
How many playoff seasons in National Hockey League occurred for the opponent against Philadelphia Flyers that was founded in 1974 as an expansion franchise ? | How many playoff seasons in National Hockey League occurred for the opponent against Philadelphia Flyers that was founded in 1926 by Tex Rickard ? | How many playoff seasons in National Hockey League occurred for the opponent against Philadelphia Flyers that has twice advanced to the Stanley Cup Finals ? | How many playoff seasons in National Hockey League occurred for the opponent against Philadelphia Flyers that was founded in 1917 ?

Answers:
5 | 11 | 9 | 6