List of NHL playoff series

Columns: Opponent | S | Occurrences | GP | Rec | %
Washington Capitals | 11 | 1991 , 1992 , 1994 , 1995 , 1996 , 2000 , 2001 , 2009 , 2016 , 2017 , 2018 | 68 | 9-2 | .818 | New York Rangers | 7 | 1989 , 1992 , 1996 , 2008 , 2014 , 2015 , 2016 | 37 | 5-2 | .714 | Philadelphia Flyers | 7 | 1989 , 1997 , 2000 , 2008 , 2009 , 2012 , 2018 | 41 | 3-4 | .429 | Ottawa Senators | 5 | 2007 , 2008 , 2010 , 2013 , 2017 | 27 | 4-1 | .800 | New Jersey Devils | 5 | 1991 , 1993 , 1995 , 1999 , 2001 | 29 | 3-2 | .600 | Boston Bruins | 5 | 1979 , 1980 , 1991 , 1992 , 2013 | 23 | 2-3 | .400 | New York Islanders | 5 | 1975 , 1982 , 1993 , 2013 , 2019 | 29 | 1-4 | .200

Example questions:
In what year was the NHL team with the most playoff appearances against the Pittsburgh Penguins established ? | What is the nickname of the NHL team that has the most games played in the playoffs against the Pittsburgh Penguins ? | In what division did the NHL team with only one appearance against the Pittsburgh Penguins ( in 2016 ) play ? | Where does the NHL team with a .714 loss percentage against the Pittsburgh Penguins play their home games ?

Answers:
1974 | Caps | Pacific Division | Madison Square Garden