List of NHL playoff series

Columns: Opponent | S | Occurrences | GP | Rec | %
Pittsburgh Penguins | 5 | 2007 , 2008 , 2010 , 2013 , 2017 | 27 | 1-4 | .200 | Buffalo Sabres | 4 | 1997 , 1999 , 2006 , 2007 | 21 | 1-3 | .250 | Toronto Maple Leafs | 4 | 2000 , 2001 , 2002 , 2004 | 24 | 0-4 | .000 | New Jersey Devils | 3 | 1998 , 2003 , 2007 | 18 | 2-1 | .667 | Philadelphia Flyers | 2 | 2002 , 2003 | 11 | 2-0 | 1.000 | Montreal Canadiens | 2 | 2013 , 2015 | 11 | 1-1 | .500 | New York Rangers | 2 | 2012 , 2017 | 13 | 1-1 | .500

Example questions:
When did the playoffs start when the Bruins , opponent team of Ottawa Senators participating in NHL playoff series , played ? | When was the opponent team of Ottawa Senators , participating in NHL playoff series , with the second most appearances established ? | When was the opponent team of Ottawa Senators , participating in NHL playoff series , with the 1-3 record established ? | What is the nickname of the opponent team of Ottawa Senators , participating in NHL playoff series , that has the most games played ?

Answers:
April 12 , 2017 | 1970 | 1970 | Pens