The word rivalry, a noun, is defined as “competition for the same objective or for superiority in the same field.” While it is an accurate statement to note that most rivalries are born out of proximity and geographic location (two teams sharing a region of a country/fan base) some rivalries, like the New York Rangers and Pittsburgh Penguins, are hatched in the Stanley Cup playoffs and become the epitome of the true definition of the term.
The Slash
The cities of New York and Pittsburgh are not mortal enemies in any fashion. These two American metropolises are far enough apart on a map of the United States that sharing media markets and fighting for allegiances is not something either side has to worry about.