It is the biggest game in the Bundesliga, nowadays intently followed by a vast global audience as well, but it was not always thus. We take a look back at the development of the rivalry between Bayern München and Borussia Dortmund, which started with the latter’s rise to prominence in the 1990s and was cemented when Jürgen Klopp steered the Black-and-Yellows to the top of the pile again just over a decade ago. Der Klassiker - key moments and players from past encounters, by way of a warm-up for the latest instalment.