Chelsea F.C.–Leeds United F.C. rivalry

The rivalry between Chelsea and Leeds United is a football rivalry between London-based club Chelsea and Yorkshire-based Leeds United. The rivalry first emerged in the 1960s after a series of fiercely contested and controversial matches, when the two clubs were frequently involved in the pursuit of domestic and European honours culminating in the 1970 FA Cup final, which is regarded as one of the most physical matches in English football history.

Source: Wikipedia — Chelsea F.C.–Leeds United F.C. rivalry (CC BY-SA 4.0)