1970 and all thatpublished at 11:10 Greenwich Mean Time 13 March 2021
Leeds v Chelsea (12:30 GMT)
The rivalry between Leeds and Chelsea, which is clearly not fuelled by locality (although the north-south divide has fed a geographical angle to the games), first grew in ferocity during the 1960s when both sides were seen as challengers.
Leeds had grown in prominence under Don Revie, mixing supreme ability with the, well, ability to mix it. The Whites weren't a side to take a backward step to anyone.
Chelsea were too enjoying a high point under Tommy Docherty and had players of flair and ferocity themselves.
There were numerous meetings, but the one that really set the rivalry in stone is the 1970 FA Cup final and its replay - two games considered to be amongst the most brutal ever professionally played in this country.
You can read more about them in this piece, written by some nobody.