Fifty-six years on from their historic FA Cup final meeting, Chelsea and Leeds United go toe-to-toe in the semifinal of this year’s competition. Chelsea triumphed in the vicious battles between the sides in 1970 following a replay, but it was the brutality of the contests—widely considered the dirtiest games in English history—that forged a fierce rivalry. There will be fewer lunges and crunching tackles on Sunday, but there remains plenty at stake. The Blues enter the weekend’s clash in limbo, Calum McFarlane the interim head coach following Liam Rosenior’s recent dismissal. With their Premier League campaign in tatters, the FA Cup could provide some much-needed respite. Leeds have not featured in an FA Cup final since 1973 and are seeking to make history this season as they chase a second ever title in the competition. Given their current trajectory and recent form, they will fancy their chances of piling more misery on Chelsea.…