Eight observations from the Gaelic football championship

Cork must evolve, RTÉ's Kerry record and more. 

REBEL ALLIANCE: Conor Glass of Derry competes with Cork players, from left, Colm O'Callaghan, Sean Powter, Brian O'Driscoll, Ruairi Deane and Ian Maguire. Picture: Brendan Moran/Sportsfile

How likely is a semi-final shock? There are two clear favourites in the final four of the All-Ireland championship and they were always going to be kept apart after the quarter-finals due to the rule on repeat pairings.

Kerry and Dublin. Already anticipation is growing for a renewal of the key rivalry in Irish sport. A tie steeped in history but what does the history of the semi-finals teach us?