Karpov's game (5)
I believe the answer is:
chess
'karpov's game' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for chess that I've seen before include "Benny Andersson and Bjorn Ulvaeus musical" , "This is played on board" , "In which two bishops will participate" , "Ancient war game whose name may have derived for the Persian for 'king'" , "Sixteen-men-a-side game" .)