Cutting the enemy king out of the game.
After 52.fib4 a5 53.fic6 (or 53.fic2 «¿>f6 54.&el e3 55.<4>fl <4g5 and Black invades) 53.,.a4 54.fia5 <&d5 Black wins. He can also go after the g5-pawn. 52...fixa4
Finally the weak a-pawn falls.
In the Soviet Championship Karpov suffered a loss against Geller in the third round, but nevertheless managed to take the lead and eventually win the tournament. The fact that he saved the following endgame was important.
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