FIDE Master Aviv Friedman uses Anatoly Karpov’s games to recognize the relevance of isolated Pawns (and Pawn structure in general) in the middlegame.

Vasily Smyslov vs Anatoly Karpov, USSR Championship (1971): D41 Queen’s Gambit Declined, Semi-Tarrasch with e3
Lajos Portisch vs Karpov, Milan (1975): E53 Nimzo-Indian, 4.e3, main line with …c5
Viktor Korchnoi vs Karpov, Karpov – Korchnoi World Championship Rematch (1981)