1. Nf3 d5 2. g3 c5 3. d3 Nc6 4. Bg2 e6 5.
Better is 8... Qc7 , as Karpov himself switched to in the late 70s.
Perhaps better is 9... >= exd5 10. d4! cxd4 11. Nb3 
though
Black's isolated pawn presents potential problems.
12... >= Nxd4 13. Qxd4 Bb7 14. c4
13. Bg5! 
As Steve Stoyko says, "When White knows where to deploy his dark-squared Bishop in the King's Indian, the game is usually over."
John Hall and Jan Cartier in their book "Modern King's Indian Attack" where this game appears write, "The personable and very talented master Michael Valvo is caught asleep at the switch, though his opponent deserves full credit for his aggressive tactics." Mike immediately resigned rather than submit to something like
14... gxf6 15. Bxf6 Qe8 16. Nxc6 Bxc6 17. Qd2 Bxg2 18. Qg5+ Ng6 19. Qh6 1-0
