Korchnoi-Karpov, Baguio 1978, game 17
There are no "what if's" in history. But still, what if Korchnoi had won game 17 in the Baguio match? Then it just may have been that the final score would be 6:5 in his favor, and not in favor of Karpov. And he would have become the world champion thoroughly embarrassing the Soviet government-run chess establishment. And he was winning the game. But Karpov was Karpov. He built a mating net that Korchnoi missed in the time trouble. Nice swindle. Enjoy.