Korchnoi has beaten or drawn every champ since WWII

Victor Korchnoi (1931-2016): The strongest chess player to have never become world champion. A dubious honor indeed. After hearing of his recent death this past June and knowing of his long career distinguished by strong play even in his later years (a rarity in the chess world) it occurred to me that he may have beaten many world champions in his career. I finally did some research today. Korchnoi has beaten or drawn EVERY world chess champion, be they undisputed OR disputed, at some point, (i.e. not necessarily when they were champion) since the interregnum of WWII.
Victor Korchnoi has beaten:
Undisputed World Chess Champions:
Botvinnik
Smyslov
Tal
Petrosian
Spassky
Fischer
Karpov
Kasparov
Carlsen
FIDE World Chess Champions:
Topalov
Ponomariov
Korchnoi has drawn:
Undisputed World Chess Champions:
Kramnik
Anand
FIDE World Chess Champions:
Khalifman
Kasimdzhanov