Today marks 90 years since Viktor Korchnoi's birthday on March 23, 1931.
— International Chess Federation (@FIDE_chess) March 23, 2021
One of the strongest chess players to never become world champion (he was a candidate on 10 occasions!), Karpov's match nemesis, Korchnoi was one of the brightest personalities in the history of chess. pic.twitter.com/2RgVscSo7O