Who was the opponent of Viktor Korchnoi in the 1981 final match on the Candidates Tournament?
1981 in chess: The major chess events of 1981 were the final match of the Candidates Tournament (between Viktor Korchnoi and Robert Hübner) and the second Karpov–Korchnoi World Chess Championship match. Viktor Korchnoi: Viktor Lvovich Korchnoi (Russian: Ви́ктор Льво́вич Корчно́й ; ] ; 23 March 1931 – 6 June 2016) was a Soviet (until 1976) and Swiss (since 1994) chess grandmaster and writer.
Robert Hübner