Question: Who was the opponent of Viktor Korchnoi in the 1981 final match on the Candidates Tournament?
Sentence (from "Jóhann Hjartarson"): Among his best international tournament results are shared first place at Reykjavík in 1984 and 1992, shared first at World Open 1991 in Philadelphia, equal third at Tilburg 1988 (+3−3=8) and sixth at Belgrade 1989 (+2−2=7).
Relevant evidence: No