At the 1990 Manila Interzonal, he scored +3−5=5, after beginning with +3=2. In his final appearance in the world championship series, Portisch played well at the 1993 Biel Interzonal, scoring 7½/13 and outperforming his ranking significantly, but did not advance. Portisch was Karpov's second in his last world championship match against Kasparov in 1990. In Hungary, Bobby Fischer was telling Portisch that all the games between Karpov and Kasparov were rigged, so Portisch asked, in that case, "What was I doing there?" Tournament successes Portisch was very active on the international tournament scene from the late 1950s through the early 1990s, and was one of the top performers for over thirty years, with many titles against elite fields. He often finished ahead of the top Soviet Grandmasters at important events, was usually near the top of the table, and only rarely finished with minus scores, showing remarkable consistency. Portisch won at least one major international event per year for nearly two decades. His first top-class round-robin event was Moscow 1959, where he was the youngest contestant, and scored 6/11 for a shared fourth/sixth place; the winners were Spassky, Smyslov, and David Bronstein. At Balatonfüred 1959, he shared third/fifth with 7½/13; the winner was Ratmir Kholmov. Portisch stepped up his activity in 1961. At Budapest 1961, he scored 9/15 for a shared fourth/seventh place; the winner was Korchnoi. At Moscow 1961, he made 6/11 for a shared fifth/seventh place; the winners were Smyslov and Evgeni Vasiukov. Two disappointing results followed, but he was gathering top-class experience, which would come in useful. At Torremolinos 1961, he made only 5/11 for eighth place; the winners were Gligoric and Arturo Pomar. Then at Bled 1961, with six of the world's top eleven players in the field, Portisch scored 8/19 for a shared fifteenth/sixteenth place; Tal won. Beginning in 1962, Portisch became a consistent tournament winner at the international level. He shared the title at Sarajevo 1962 with Svetozar Gligorić on 8/11. He shared second/third places at Kecskemét 1962 on 10½/15 behind Ratmir Kholmov. Portisch won Amsterdam IBM 1963 with 6/9 ahead of Jan Hein Donner. He won Sarajevo 1963 with 7/11, ahead of Gligoric, Vladimir Simagin, Wolfgang Uhlmann, and Borislav Ivkov. At Havana 1964, he scored 14/21 for fifth place as Uhlmann and Smyslov won. At Beverwijk 1964, he was third with 11/15 behind Paul Keres and Iivo Nei. He shared second/third at Málaga