winning a four-way playoff for two berths at Prague 1970 with 4/6, against Borislav Ivkov, Jan Smejkal, and Ulf Andersson. He advanced, but narrowly missed Candidates' qualification at the Palma de Mallorca Interzonal 1970, tying with Vasily Smyslov for seventh/eighth places on 13½/23, after another late defeat at the hands of one of the outsiders; the winner was Fischer. Portisch and Smyslov played a drawn match (3–3) at Portorož 1971 for a reserve place, with Portisch declared the winner, as his tiebreak score from Palma was superior, though this proved unnecessary. Portisch qualified from the Petropolis Interzonal 1973, scoring 11½/17 for a shared second/fourth place (the winner was Henrique Mecking), then surviving a further three-man playoff for two berths against Lev Polugaevsky and Efim Geller, at Portorož 1973, by winning outright with 5½/8; however, Portisch lost his first-round Candidates' match to Tigran Petrosian in 1974, by 6–7 at Palma de Mallorca. At the 1976 Biel Interzonal, he tied for second/fourth places on 12/19 with Petrosian and Tal, after Larsen. Then, in a three-way playoff for two spots, held at Varese 1976, Portisch scored 4/8 for second place, with Tal being eliminated. In the Candidates' matches, he first advanced to the semifinals after beating Bent Larsen by 6½–3½ at Rotterdam 1977, then lost to Boris Spassky by 6½–8½ at Geneva 1977. In 1979 he advanced from the Rio de Janeiro Interzonal, sharing first/third places, on 11½/17, along with Petrosian and Robert Hübner. Portisch got his revenge against Spassky in 1980, when he tied their quarterfinal match 7–7 in Mexico, and advanced to the semifinals since he had more victories with the Black pieces. He then lost the semi-final to Hübner by 4½–6½ at Abano Terme 1980. Qualifying from the Toluca Interzonal 1982, where he tied for first/second places on 8½/13 along with Eugenio Torre, he lost his first-round match to Viktor Korchnoi by 3–6 at Bad Kissingen 1983. Qualifying from the Tunis Interzonal 1985, where he scored 10/16, he made 7/15 at the Montpellier Candidates' tournament, and was eliminated. At the 1987 Szirak Interzonal, Portisch scored 12/17 to tie for third/fourth places, along with John Nunn; he then defeated John Nunn by 4–2 in a playoff match at Budapest to advance to the Candidates'. He won his first-round match at Saint John, New Brunswick 1988 by 3½–2½ over Rafael Vaganian; he then lost to Jan Timman by 2½–3½ at Antwerp 1989.