Eligible	Leningrad iz	Petrópolis iz
From European zonal 1 (2):		Ljubojević, Ivkov
From European zonal 2 (2):	Radulov	Gheorghiu
From European zonal 3 (2):	Rukavina, Smejkal
From Soviet zonal (4):	Tal, Kuzmin, Tukmakov	Savon
From US zonal (2):	Byrne	Reshevsky
From Canadian zonal (1):		Biyiasas
From Central American zonal 1 (2):	Cuéllar Gacharna, Estévez Morales
From South American zonal (2):	Quinteros	Mecking
From West Asian zonal (1):		Kagan
From South-East Asian zonal (2):	Torre	Tan Lian Ann
Seeded from 1971 candidates' matches (6):	Larsen, Korchnoi, Uhlmann, Taimanov, Hübner	Geller
Nominated by FIDE (6):	Gligorić	Polugaevsky, Smyslov, Keres, Hort, Portisch, Stein (deceased), Tal (qualified by Soviet zonal)
Replacements (2):		Bronstein (replaced Stein), Panno (replaced Tal)
Junior world champions (2):	Karpov (1969)	Hug (1971)