Vasily Smyslov 1957-58 1 1957 8 Mikhail Tal 1960-61 1 1960 9 Tigran V. Petrosian 1963-69 2 1963, 1966 10 Boris Spassky 1969-72 1 1969 11 Bobby Fischer 1972-75 1 1972 12 Anatoly Karpov 1975-85 3 ...