Books, books, books
Tal, Petrosian, Spassky and Korchnoi: A Chess Multibiography with 207 Games, McFarland 2020 Tigran Petrosian (born on 17 June 1929 in Tbilisi), Viktor Korchnoi (born on 23 March 1931 in Leningrad), Mikhail Tal (born on 9 November 1936 in Riga) and Boris Spassky (born on 30 January 1937 in Leningrad) are among the most important chess players of the 20th century. Three of them were world champions, while Viktor Korchnoi came close twice. The four were born between 1929 and 1937; they were rivals, friends, enemies and companions and had a decisive influence on chess in the second half of the ...
Source: chessbase.com