Garry Kasparov, the 20-year old Grandmaster from Baku, is already the second highest ranked player in the world and has won several top tournaments including the Soviet Championship. 52 year old Victor Korchnoi was a Grandmaster before Kasparov was even born and already had played two matches for the world title.
Kasparov vs. Korchnoi - London 1983
The Psychology and Tactics of the Title Match
Bobby Fischer's Conquest of the World Chess Championship
International Chess Congress
St. Petersburg 1909
Kasparov vs. Karpov - 1975-1985
Garry Kasparov on Modern Chess - VOLUME II