Viktor Korchnoi was one of the leading grandmasters of the 20th century, coming within one game of winning the world championship in 1978.
Grandmaster Genna Sosonko was Korchnoi\'s coach and second during tournaments and candidates ma.
A man with a unique - and in many ways tragic - life and career, Korchnoi\'s defection to the West in 1976 was a major event in Cold War politics.
His battles with Karpov for the world crown were among the most important chess matches ever played.
Viktor Korchnoi was one of the leading grandmasters of the 20th century, coming within one game of winning the world championship in 1978