Chess legend Korchnoi dies in Switzerland aged 85

Chess grandmaster Viktor Korchnoi, who defected from Russia to the West in 1976, has died in Switzerland aged 85. Born in 1931 in what is now St Petersburg, Korchnoi survived the siege of Leningrad during World War Two and is seen as one of the best players never to be World Champion. He was a four-time USSR champion and ranked number one in the world in 1965. However, he became convinced he had to leave the Soviet Union after being banned from playing internationally.
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