A quiet mountain resort in Merano, northern Italy, has become the mecca for chess fans all over the world for what promises to be the final showdown between two outstanding players, World Champion Anatoly Karpov and challenger Viktor Korchnoi. Paul Jennings explains how the longstanding feud between Karpov and Korchnoi came about and sets the scene for their second World Championship title clash.
(A new series of The World Chess Championships starts on Tuesday, 6.55pm)