Kasparov and Karpov clash again
Updated on 22 September 2009
Twenty-five years on the erstwhile Russian chess titans Garry Kasparov and Anatoly Karpov take to the board again. Nicholas Glass reports.

It was a battle for world chess supremacy that mirrored the ideological struggle of the times.
Now a quarter of a century after their epic tournament Russian grand masters Garry Kasparov and Anatoly Karpov are meeting again for a historic rematch in
Back in 1984, their chess duel was finally called off after five gruelling months which came to represent the battle between reformers and hardliners in the Kremlin. It was abandoned without a clear winner being declared when the President of the World Chess Federation stopped play on health grounds.
This time, their series of rapid fire games will be played out over just four days.
Kasparov has said the match in Valencia will be a "ceremonial tournament" with a time-limit on moves. He has been training in Oslo with the 18-year-old chess prodigy Magnus Carlsen.
The organisers say Karpov has been training with a group of world-class players and a computer.
Interview: Ray Keene
Jon Snow speaks to former English chess grandmaster Ray Keene about the clash of the chess titans.
