Former chess world champion Karpov looks at his opponent Kasparov during a news conference in Valencia...
Former chess world champion Anatoly Karpov (L) looks at his opponent Garry Kasparov (R) during a news conference in Valencia, September 21, 2009, before their 25th anniversary match to be held from Tuesday to Thursday. REUTERS/Heino Kalis (SPAIN SPORT CHESS)