Former chess world champions Anatoly Karpov and Garry Kasparov are in Valencia for a rematch, renewing a battle that began in 1984 in an epic series of world title games that lasted five months
Former world chess champions Anatoly Karpov (left) and Garry Kasparov pose at a press conference in Valencia, SpainPhotograph: Kai Foersterling/EPAWorld chess champion Karpov left and 19-year-old Kasparov in 1982Photograph: RIA Novosti/AlamyKasparov and Karpov, left, in 1982Photograph: RIA Novosti/AlamyIn 1985 Kasparov became the youngest world champion when he beat reigning champion KarpovPhotograph: Miroslav Zajic/CorbisKarpov prepares for a rematch with Kasparov in 1986Photograph: RIA Novosti/Alamy1986: Kasparov v KarpovPhotograph: RIA Novosti/AlamyAugust 1986: World chess championships in London [This caption was amended on 22/12/22. An earlier version said this photograph was from August 1987]Photograph: Jerry Cooke/Corbis1990: New YorkPhotograph: Andrew Holbrooke/Corbis1999: Frankfurt Chess Classic Photograph: Frank Peters/Getty Images2002: New YorkPhotograph: Erik C Pendzich/Rex Features