Former chess world champions Garry Kasparov, right, and Anatoly Karpov, left, play an exhibition rematch in Valencia, Spain, Tuesday, Sept. 22, 2009. Chess eminences Kasparov and Karpov are dusting off their knights

Download this stock image: Former chess world champions Garry Kasparov, right, and Anatoly Karpov, left, play an exhibition rematch in Valencia, Spain, Tuesday, Sept. 22, 2009. Chess eminences Kasparov and Karpov are dusting off their knights and pawns for an exhibition rematch marking the 25th anniversary of their first title bout a grueling one that lasted five months and was eventually halted. (AP Photo/Alberto Saiz) - 2P828NW from Alamy's library of millions of high resolution stock photos, illustrations and vectors.

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