The FIDE World Chess Championship 2005 took place in Potrero de los Funes, San Luis Province in Argentina from September 27 to October 16, 2005.
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However, the non-participation of "Classical" World Champion Vladimir Kramnik meant that there were still two competing claimants to World Champion: FIDE Champion Topalov, and "Classical" Champion Kramnik.
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Based on his rating, Topalov was invited to the eight-player, double round-robin FIDE World Chess Championship in San Luis, Argentina, in September–October 2005.