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How did Garry Kasparov and FIDE disagree over the world championship in 1993?

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In 1993, the disagreement between Garry Kasparov and the Fédération Internationale des Échecs (FIDE) centered on the governance and organization of the world championship match. After Nigel Short earned the right to challenge Kasparov for the title, both players chose to break away from FIDE’s authority.12

Together, they formed a rival organization called the Professional Chess Association (PCA) to host their championship match. In response to this move, FIDE disqualified Kasparov and stripped him of his world champion title. FIDE subsequently organized its own separate world championship match, which was won by Anatoly Karpov, while Kasparov proceeded to defeat Short in London later that year to become the PCA world champion.12