MOSCOW, Russia (CNN) -- Garry Kasparov has defeated the world's greatest chess players and battled a supercomputer for supremacy. Now, he's facing his toughest opponent, but trying to check the power of Russian President Vladimir Putin hasn't been easy. Garry Kasparov, right, says Vladimir Putin's regime is at a "dangerous phase" of turning into a dictatorship. Intensely sharp, the energetic 44-year-old Kasparov, whose political opposition party has been the most vocal against Putin's Kremlin, can hardly suppress his fury with the country's leadership. Jailed for five days before Sunday's parliamentary elections, the brooding grandmaster has spent long hours plotting his moves and countermoves.
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Kasparov: "This regime is entering a very dangerous phase"
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The chess grandmaster has become Russia's leading opposition figure
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A Putin youth leader says accusations against Russian leader are "nonsense"
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Parliamentary elections to be held Sunday
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