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He had several famous competitions with computers programmed to defeat him. While he won early matches against the machines, he but ultimately succumbed to advances in computer technology, losing the series to Deep Blue in 1997. Kasparov considered the match to be unfair, as he was not allowed to view earlier games played by the computer, but all of his matches were analyzed and specifically programmed for the computer. Kasparov requested a rematch, but was denied and his computer opponent retired. In the final contest between Kasparov and the most advanced computer, they battled to a draw.<ref>http://www.geocities.com/SiliconValley/Lab/7378/comphis.htm</ref>
Kasparov later lost his championship title to [[Vladimir Kramnik]] in 2000. When there was difficulty in securing a rematch for several years despite Kasparov consistently showing himself as the #1 challenger, Kasparov retired and started the [[United Civil Front]], an organization devoted to preserving democracy in Russia.
In 2007, Kasparov announced his intentions to run for the Russian Presidency, and was nominated by his party. However, he later withdrew from the race, citing the fact that his opponents refused to give him space for a rally, in defiance of Russian election law.<ref>http://sports.espn.go.com/espn/news/story?id=3043579</ref>
