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Garry Kasparov, then reigning world Chess champion, defeated Deep Blue (IBM Super Computer) on February 17, 1996. On May 11, 1997, Deep Blue (nicknamed "Deeper Blue" after significant upgrades following the first match) defeated Kasparov in a rematch. This was the first time a computer system defeated a reigning world chess champion during an official chess tournament rules time-controlled match. Kasparov protested and accused IBM of cheating. IBM refused another rematch and dismantled Deep Blue.
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