Kasparov versus the World

"In 1999, world chess champion Garry Kasparov, widely acknowledged as the greatest player in the history of the game, agreed to participate in a chess match sponsored by Microsoft, playing against "the World". One move was to be made each 24 hours, with the World's move being decided by a vote; anyone at all was allowed to vote on the World Team's next move.

The game was staggering. After 62 moves of innovative chess, in which the balance of the game changed several times, the World Team finally resigned. Kasparov revealed that during the game he often couldn't tell who was winning and who was losing, and that it wasn't until after the 51st move that the balance swung decisively in his favor. After the game, Kasparov wrote an entire book about it. He claimed to have expended more energy on this one game than on any other in his career, including world championship games."

http://michaelnielsen.org/blog/?p=267#comments