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Kasparov couldn’t believe that he had been beaten by a computer because he felt the play was a sign of superior intelligence. But he was wrong — years later it was revealed by Deep Blue’s co-creator that the triumphant move had been a result of a software bug. When presented with several options, Deep Blue could not make a definitive decision, so made a random move that rattled Kasparov….

From New York Times

I’ll see your program and raise you mine

One of the fundamental differences between playing chess and two-handed poker is that the chessboard and the pieces on it are visible throughout the entire game, but an opponent’s cards in poker are private. This informational deficit increases the complexity and the uncertainty in calculating the best course of action—to raise, to fold, or to call. Bowling et al. now report that they have developed a computer program that can do just that for the heads-up variant of poker known as Limit Texas Hold ’em (see the Perspective by Sandholm).

Science, this issue p. 145; see also p. 122

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