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About:
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Co-author Tuomas Sandholm of Carnegie Mellon University has been grappling with the unique challenges poker poses for AI for the last 16 years. No-Limit Texas Hold 'em is a so-called "imperfect information" game, since there are hidden cards (held by one's opponents in the hand) and no restrictions on the size of the bet one can make. By contrast, with chess and Go, the status of the playing board and all the pieces are known by all the players. Poker players can (and do) bluff on occasion, so it's also a game of misleading information.
Claudico begat Libratus
In 2015, Sandholm's early version of a poker-playing AI, called Claudico, took on four professional players in heads-up Texas Hold 'em—where there are only two players in the hand—at a Brains vs. Artificial Intelligence tournament at the Rivers Casino in Pittsburgh. After 80,000 hands played over two weeks, Claudico didn't quite meet the statistical threshold for declaring victory: the margin must be large enough that there is 99.98% certainty that the AI's victory is not due to chance.
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