Four of the world's best professional poker players are about to take on an artificial intelligence system in what A.I. developers are calling an "epic rematch" to find out if machines can outplay humans.

"Since the earliest days of A.I. research, beating top human players has been a powerful measure of progress in the field," said Tuomas Sandholm, professor of computer science at Carnegie Mellon University (CMU) in Pittsburgh. "That was achieved with chess in 1997, with Jeopardy! in 2009 and with the board game Go just last year."

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