An artificial intelligence (AI) system developed by Carnegie Mellon University (CMU) has defeated four professional card sharks in a 20-day heads-up poker tournament in Pittsburgh. The AI, Libratus, possesses the ability to perform strategic reasoning and the compute power to process the 10 160 possible information sets a game of heads-up no-limit Texas Hold'em poker has. Libratus was developed by professor of computer science Tuomas Sandholm and computer science PhD student Noam Brown, and hosted on the Pittsburgh Supercomputing Center's Bridges computer. According to both Sandholm and Brown, Libratus' victory was not the result of luck. "The best AI's ability to do strategic reasoning with imperfect information has now surpassed that of the best humans," Sandholm said.