https://www.scientificamerican.com/article/ai-conquers-six-player-poker/

During a 2017 casino tournament, a poker-playing program called Libratus deftly defeated four professional players in 120,000 hands of two-player poker. But the program’s co-creator, Tuomas Sandholm, did not believe artificial intelligence could achieve a similar performance against a greater number of players.

Two years later, he has proved himself wrong. Sandholm has co-created an AI program called Pluribus, which can consistently defeat human experts in six-player matches of no-limit Texas Hold’em poker. “I never would have imagined we would reach this in my lifetime,” says Sandholm, a professor of computer science at Carnegie Mellon University.