Facebook's artificial intelligence on poker beats five professional players at the same time



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TWO YEARS AGO, a poker robot called Libratus, stuffed with professional card sharks at their own game, earned $ 1.7 million. We never answered that a robot would spend $ 1.7 million because fleas were imaginary, but the message was clear: no game is safe, humans.

If you were looking for some form of consolation, it is that Libratus can actually only deal with one player at a time, and face-to-face poker is very different from taking a whole table. Well, now, the follow-up of Libratus – Pluribus – has taken away that little comfort, something the researchers have described as a "recognized milestone in AI".

The search is a joint project between Facebook and Carnegie Mellon, and the bot has been upgraded to full multiplayer poker. For starters, Pluribus has an online search algorithm to search for options. It also offers "faster automatic game algorithms for games containing hidden information".

This is important because poker is a question of bluffs, which is a unique challenge for bots: do it too often and your opponents will be notified, even if your face is totally empty.

And it worked.

"If each chip was worth a dollar, Pluribus would have won on average about $ 5 per hand and would have won about $ 1,000 an hour by playing against five human players," wrote Facebook. "These results are considered a decisive margin of victory by poker professionals."

His human opponents were also reluctantly impressed. "It was incredibly fascinating to play against the poker robot and see some of the strategies that he chose," said Michael Gagliano. "There have been several pieces that humans simply do not do at all, especially regarding the size of their wager."

Chris Fergoson was also impressed. "Pluribus is a very tough opponent to play in. It's really hard to get him into any type of hand, he's also very good at betting on the river, he's very good at pulling the value of his good hands."

"He", indeed. Congratulations Pluribus: you are clearly now one of the guys.

Although all this is very impressive, besides bluffing, it largely involves the probability and ability to remember cards – something in which artificial intelligence has a natural advantage. The journey of Bill and TedIn a situation where you have to beat a bot at a match to stay alive, we recommend football:

Just try to keep the score one digit. μ

Image: Morgan, used under Creative Commons

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