Cepheus is an artificial intelligence designed to play Texas Hold'em. By playing against itself and learning where it could have done better, it became very good at the game. Slate Star Codex comments:
I was originally confused why they published this result instead of heading to online casinos and becoming rich enough to buy small countries, but it seems that it’s a very simplified version of the game with only two players. More interesting, the strategy was reinforcement learning – the computer started with minimal domain knowledge, then played poker against itself a zillion times until it learned everything it needed to know.
Apparently Cepheus currently just plays against one person. Seeing as it managed to develop amazing strategy for this "very simplified" environment, what's stopping it from working on real/full poker games?