Libratus Poker Bot Defeats Elite Players in High-Stakes Tournament

Libratus, a poker bot developed by researchers at Carnegie Mellon University, has made headlines by defeating four elite players in a no-limit Texas Hold'em tournament. The bot achieved a win rate of 14 big blinds per 100 hands over 120,000 hands, which equates to nearly 90 buy-ins.

Noam Brown, a PhD student at Carnegie Mellon University, described Libratus as the 'holy grail of poker artificial intelligence'. The bot's creators, Noam Brown and Tuomas Sandholm, were surprised by the bot's significant advantage over human players. Libratus' strategy improved significantly after the initial sessions, as it learned to adapt to new betting sizes used by opponents.

Libratus' algorithm allowed it to adjust its strategy in real-time during the turn and river phases of the game. Its predecessor, Claudico, had a less advanced module for calculating river strategies and did not account for blockers. The transition to unique cards and real-time calculation of turn and river strategies gave Libratus a decisive advantage.