Computer poker players
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The game of poker (or at least most of the variants) is considered to be computationally unsolvable. However, methods are being developed to at least approximate perfect strategy from the game theory perspective in the heads-up (two player) game, and increasingly good systems are being created for the multi-player or ring game. Perfect strategy has multiple meanings in this context. From a game-theoretic optimal point of view, a perfect strategy is one that cannot lose to any other player's strategy; however, optimal strategy can vary in the presence of sub-optimal players who have weaknesses that can be exploited. In this case, perfect strategy would be one that correctly or closely models those weaknesses and takes advantage of them to make a profit. Some of these systems are based on Bayes theorem, Nash equilibrium, Monte Carlo simulation and Neural networks.
A large amount of the research is being done at the University of Alberta by the GAMES group led by Jonathan Schaeffer who developed Poki and PsOpt. The Poki engine has been licensed for the entertainment game STACKED featuring Canadian poker player Daniel Negreanu.
Pokerbots are bots or computer programs that play online poker disguised as a human opponent. Most (likely all) online poker rooms prohibit the use of bots like WinHoldEm.