Cepheus is a Texas hold 'em poker playing program developed by the computer poker research group at the University of Alberta. In January 2015, an article in Science by Michael Bowling, Neil Burch, Michael Johanson, and Oskari Tammelin claimed that their poker bot Cepheus had "essentially weakly solved" the game of heads-up limit Texas hold 'em. According to the paper, Cepheus' strategy is very close to a Nash equilibrium strategy for heads-up limit Texas hold'em, as an optimal counter-strategy to Cepheus can only win 0.000986 big blinds per game on expectation. Public web access to observe and play against Cepheus is available.