That means that this particular variant of poker, called heads-up limit hold’em (HULHE), can be considered solved. ... A few other popular games have been solved before. In particular, in 2007 a team from the same computer-science department at Alberta — including Neil Burch, a co-author of the latest study — cracked draughts, also known as checkers. But poker is harder to solve than draughts. Chess and draughts are examples of perfect-information games, in which players have complete knowledge of all past events and of the present situation in a game. In poker, in contrast, there are some things a...