To avoid nasty surprises, it also takes into account how the value of different actions would change if opponents shifted their strategies. Instead, Brown and Sandholm developed a search function that looks only a few moves ahead at a time. But it would take too much computing power to explore the almost endless possibilities of a six-player game. Brown and Sandholm’s earlier bot attempted to map out all the possible twists and turns of a game to the end. The new bot is able to play a much more complex game than its predecessor in large part because it’s better at fine-tuning that core strategy by projecting possible outcomes from a particular point in a game-known as the search function. After each hand, the system reviews what happened and what might have worked better-any improvements are added to its core strategy. Pluribus is similar to Libratus in that it built up its skills by playing trillions of hands against versions of itself.
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