How rollouts work

Whoa... being thorough is one thing, but performing over a googolevaluations to roll out a single position is quite another! Fortunately wedon't have to evaluate every position that could potentially result fromeach play to come up with an answer we can have some reasonable confidencein; by taking a shortcut here and there (and adding a dose of samplingtheory) we can get away with much less work than that.