8 Adversarial search

A two-player, zero-sum, perfect information game is one in which both opponents have all of the information about the state of the game available to them, and any gain in advantage for one is a loss of advantage for the other. Such games include tic-tac-toe, Connect Four, checkers, and chess. In this chapter, we will study how to create an artificial opponent that can play such games with great skill. In fact, the techniques discussed in this chapter, coupled with modern computing power, can create artificial opponents that play simple games of this class perfectly and that can play complex games beyond the ability of any human opponent.

8.1 Basic board game components

As with most of our more complex problems in this book, ...

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