 Which mode of exposition affects the story’s plot?
It is a game for lunatics—or else it creates them. What the Machine can do is examine all the likely lines of play for about eight moves ahead—that is, four moves each for White and Black—and then decide which is the best move on the basis of capturing enemy pieces, working toward checkmate, establishing a powerful central position and so on." In crucial situations, say where there's a chance of winning at once by trapping the enemy king, he examines many more moves ahead than that—thirty or forty even. The equivalent of those in the Machine is the directions fed into it before it plays a game."
 The story uses the Doc character to help paint a portrait of what Sandra cannot understand. Namely, the world of chess.
 The story uses the Doc character to help paint a portrait of what Sandra cannot understand. Namely, the world of chess.  The story uses the chess player characters to help paint a portrait of what Sandra cannot understand. Namely, chess.  The story uses Doc to hide the presence of Dr. Krakatower, the Frenchman responsible for defeating the WBM machines.  The story uses the machine’s astonishing capabilities to distract from the true interest of the story: the human intellect’s ability to conquer computers.