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A certain subsidiary desire is
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to protect its king, to capture my king.
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A certain other subsidiary desire is,
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no doubt, to protect its various other pieces along the way.
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It's got beliefs about how to do that by blocking certain paths
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or by making other pieces on my side vulnerable.
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It's got beliefs about how to achieve its goals.
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Then, it puts those combinations of beliefs
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and desires into action by moving in a way
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that's a rational response to my move.
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It looks as though the natural thing
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to say about the chess-playing computer is,