Here besides the law of retrospection, which regards all the past as a preparation for events that subsequently occur, the law of reciprocity comes in, confusing the whole matter. A good chessplayer having lost a game is sincerely convinced that his loss resulted from a mistake he made and looks for that mistake in the opening, but forgets that at each stage of the game there were similar mistakes and that none of his moves were perfect. He only notices the mistake to which he pays attention, because his opponent took advantage of it. How much more complex than this is the game of war, which
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