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To be less abstract, let us suppose a game of draughts where the pieces are reduced to four kings… It is obvious that here the victory can be decided (the players being at all equal) only by some recherché movement, the result of some extraordinary exertion of intellect. Deprived of ordinary resources, the analyst throws himself into the spirit of his opponent, identifies himself therewith, and not infrequently sees thus, at a glance, the sole methods (sometimes indeed absurdly simple ones) by which he may seduce into error or hurry into miscalculation