Overconfidence Breeds Error When We Take For Granted That The Game Will Continue On Its Normal Course

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Overconfidence breeds error when we take for granted that the game will
continue on its normal course; when we fail to provide for and unusually
powerful resource--a check, a sacrifice, a stalemate. Afterwards the victim
may wail, `But who could have dreamt of such an idiotic-looking move?'
-- Fred Reinfeld, "The Complete Chess Course"

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