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 an 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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