Ninety percent of the book variations have no great value, because either they contain mistakes or they are based on fallacious assumptions; just forget about the openings and spend all that time on the endings.
Chess books should be used as we use glasses: to assist the sight, although some players make use of them as if they thought they conferred sight
I have not given any drawn or lost games, because I thought them inadequate to the purpose of the book.
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