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I'd say the main value is earning to recognize your opponents' styles and more importantly your own.
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the way the book categorizes your opponents' styles is a major problem
according to some critics. if nearly all your opponents are seeing 90% of the flops and one opponent "only" sees 80% then that one opponent is a "tight" player according to this book.
the same flawed reasoning also applies when the book teaches you how to
recognize your own playing style.