I have purchased several copies of this book over the years. I bought the first one to sharpen my play and my wife's play when, in graduate school, we got together with our best friends (two other married couples) and played into the early morning hours (A total of $15.00 at stake--$2.50 each!). This latest purchase is a gift to a friend who is interested in the beginnings of our current intelligence agencies--NSA, CIA etc. No doubt there are better poker guides on the market: No doubt Yardley's guide is the only one worth reading just for the fun of it. (See Yardley's "The American Black Chamber")