What a scam. I am convinced those who rated this outdated and useless book highly were paid endorsements. In a street fight, if you honestly believe you are going to get someone, swinging at you like a Mike Tyson, in a wrist lock you should be beaten to an inch of your life. Maybe only then will you see the lunacy of your thinking. Don't get me wrong. Wrist locks have a place for police officers who arrest drunken miscreants who fully comply. But this book is rediculous. The pictures are old and gritty, unclear, vague, and really, how much can you learn this subtle art from a book? If you think you can, I have a book I'd like to sell you on teaching you how to fly a 747 jet airliner. All you do is read the book and you are ready to fly the jet--the same day. I hate scam artists and this is yet another one who is trying to use fear to sell smake oil.