content: While the KO system gives players a slight advantage, this book neglects the fact that you will only win with counting if you play A LOT. With how much you have to play to make a profit, why stick with an old and oversimplified system? For only a few more hours of work you can learn a level two system and make way more money. The KO system is the easy way out and pays accordingly. Most of this information can be found online anyways. If you are serious about making money counting, leave this count behind and pick up a book with a level two system.