Ronald Perry is a life-long learner and reader of almost everything ever published of importance on Blackjack. Over the years, he incorporated the best techniques into betting and card play, discarding those that don't work, and thus evolving the system into what is now the methodology you are about to learn. Everything in this book is absolutely true and accurate. If there were a better system in the world, Maverick would be using it. In 1975, Ron applied the Systems Approach to the Blackjack process. The model integrates the requirements for playing the game. The goal of MASTER 21 is to maximize session winnings and reduce losses. The crux of the system is to know the percentage of high cards remaining after each card is dealt from either single or multiple deck games. Percentages are grouped into ranges called Color Zones™. Each Zone identifies an appropriate bet or playing strategy. It is a huge advantage to know the card Count and percentage of remaining high cards.