This book is like educational Sudoko for Poker Players. Perfect to brush up on the mental math of poker on the flight out to Las Vegas. The book starts by showing how to estimate your hand's value versus another. Then implied odds are worked on. Finally the idea of calculating your value versus and entire range of hands is taught. The book has hundreds of problems to practice on so that the mental math of poker becomes automatic and intuitive. Estimation techniques and shortcuts are taught so that you can do the right math at the table when you need it. The math is learned through repetition and this book has plenty of problems to practice on.