Kyle Shanahan is considered one of the top offensive minds in all of football. His system stresses every defender on the field, in every direction. With a heavy emphasis on the techniques, teaching, and theory behind the offense, this book takes readers through each concept in Shanahan's extensive playbook.The roots of his system are from his father, Mike Shanahan, and mentor Gary Kubiak. His offense goes much further beyond that, as he has expanded his drop back pass aersonal over the years to make one of the most quarterback friendly schemes while relentlessly attacking the defense. He is one of the best coaches at getting receivers open early in a quarterback's progression, often using play action to isolate certain defenders. This is crtical not only for the quarterback, but it makes the offensive line's job much easier. The 49ers also boast one of the most diverse and effective running games in all of football. Shanahan took the outside zone base of the system and expanded it to have answers for every defense. This book breaks each one down, and diagrams each against the commonly used defenses they faced. Included are the minor tweaks and variations for each concept game planned each week that often generated big plays.