How did the Old Course at St. Andrews become what it is today? Garrett Morrison takes a break from the action at the 150th Open Championship to chat with historian Bob Crosby (@otey71) about how golf’s most famous and influential course changed—in surprisingly radical ways—during the second half of the 19th century and the first decade of the 20th. This evolution, Bob argues, has a lot to teach us about the nature of strategic course design. It also accounts for why the Old Course continues to fascinate us today.