Group Agreement, each agreement addressing amateurism and college football. The Ivy Group Agreement, adopted in 1945, states for football, "the players be truly representative of the student body and not a group of special recruited and trained athletes." Harvard president Nathan Pusey and Yale president A. Whitney Griswold collaborated closely toward the eventual implementation of the Ivy League in 1954 with the "Agreement" extended to all sports. Round-robin play started in 1956 for football among programs representing Brown University, Columbia University, Cornell University, Dartmouth College, Harvard University, Princeton University, University of Pennsylvania, and Yale University. Game results † The 1881 game is recognized by both teams as a Yale victory due to four fewer safeties. ‡ Hosted ESPN's College Gameday. All games since 1956 are Ivy League contests. The teams did not play in 2020 due to the Ivy League cancelling the 2020 football season because of the COVID-19 pandemic. Regular season overtime was introduced for Division I-AA in 1981 and was first used in the 2005 game. Stadiums The contests are hosted in stadiums listed on the U.S. National Register of Historical Places and are U.S. National Historic Landmarks. They are among the oldest gridiron football stadiums. Designs for the Rose Bowl and Michigan Stadium were influenced by the Yale Bowl Stadium, 276 Derby Avenue, West Haven, Connecticut. When the Bowl was built by developer Charles Ferry in 1914 the Colosseum of Pompeii in Italy was the only other known structure in the world engineered by digging a hole then using the displaced dirt to build the surrounding wall or berm. The Bowl had the largest seating capacity for a stadium in the world upon completion of construction. Head coach Carm Cozza likened the feeling of running through the tunnel then onto the Bowl's to a gladiator entering the arena. The Yale Bowl, completed before World War I, presaged a collegiate stadium-building blitz associated with the game's popularity in the Roaring Twenties. The modern era of college football, with radio broadcasts coast to coast of gridiron exploits by Red Grange or the Four Horsemen of Notre Dame, began soon after the construction of stadiums that rivaled the Yale Bowl's seating capacity. The Rose Bowl venue, its annual post-season contest, and the plethora of venues and post-season football contests known as "bowls" has been attributed to the Yale Bowl. Walter Camp had been the long-tenured treasurer of Yale Athletic Union,