Kass and fellow Amherst students Bob Fein, Richard Jacobson, Robert Marblestone, Steve Ward, Fred Hoxie, Gordon Murray, and others evolved a team frisbee game based on concepts from American football, basketball, and soccer. This game had some of the basics of modern ultimate, including scoring by passing over a goal line, advancing the disc by passing, no travelling with the disc, and turnovers on interceptions or incomplete passes. Kass, an instructor and dorm advisor, taught this game to high school student Joel Silver during the summer of 1967 or 1968 at Northfield Mount Hermon School summer camp. Joel Silver, along with fellow students Jonny Hines, Buzzy Hellring, and others, further developed ultimate beginning in 1968 at Columbia High School, Maplewood, New Jersey, USA (CHS). The first sanctioned game was played at CHS in 1968 between the student council and the student newspaper staff. Beginning the following year, evening games were played in the glow of mercury-vapor lights on the school's student-designated parking lot. Initially players of ultimate Frisbee (as it was known at the time) used a "Master" disc marketed by Wham-O, based on Fred Morrison's inspired "Pluto Platter" design. Hellring, Silver, and Hines developed the first and second edition of "Rules of Ultimate Frisbee". In 1970 CHS defeated Millburn High 43–10 in the first interscholastic ultimate game, which was played in the evening in the CHS's faculty parking lot. Millburn, and three other New Jersey high schools made up the first conference of ultimate teams beginning in 1971. Alumni of that first league took the game to their colleges and universities. Rutgers defeated Princeton 29–27 in 1972 in the first intercollegiate game. This game was played exactly 103 years after the first intercollegiate American football game by the same teams at precisely the same site, which had been paved as a parking lot in the interim. Rutgers won both games by an identical margin. Rutgers also won the first ultimate Frisbee tournament in 1975, hosted by Yale, with 8 college teams participating. That summer ultimate was introduced at the Second World Frisbee Championships at the Rose Bowl. This event introduced ultimate on the west coast of the US. In 1975, ultimate was introduced at the Canadian Open Frisbee Championships in Toronto as a showcase event. Ultimate league play in Canada began in Toronto in 1979. The Toronto Ultimate Club is one of ultimate's oldest leagues. In January 1977 Wham-O