Canadian football is similar to the U.S. game, but the Canadian field and end zone are larger, measuring 110 yd by 65 yd (100 m by 59 m) and 25 yd by 65 yd (23 m by 59 m), respectively. Canadian teams have 12 players on the field rather than 11 and, among other variations in the rules, are allowed only three downs to advance the ball 10 yards. The present game developed from rules established (1891) by the Canadian Rugby Union. In 1959 the two professional leagues in the union broke away to form the Canadian Football League (CFL). From 1993 to 1995 the CFL had several U.S.-based teams; there are now nine teams divided between two divisions. A number of prominent U.S. players have made careers in the CFL. The league's annual championship game is known as the Grey Cup.