At the first tournament in 1920, there were many differences from the modern game: games were played outdoors on natural ice, forward passes were not allowed, the rink (which had been intended to be used only for figure skating) was 56 m × 18 m (165 ft × 58.5 ft) and two 20-minute periods were played. Each team had seven players on the ice, the extra position being the rover. Following the tournament, the IIHF held a congress and decided to adopt the Canadian rules—six men per side and three periods of play.