The IFAB reforms the offside law, reducing the number of opposing players required to be in front of the attacker for him to be onside from three to two.
The first-place Hamilton Tigers of the NHL go on strike for an increase in pay. The team is suspended and the players sold to become the New York Americans.
2 December — the expansion New York Americans and Pittsburgh Pirates of the NHL play their first-ever game against each other at Pittsburgh. The Americans defeat the Pirates 2–1 in overtime.