how much of the puck has to cross the line
Goal (ice hockey) For a goal to be scored, the puck must entirely cross the goal line between the posts and under the crossbar of the goal frame. A goal is not allowed under any of the following conditions:
Ice hockey While the game's origins lie elsewhere, Montreal is at the centre of the development of the sport of contemporary ice hockey, and is recognized as the birthplace of organized ice hockey.[22] On March 3, 1875, the first organized indoor game was played at Montreal's Victoria Skating Rink between two nine-player teams, including James Creighton and several McGill University students. Instead of a ball or bung, the game featured a "flat circular piece of wood"[23] (to keep it in the rink and to protect spectators). The goal posts were 8 feet (2.4Â m) apart[23] (today's goals are six feet wide).