The Sporting News brings you a full explanation of the offsides rule in hockey, which can make or break games.

Was Canada's Macklin Celebrini offside on the play that set up Nathan MacKinnon's eventual game-winning goal against Finland?

Canada is moving on to the men's hockey gold medal game at the Olympics after a controversial decision at the end of the game.

Finland challenged Canada's go-ahead goal in the Olympic semifinals, but the decision effectively ended their hopes of tying the game.