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A professional game consists of three "periods" of twenty minutes, the clock running only when the puck is in play. The teams change ends after each period of play, including overtime.

Icing is an infraction in the sport of ice hockey. It occurs when a player shoots the puck across both the centre red line and the opposing team's goal line, and the puck remains untouched. Play is resumed with a faceoff in the defending zone of the team that committed the infraction.

HOCKEY'S THREE MAIN RULES. Offsides: When any member of the attacking team precedes the puck over the defending team's blue line. Offside (or two-line)Pass: When a player passes the puck from his defending zone to a teammate beyond the red center line.

The jersey is sometimes called a sweater because, during hockey's early years, players actually wore sweaters and not the mesh-like jerseys of today. Ice is approximately 3/4" of an inch thick and is usually chilled at 16 degrees fahrenheit. The thicker the ice, the softer and slower it becomes.

The debate over allowing fighting in ice hockey games is ongoing. Despite its potentially negative consequences, such as heavier enforcers (or "heavyweights") knocking each other out, administrators at the professional level have no plans to eliminate fighting from the game, as most players consider it essential.

Structured ice hockey originated in the mid-1800s in the eastern parts of Canada. James G. Creighton, from Nova Scotia, is generally credited with having taken the so called "Halifax-rules" to Montreal in the 1870s where they eventually were altered to the "McGill-rules".