The Two Main Rules
TWO MAIN RULES OF HOCKEY Icing: Player 1 shoots the puck from behind the center line to a point beyond the opponent's goal line (into the offensive zone). When the puck crosses the thin red line that extends the goal line on the outside of the net, icing is called.
Icing is not called when a team is shorthanded, when a defending player could have touched the puck before it crossed the goal line, or if the puck cut across part of the goal crease. The result of an icing violation is a face-off back in Player 1's defensive zone.
Sometimes icing benefits a team trying to break up an attack on its goal. When the defense is disorganized and under heavy pressure, icing is a better alternative than allowing a goal. Icing may also prove a wise strategy when the skaters tire and a line change is needed, but cannot be performed smoothly without a stoppage of play.
Off-side: A team is offside when any member of the attacking team precedes the puck over the defending team’s blue line. Player A and Player B are on the same team. Player A has the puck in what is called the neutral zone. Player B crosses the defending team’s blue line before the puck is in the offensive zone. Thus, Player B is off-side if Player A either passes the puck to Player B or crosses the defending team’s blue line with possession of the puck after Player B has already entered the zone. Simply put, no player may precede the puck into the offensive zone. When the rule is violated, play stops and the puck is faced off in the neutral zone. A player can stay onside if he has one skate over the blue line, and one on it.