A blue line is one of the two lines that run across the width of a hockey rink, dividing it into three sections: the defensive zone, the neutral zone, and the offensive zone. The blue line marks the boundary for players when entering the offensive zone, and it is important for determining offside calls. A player must have at least one skate inside the blue line before the puck crosses into the offensive zone to avoid being offside. The blue line also plays a key role in setting up plays and defending against attacks.

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