HOCKEY RULES EXPLAINED
Every NHL rule explained in plain language. From icing to offsides, power plays to penalty shots -- what the refs actually call and why it matters.
THE BASICS
Players
6 per team on the ice (5 skaters + goalie)
Periods
3 × 20 minutes = 60 minutes total
Tiebreaker
5 min 3-on-3 sudden-death OT, then shootout (regular season)
Playoffs
20 min sudden-death OT periods until someone scores
Offsides
No attacking player crosses the blue line before the puck
Icing
No shooting from behind center line to the far end boards
Penalties
2 min (minor), 4 min (double minor), 5 min (major), 10 min (misconduct)
OFFSIDES
Offside (also called entering the zone early) is called when an attacking player enters the offensive zone -- crosses the blue line -- before the puck does. When this happens, play is immediately stopped and a faceoff occurs in the neutral zone near where the offside was called. The intent is to prevent "cherry picking" -- a player waiting near the opponent's net for a long pass.
Attacking blue line
The blue line closest to the opponent's net. You must wait for the puck to cross before you enter.
Puck must enter first
If the puck is already in the offensive zone, players can follow the puck in. The puck always has right of way.
Linesman judgment
Linesmen make the call in real time. There is no coach's challenge for offsides in the NHL -- but coaches can challenge for offside if they have a coach's challenge available and can show the puck entered before the player.
Delayed offside
If an attacker is in the zone when the puck enters, the linesman holds the whistle until they exit and re-enter legally. This is called a "delayed offside" and is signaled by the linesman holding his arm up.
ICING
Icing is called when a player shoots the puck from their side of the center line, across the opponent's goal line, and out of play -- without it being touched by anyone. The result is a faceoff in the defending zone of the team that iced the puck. Icing is one of the most commonly confused rules because it depends on where the puck is shot from.
Shot from behind the center line
The puck must be shot from the shooter's side of the center red line. If it's shot from inside the neutral zone, it's not icing.
Crosses the goal line
The puck must cross the goal line (the red line at the back of the rink) to count.
No touch required
The defending team does NOT need to touch the puck for icing to be called. As soon as the puck crosses the goal line, the linesman signals icing.
Penalty kill exception
A team on the penalty kill CANNOT ice the puck. If they shoot it from behind center and it goes out, play continues. This gives the shorthanded team an incentive to dump the puck and relieve pressure.
PENALTIES
A penalty is called when a player commits a infraction listed in the NHL rulebook. When a penalty is called, the offending player serves time in the penalty box and their team plays short-handed (with one fewer skater). The penalty clock runs in real time, not game time.
Minor penalty (2 min)
The most common call. Roughing, tripping, slashing, hooking, interference -- all minor penalties. If the other team scores while on the power play, the penalty ends.
Double minor (4 min)
Usually called when a minor penalty causes an injury (e.g., high-sticking that causes bleeding). The penalty is served for 4 minutes and does NOT end early if the other team scores.
Major penalty (5 min)
Called for fighting (5-minute major + game misconduct) or for hits deemed reckless enough to warrant a double. Major penalties do NOT end early when the other team scores.
Misconduct (10 min)
Player is ejected from the game but a teammate serves the penalty. The team does NOT play short-handed -- the misconduct player sits 10 minutes but their team continues at full strength.
POWER PLAY & PENALTY KILL
A power play occurs when a team has a numerical advantage because an opponent is serving a penalty. The team with the extra player has 5 skaters vs 4 (or 5 vs 3). The team that is short-handed is on the penalty kill. This is one of the most analyzed situations in hockey analytics.
When it starts
The moment the referee signals the penalty and the penalized player enters the box, the power play begins.
When it ends
For minor penalties: if the team on the power play scores, the penalty ends early and the penalized player returns. For major penalties: the penalty runs the full 5 minutes regardless of goals.
Goalie on power play
If the penalized team pulls their goalie (6th attacker), and the team on the power play scores into the empty net, the penalty does NOT end early -- the penalty is still served in full for minors.
5-on-3
If a team takes two penalties simultaneously, they play with 3 skaters vs 5. 5-on-3 is a significant advantage -- teams usually score quickly in these situations.
FACEOFFS
Faceoffs restart play after a stoppage -- the two centers clash sticks over the puck at a designated spot on the ice. Faceoffs happen in all three zones and are one of the most underrated skills in hockey. A center who wins draws consistently gives their team more offensive zone time.
Faceoff locations
After an offside: neutral zone. After icing: defensive zone of the team that iced. After a penalty: offensive zone of the team with the power play.
Faceoff violations
If a center or winger moves before the puck drops, they're assessed a warning and their opponent gets the draw. Centers who consistently false-start can lose the draw and their teammate takes it.
Wingers' role
Wingers must be positioned correctly during a faceoff: inside the dots, on their side of the faceoff circle, outside the hashes. Violations give the opponent the draw.
PLAYOFF RULES
Playoff hockey uses the same rules as regular season with two critical differences: there is no shootout (ties are resolved by overtime periods until a goal is scored), and regular-season overtime is 5 minutes of 3-on-3. In playoffs, overtime is full 20-minute sudden-death periods played at 5-on-5 until a goal is scored.
No shootout in playoffs
If a playoff game is tied after 60 minutes, play continues in 20-minute sudden-death overtime periods. The longest playoff game was 4 OT periods -- over 4 hours of hockey.
5-on-5 overtime
All overtime in the playoffs is played 5-on-5, unlike the 3-on-3 format used in regular season overtime. This makes playoff OT a grueling endurance battle.
Same penalties apply
Penalties still exist in playoffs. If a team takes a penalty in overtime, the opposing team plays 5-on-4 for the duration of the penalty. A 5-on-3 power play in playoff OT is nearly impossible to survive.
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