Hockey Offside Explained Simply

In ice hockey, a player is offside when both of their skates completely cross the opponent's blue line before the puck does. In short: the puck has to enter the attacking zone first, and the attackers follow it in. When a player is offside, play stops and there's a face-off outside the zone.

The basic rule

A hockey rink is split into three zones by two blue lines: your defensive zone, the neutral zone in the middle, and the attacking zone in front of the other team's net.

The rule is about the attacking blue line. If an attacking player is completely over that line before the puck crosses it, they're offside. The fix is simple: carry the puck in yourself, or wait until the puck crosses before you do.

Skates count — sticks don't

• Offside is judged by the position of the player's skates. Their stick can be over the line — it doesn't matter.
• A player is only offside when both skates are fully across. One skate on the line or still in the neutral zone means onside.
• A player who is carrying the puck across the line isn't offside, even if their skates cross a moment before the puck.

Delayed offside and tagging up

Offside doesn't always stop play immediately. If an attacker is offside when the puck enters the zone but no attacking player touches the puck, the linesman raises an arm to signal a delayed offside.

The attacking team can then tag up: every attacker inside the zone skates back out to the blue line. Once all of them have cleared the zone, the offside is waved off and they can go back in. If an offside attacker touches the puck first, the whistle blows.

Why hockey has an offside rule

Without it, a forward could simply wait next to the other team's goalie for a long pass. Offside keeps teams moving up the ice together and makes attacks happen through skating and passing — which is a big part of what makes hockey fun to play and watch.

Offside vs. icing

People often mix them up. Offside is about players entering the attacking zone ahead of the puck. Icing is when a team shoots the puck from its own half all the way across the other team's goal line without anyone touching it. They're separate rules with separate signals.

Hockey offside also isn't like soccer offside. In hockey it doesn't matter where the defenders are — only whether you crossed the blue line before the puck.

Three quick examples

1. Too early. A winger skates over the blue line, then a teammate passes the puck in to them. The winger was in the zone first — offside, face-off.
2. Just in time. A center keeps one skate on the blue line until the puck crosses, then steps in. Onside.
3. Puck cleared out. The defending team shoots the puck out of their zone while two attackers are still deep inside. Those attackers have to get back out before the puck is brought in again — otherwise they're offside.

Offside in Ice Hockey Chess

Ice Hockey Chess uses the same idea, simplified for a turn-based board:

• The puck has to enter the attacking zone first. Teammates without the puck can't cross into the zone ahead of it.
• If the puck leaves your attacking zone while your players are still inside, they're offside — shown with a red pulsing outline.
• Until every offside player tags up by skating back over the blue line, nobody on your team can enter the zone, not even the puck carrier.
• Getting the puck back into the zone yourself doesn't cancel the offside — you still have to tag up. If the other team carries or passes the puck back into its own zone, the offside is waved off and no tag-up is needed, as in real hockey.

The game's tutorial has a level just for this, "Offside — Tag Up." It's a great way to see the rule in action at your own pace. For every other rule, read How to Play Ice Hockey Chess.

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