Sevens scrums are smaller, but they still matter.

What a scrum is for

The purpose of a scrum is to restart play with a contest for possession after play has stopped for a reason that is not serious foul play. In sevens, the most familiar scrum causes are knock-ons, forward passes, some unplayable situations, and scrum options given by the laws.

A scrum is not automatically a punishment. It is a structured restart. The team awarded the scrum usually gets the throw-in, but the other team can still compete legally by pushing straight, striking for the ball, and defending from the correct offside line.

Only three players pack down

The main sevens difference is the number of players. Instead of eight players from each team, a sevens scrum has three players from each team. They form as a front row: two props and a hooker.

All three players must stay bound to the scrum until it ends. That requirement matters because an early break can create an unfair defensive or attacking advantage. If a player unbinds illegally, the referee can penalise the offending team.

Scrums restart play quickly

Because only six players are in the scrum, sevens scrums are usually formed and completed faster than 15-a-side scrums. The ball often comes out quickly, and the attacking team wants to move it into space before the defence can reset its full seven-player line.

That speed does not remove the safety requirements. The scrum still has to be square, stable, and stationary before the ball is put in. The referee can slow the process, reset the scrum, or sanction a team if the set-up is unsafe or illegal.

How the ball goes in

The scrum-half from the team awarded the scrum throws the ball into the tunnel after the referee has managed the engagement. The throw must be made without delay, in a single forward movement, and in a way that allows the hookers to contest it under the scrum law.

The hooker from the team throwing in must strike for the ball once it reaches the ground in the tunnel. A front-row player may strike with a foot, but players cannot handle the ball inside the scrum or lift it out while it is still in the scrum.

The referee's engagement sequence

Sevens uses the same basic controlled engagement idea as rugby union. The referee brings the front rows together through the scrum sequence and checks that both teams are square, stable, and ready before the scrum begins.

• The scrum forms at the mark in the scrum zone.
• Players must bind correctly and keep safe body positions.
• Teams cannot push before the ball is thrown in.
• Any push must be straight and parallel to the ground.
• The scrum-half must not delay the throw once the scrum is ready.

Where everyone else stands

Only three players from each team are in the scrum, so the other four players become very important. Players who are not part of the scrum must stay behind the scrum offside line until the scrum ends.

In practical terms, backs must not creep forward early to close down the attack. The defending scrum-half also has limited legal positions around the scrum. If a defender advances too soon or tracks the ball illegally, the referee can award a penalty for offside.

When the scrum is over

The scrum ends when the law says it is over, not simply when spectators can see the ball. In sevens, the usual practical ending is when the ball comes out of the scrum or when the scrum-half plays it from the back.

There is no number eight pickup in sevens because there is no number eight in the scrum. Once the scrum has ended, the players are back in open play and normal offside, tackle, ruck, and advantage rules take over.

When a scrum is reset

If a scrum fails without a clear offence, the referee can stop play and reset it. That can happen when the ball comes out of the tunnel without being won, the scrum collapses or breaks up without an identified offender, neither side wins possession, or the contest becomes unusable.

A reset keeps the same scrum award. It does not mean both teams were equally at fault; it means the referee has not identified a sanctionable offence and wants the restart completed fairly and safely.

Free-kicks and penalties

Scrum offences are not all treated the same. Technical set-up and timing offences can bring a free-kick. Dangerous or unfair scrum actions, offside, illegal binding, pulling, collapsing, lifting, or pushing illegally can bring a penalty.

Sevens also has a specific scrum variation for intentionally kicking the ball out of the tunnel or out of the scrum toward the opponents' goal line: that is penalised. Officials look for whether the action was accidental, technical, unfair, or dangerous before choosing the sanction.

Why teams still care

A sevens scrum uses only three forwards, but it can still decide field position and momentum. The attacking side often wants fast, clean ball to attack a wide defensive line. The defending side wants to pressure the throw-in, hold its offside line, and force the ball-carrier back toward support.

Close to the goal line, a clean scrum can create a dangerous first-phase attack because there are only four defenders outside the scrum. A messy scrum can do the opposite: it slows the attack, gives defenders time to organise, or produces a turnover chance.

Where people get caught

• "Sevens scrums are uncontested": no. They are smaller and usually quicker, but they remain a contest unless a separate competition or safety rule changes that level of play.
• "Only the team throwing in can win it": no. The throw-in team has the advantage, but the opponents can legally contest through the front row.
• "The scrum is over as soon as the ball is visible": not necessarily. The referee judges when it has legally ended.
• "Players can break early because there are only three in the scrum": no. All three sevens scrum players must stay bound until the scrum ends.
• "Every collapse is just a reset": not if a team caused it illegally or dangerously. The referee can award a penalty.

How to read the call

1. Identify why play stopped: knock-on, forward pass, unplayable ball, restart option, or another scrum situation.
2. Check which team was awarded the scrum and where the referee sets the mark.
3. Watch the three-player bind, stability, engagement, and whether either side pushes early.
4. Follow the throw-in, hook, and whether the ball is played legally by feet and lower legs inside the scrum.
5. Look for the ending: ball out, scrum-half plays it, referee whistle, or another law-defined outcome.
6. If the scrum fails, decide whether it is a reset, free-kick, penalty, or advantage.

Source material

• World Rugby Law 19: Scrum
• World Rugby Sevens variation: Scrum
• World Rugby Sevens variations
• World Rugby Laws of the Game