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Rugby union (rugby à XV) is a collective contact sport played between two teams of fifteen players. The oval ball is passed by hand backwards or kicked forwards, and the aim is to score by grounding it in the opponents' in-goal or kicking it between the posts. Play alternates between running and tackling phases and set phases such as the scrum, lineout, ruck and maul.

Score more points than the opponent by crossing their goal line to ground the ball (a try) or by kicking it between the posts. The team with the most points at the end of regulation time wins.

• •The ball may be passed by hand only backwards or sideways; a forward pass is not allowed.
• •You advance the ball by running with it or by kicking it forward.
• •Tackling is only permitted with the arms and below the shoulders, on the ball carrier.
• •After a tackle the carrier must release the ball, and players must respect the offside line on the ground (ruck).
• •A try is scored by grounding the ball yourself in the opponents' in-goal with downward pressure.
• •Offside penalises a player who is in front of the ball and active in play; the details depend on the phase.

A try is worth 5 points and earns the chance at a 2-point conversion kick. A successful penalty kick and a drop goal (drop kick in open play) are each worth 3 points. A penalty try, awarded when a foul prevents a probable try, is worth 7 points with no conversion.

A match lasts 80 minutes, split into two halves of no more than 40 minutes (effective playing time), separated by a break of up to 15 minutes as set by the organiser. If a knockout match is tied, extra time may be played according to the competition's rules.

The team with the most points at the end of regulation time wins the match. A match may end in a draw, unless the competition provides for extra time or another tie-breaking procedure.