Scoring
Rugby union is played between two teams – the one which scores more points wins the game. Points can be scored in several ways: a try, scored by grounding the ball in the in-goal area (between the goal line and the dead ball line), is worth 5 points and a subsequent conversion kick scores 2 points; a successful penalty kick or a drop goal each score 3 points. The values of each of these scoring methods have been changed over the years.
The Playing Field
The field of play on a rugby pitch is as near as possible to a maximum of 144m long by 70m wide. In actual game play there should be a maximum of 100m between the two try lines, with anywhere between 10 and 22m behind each try line to serve as the dead ball area. There are several lines crossing it, notably the half way line, the "twenty two", which is 22m from the goal line.
Rugby goalposts are H-shaped, and consist of two poles, 5.6m apart, connected by a horizontal crossbar 3m above the ground. Unlike some other sports there are no goalkeepers, and the section underneath the crossbar has no special meaning. The original pitch dimensions were in imperial, but have since been converted to the metric system.
Match Structure
At the beginning of the game, the captains and the referee toss a coin to decide which team will kick off first. Play then starts with a drop kick, with the players chasing the ball into the opposition's territory, and the other side trying to retrieve the ball and advance it. If the player with the ball is tackled, frequently a ruck will result.
Games are divided into 40-minute halves, with a break in the middle. The sides exchange ends of the field after the half-time break. Stoppages for injury or to allow the referee to take disciplinary action, do not count as part of the playing time, so that the elapsed time is usually longer than 80 minutes. The referee is responsible for keeping time, even when as in many professional tournaments. He is assisted by an official time-keeper. If time expires while the ball is in play, the game continues until the ball is 'dead', and only then will the referee blow the whistle to signal half-time or full-time; but if the referee awards a penalty or free-kick, the game continues.
Passing and Kicking
Forward passing (throwing the ball ahead to another player) is not allowed, the ball can be passed laterally or backwards. The ball tends to be moved forward in three ways — by kicking, by a player running with it or within a scrum or maul. Unlike in American football, "blocking" is not allowed, so only the player with the ball may be tackled or rucked. When a ball is knocked forward by a player with his/her arms, a "knock-on" is committed, and play is restarted with a scrum.
Any player may kick the ball forward in an attempt to gain territory. When a player anywhere in the playing area kicks indirectly into touch so that the ball bounces in the field of play the throw-in is taken where the ball went into touch. If the player kicks directly into touch from within their own 22 meter line the lineout is taken by the opposition where the ball went into touch, but if the ball is kicked into touch directly by a player outside the 22 meter line the lineout is taken level to where the kick was taken.
Breakdowns
The aim of the defending side is to stop the player with the ball, either by bringing them to ground (a tackle, which is frequently followed by a ruck), or by contesting for possession with the ball-carrier on their feet (a maul). Such a circumstance is called a breakdown and each is governed by a specific law.
A player may tackle an opposing player who has the ball by holding them while bringing them to ground. Tacklers cannot tackle above the shoulder (the neck and head are out of bounds), and the tackler has to attempt to wrap their arms around the player being tackled to complete the tackle. It is illegal to push, shoulder-charge, or to trip a player using feet or legs, but hands may be used (this being referred to as a tap-tackle or ankle-tap).
Mauls occur after a player with the ball has come into contact with an opponent but the handler remains on his feet; once any combination of at least three players have bound themselves a maul has been set. A ruck is similar to the maul, but in this case the ball has gone to ground with at least three attacking players binding themselves on the ground in an attempt to secure the ball.
Lineout
When the ball leaves the side of the field, a lineout is awarded against the team which last touched the ball. The forwards of each team (though not necessarily all of them, their number is throwing-in team option) line up a meter apart, perpendicular to the touchline and between 5 m and 15 m from the touchline. The ball is thrown from the touchline down the centre of the lines of forwards by a player (usually the hooker) from the team that did not play the ball into touch. The exception to this is when the ball went out from a penalty, in which case the side who gained the penalty throws the ball in.
Both sides compete for the ball, and some players may lift their teammates (While the laws say that jumping players may only be supported, lifting is uniformly tolerated under specified conditions). A jumping player cannot be tackled until they stand and only shoulder-to-shoulder contact is allowed; deliberate infringement of this law is dangerous play, and results in a penalty kick.
Scrum
A scrum is a way of restarting the game safely and fairly after a minor infringement. It is awarded when the ball has been knocked or passed forward, when a player is accidentally offside or when the ball is trapped in a ruck or maul with no realistic chance of being retrieved. A team may also opt for a scrum if awarded a penalty.
A scrum is formed by the eight forwards from each team binding together in three rows. The front row consists of the two props (loose head and tight head) either side of the hooker. The second row consists of two locks and the two flankers. Behind the second row is the number 8. This formation is known as the 3–4–1 formation. Once a scrum is formed the scrum-half from the team awarded the feed throws the ball into the gap between the two front-rows known as the tunnel. The two hookers then compete for possession by hooking the ball backwards with their feet, while each pack tries to push the opposing pack backwards to help gain possession. The side that wins possession transfers the ball to the back of the scrum, where it is picked up either by the number 8 or by the scrum-half.
Officials and Offences
There are three match officials: a referee, and two assistant referees. The latter, formerly known as touch judges, had the primary function of indicating when the ball had gone "into touch"; their role has been expanded and they are now expected to assist the referee in a number of areas, such as watching for foul play and checking off-side lines. In addition, for matches in high level competitions, there is often a television match official (TMO; popularly called the "video referee"), to assist with certain decisions, linked up to the referee by radio. The referees have a system of hand signals to indicate their decisions.
Common offences include tackling above the shoulders, collapsing a scrum, ruck or maul, not releasing the ball when on the ground, or being off-side. The non-offending team has a number of options when awarded a penalty: a "tap" kick, when the ball is kicked a very short distance from hand, allowing the kicker to gather the ball and run with it; a punt, when the ball is kicked a long distance from hand, for field position; a place-kick, when the kicker will attempt to score a goal; or a scrum. Players may be sent off (signaled by a red card) or temporarily suspended ("sin-binned") for ten minutes (yellow card) for foul play or repeated infringements, and may not be replaced.
Replacements and Substitutions
During the match, players may be replaced (for injury) or substituted (for tactical reasons). A player who has been replaced may not rejoin play unless he was temporarily replaced to have bleeding controlled; a player who has been substituted may return temporarily, to replace a player who has a blood injury, or permanently, if he is replacing a front-row forward. In international matches, up to seven replacements are allowed; in domestic or cross-border tournaments, at the discretion of the responsible national union(s), the number may be increased to eight, of whom three must be sufficiently trained and experienced to provide cover for the three front row positions.
