After a try a conversion may be attempted by place kick or drop kick. If the ball passes over the bar and between the goal posts the conversion is successful and results in a further 2 points. Players may not be tackled without the ball. Play only stops when a try is scored, or the ball goes out of play, or an infringement occurs.
Infringements result in a penalty, or free kick, or scrum.
In a scrum the opposing forwards bind together in a unit and push against the other forwards, trying to win the ball with their feet. Substitutions are only allowed in case of injury and there is no separate offensive and defensive unit. While playing soccer at Rugby School of England in 1823, William Webb Ellis picked up the ball in his hands and ran with it. This sparked an interest, leading to the creation of rugby. Cambridge University immediately adopted the game, popularized it and made local rules.