<P> Players attempt to arrive at the ruck first, drive forward and bind onto the opposition . Once a ruck is formed the defenders cannot use their hands, making it easier for the attacking team to retain possession . The defenders try to slow the ball from coming out of the ruck, which allows their team more time to organise their defence . This may not be done by using their hands, or lying over the ball, or going to ground deliberately . Such infringements result in penalties if seen by the referee, although the number of bodies involved in the ruck can make this difficult . A legal method used to slow the ball down is counter-rucking, when the defenders drive players back over the ball . If this is done well, the defenders can gain possession of the ball . This is called a turnover . </P> <P> A drive around a ruck or a scrum is usually performed by the forwards and is intended to break the defensive line using weight and force . The ball - carrier runs directly at the opponents and will endeavour to protect the ball so as to retain possession when contact occurs . This play, often referred to as a "pick - up - and - drive", usually offers a slow but sure advance . Sometimes the tactical aim is to suck defenders into a ruck or maul, opening gaps in the defensive line for the backs to exploit . It is also often employed in the closing minutes of the game by the team that has the lead, because it is an effective way of retaining possession and running down the clock . </P> <P> The ball emerges from a maul more slowly than from a ruck . </P> <P> World Rugby announced in 2017 that it would conduct a worldwide trial to a major change to the laws governing the ruck . Under the trial law amendment, a ruck is formed "when at least one player is on their feet and over the ball which is on the ground ." At this moment, the offside lines are set . A player on his or her feet (typically the tackler) can use hands to pick up the ball if the action is immediate, but once an opposing player arrives at the ruck, no hands can be used . Additionally, kicking the ball out of a ruck is explicitly penalised, with only hooking "in a backwards motion" allowed . The trial was used for several international competitions in 2017, among them the World Under 20 Championship, before taking effect in the Northern Hemisphere on 1 August 2017 and in the Southern Hemisphere from 1 January 2018 . The November 2017 Test series will also use the trial ruck law . This trial will run for at least one full year before any decision is made on permanent implementation . </P>

When do you kick the ball in rugby