50-22
The trial
If the team in possession kicks the ball from inside their own half indirectly into touch inside their opponents’ 22, they will throw into the resultant lineout. The ball cannot be passed or carried back into the defensive half for the 50:22 to be played. The phase must originate inside the defensive half.
Primary intention
To encourage the defensive team to put more players in the backfield, thereby creating more attacking space and reducing defensive line speed.