Ball is played from the other box to the very high running support player.
Just before the ball is received, it is run in from the side to the post.
This player is played on and makes a through ball.
The fourth player catches and plays the ball to the now run-through declarer.
High support player runs to the other box, the passer becomes the new high support, the shooter catches and the player from the other box becomes the shooter.
Score 20 through balls from the right and 20 from the left.Indicate with the outer hand, the other hand is bothered by the defender.