This is another defensive zone coverage option which is useful when you need more help down low. In this system the center is responsible for taking away the strong side defense on both sides. This allows the winger to help out down low and should give you a 4 on 3 advantage down low.
The strong side defense and the strong side winger should be on the puck. The weak side defense and winger should be in front of the net. If the puck goes to the other corner, one player can release right away, the other player waits until the wing or defense returns to the front of the net, then they can release to the strong side. The center, on both sides is making sure to take away the pass away from the strong side defense.