From BJJ Heroes:
The worm guard is a grappling position developed by a jiu jitsu competitor named Keenan Cornelius in 2014. The position is applied when the guard player uses his opponent’s lapel and wraps it around his own shin, passing it underneath the opposite leg of the guard passer (i.e.: passer’s left lapel underneath his own right leg), the guardeiro will then make a grip with his far hand. The guard player’s foot will usually be placed passed the opponent’s hip (i.e.: right foot passing top player’s left hip). The leverage created by this control will severely restrict the movement of the passer as well as his ability to put pressure on the bottom grappler, thus creating openings for a variety of sweeps/reversals and back takes.
Great video from BJJ Hacks: 16yo girl uses worm guard on black belt world champion Felipe Costa at Ricardo De La Riva’s Academy in Rio:
