WORM GUARD

Worm guard is the gi-specific open-guard variant developed by Keenan Cornelius in the early 2010s, in which the bottom player feeds the opponent's own lapel between the opponent's legs and grips it on the far side, creating a control system that uses the gi as an active offensive tool rather than just a grip surface. The position is one of the most innovative open-guard developments of the modern era and one of the few entirely new positions invented in BJJ in the last twenty years.

The entry is established when the bottom player has access to a partially-opened opponent's lapel (typically after a grip-fight has loosened the gi) and can thread the lapel under the opponent's near leg. The bottom player grips the lapel on the far side with their same-side hand, creating a long lever that controls the opponent's leg, hip, and balance simultaneously through the gi. The free hand can establish secondary grips on the opponent's pant cuff, sleeve, or collar to add additional control vectors.

From worm guard the bottom player has access to a range of sweeps that use the lapel as the primary lever — the worm guard sweep (pulling the lapel across to off-balance the opponent), the back-take when the opponent rotates to escape, and various transitions to crab ride or reverse de la riva when the lapel control needs to be released. Keenan Cornelius and the Lloyd Irvin / 50/50 team developed the system across multiple instructional series, and modern competitors like Jake Mackenzie and Edwin Najmi have continued to refine the position.

The IBJJF and other federations have grappled (literally) with how to rule on lapel guards: the worm guard and its variants (squid guard, octopus guard, ringworm guard) blur the line between active grip and stalling pin, and rule revisions have at times restricted certain lapel configurations. Defensively the worm guard is escaped by removing the lapel from the bottom player's grip (the position dissolves the moment the lapel is recovered), by stepping over the lapel-controlled leg, or by attacking a leg lock if no-gi rules permit (which they typically do not, since the position is gi-only).