Double Under Pass
Double under pass — both arms under the bottom player’s legs; stack upright, cartwheel or dump to complete.
Adapted from the original page. Grappling.Games did not write this. Sources.
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The double under pass is a guard pass in which the top player threads both arms under both of the bottom player’s legs simultaneously — one arm under each leg — and then stacks the bottom player upright (hips over their own head) before finishing to the side. With both legs controlled at the same time and the bottom player stacked, hip mobility is eliminated and the guard is passed.
The double under grip is most commonly established with the hands clasped together behind the bottom player’s hips — a body-lock style grip that pulls the hips toward the passer and stacks them vertically. Once stacked, the passer cartwheels around the legs or dumps them to one side, ending in side control or north-south.
The pass is high-percentage once the grips are established because the bottom player has almost no hip movement from the stacked position. The challenge is establishing the grips — a guard player who recognises the double under attempt will use frames, arm pushes, and hip elevation to prevent the grip. The double under is best entered as a reaction to the bottom player extending or flattening their guard, not as an initial attack.
INV-07Invariant "Establishing connection is the prerequisite for all control. Where INV-01 describes what sustained connection achieves, INV-07 describes the prior requirement: control cannot begin until connection exists. Distance — whether created by the opponent deliberately or allowed to develop accidentally — returns initiative to the opponent and must be closed before control can be re-established."
Why it works hereThe double under requires both arms under both legs at the same time, which is only possible when the passer's chest is already pressed into the back of the thighs. Any gap between chest and thighs as the grip clasps reduces the stack and lets the bottom player replace guard. The chest drive arrives with the grip, not after — staying tall while threading the arms produces a grip without a stack, which the bottom player escapes routinely.
See full invariant page → The double under depends entirely on close-quarters connection — both arms under both legs simultaneously requires the passer’s body to be tight to the bottom player’s hips. Any gap between the passer’s chest and the bottom player’s legs when the grips are established reduces the stack height and allows the bottom player to replace guard. The passer must drive their chest into the back of the thighs as the grip is clasped. Staying tall or back while attempting double under grips produces a grip without a stack, which the bottom player escapes easily.
INV-G01Invariant "The bottom player must maintain their feet between or at the line of the top player's knees. Losing this line allows the top player to advance without engaging the guard."