Lockdown

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The lockdown is a half guard configuration in which the bottom player’s legs form a figure-four around the top player’s near leg. The mechanics are specific: the bottom player’s near leg goes under the top player’s leg (between the top player’s legs or around the outside), and the far leg crosses over the top of the trapped leg, with the far foot hooking behind the top player’s calf. The near foot then wraps around and over the far leg to complete the figure-four. The result is both of the bottom player’s legs locked around one of the top player’s legs, with the foot curling behind the calf applying a stretching and controlling force.

The lockdown is not merely a tighter half guard trap. It qualitatively changes what the bottom player can do. Standard half guard traps the leg — the top player’s mobility is reduced but not eliminated. The lockdown stretches the top player’s leg and hip: the calf hook extends the top player’s leg, pulling it backward relative to their hip, which tilts the top player’s whole structure toward the trapped side. The top player cannot simply post and drive because the lockdown removes the posting ability on the locked leg’s side. Their base is compromised, their structure is disrupted, and the bottom player has a handle on the hip that makes getting to the side and driving into the dogfight directly possible.

The lockdown is the foundation position for the 10th Planet Jiu-Jitsu half guard system. Its sweeps, back takes, and submission chains (including the electric chair) all begin here. Understanding the lockdown means understanding why the calf hook’s stretching action is necessary — it is the destabilisation that makes everything from this position work. Without the stretch, the lockdown is just a strong leg trap. With it, it is a control position that compromises the top player’s structure and makes the dogfight stand-up mechanically sound.

Ruleset context This technique is legal in all major competitive formats.

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."

Why it works hereThe lockdown takes the foot-line requirement and converts it into active disruption: the figure-four around the trapped leg places both feet within the knee line and the calf hook stretches the leg backward, tilting the top player's base. Where standard half guard simply blocks the line, the lockdown distorts the line — the top player cannot square their hips because their leg is being pulled out of position. The result is foot-line maintenance with a built-in destabilisation, which is why offensive sequences become available rather than just stalling the pass.

See full invariant page → The lockdown satisfies the foot line in a specific way. In standard half guard, the bottom player’s feet are around the top player’s lower leg, which is within the knee line. In the lockdown, the far foot’s calf hook places the bottom player’s foot behind the top player’s knee line on the trapped leg side — but the figure-four structure means the whole leg is controlled through both of the bottom player’s legs, not just a foot position. The effect is stronger than standard half guard’s compliance with this invariant: not only are the bottom player’s legs within the knee line, they are actively disrupting the top player’s base by stretching the trapped leg. The lockdown is an aggressive form of foot line maintenance — it does not merely maintain position, it controls direction.