Lumberjack Sweep
The lumberjack sweep grabs the top player's far ankle from half guard or seated guard while creating a lateral tipping force, sweeping the top player…
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The lumberjack sweep is a half guard or seated guard sweep in which the bottom player reaches for and grips the top player’s far ankle while simultaneously pushing or off-balancing the top player’s near side — creating a lateral tipping force that sweeps the top player over their far leg. The name reflects the motion: like a lumberjack undercutting a tree at the base, the sweep attacks the top player’s base at their far ankle while the body is pushed in the same direction.
The sweep is particularly effective from half guard when the top player is stepping their far leg wide to create a base — the wide-stepped far foot is the sweep target. The bottom player grabs that far ankle with their far hand, pushes on the top player’s near knee or hip with their near hand, and uses the combination of ankle grab and push to tip the top player over their own far foot.
The mechanics are similar to a standing ankle sweep: the base is removed at the ankle while force is applied at the upper body. The half guard context provides the bottom player with the proximity to reach the far ankle without needing to stand.
INV-13Invariant "Destabilisation precedes control. An opponent who retains structural balance can generate defensive force regardless of the position they are in."
Why it works hereThe wide-stepped far foot is the structural element keeping the top player upright over the bottom player. The ankle grab freezes that base — it cannot step further out or hop to recover — and the near-side push then commits the top player's weight laterally over a foot that can no longer adjust. With the base held and the upper body driven sideways, the top player has no balanced configuration available, so defensive hip strength has nothing to brace against.
See full invariant page → The top player’s far-stepped base is the structural element that needs to be destabilised. By grabbing the far ankle, the bottom player prevents that foot from adjusting — removing the top player’s ability to post out or change their base in response to the sweep. The push on the near side creates the tipping force; the ankle grab removes the base that would absorb it. Both are required simultaneously — the ankle grab without the push does nothing, and the push without the ankle grab is resisted by the top player’s base.
INV-06Invariant "Base is a function of weight distribution over a support point. Disrupting the support point disrupts the base regardless of the size of what sits on it."