Quarter Guard

A shallower, weaker cousin of half guard where the bottom player controls only the top player's ankle/lower shin — rather than the whole leg — using the legs to form a closed-guard-like wrap or mini lockdown around the ankle. Sits earlier in the same progression as Three-Quarter Guard: as a pass advances, Half Guard's whole-leg control degrades to this ankle-only control (Quarter Guard), then to a bare heel hook (Three-Quarter Guard), then to full Mount. Commonly named from either side, mirroring that pattern — bottom-side/half-guard instruction calls it "Quarter Guard," while top-side/passing instruction (e.g. Atos BJJ's Lucas Lepri curriculum: "Knee Cut Pass to Quarter Mount to Mount") calls the same checkpoint "Quarter Mount." It functions as a fallback layer: when a pass compromises full half guard (e.g. the opponent knee-slices through, or the bottom player deliberately loosens the thigh grip to preserve angle rather than lose the exchange outright), quarter guard/mount is the next line of defense before the pass completes. Despite the reduced leg control it still offers real offense from the bottom — sweeps upward (kick toward the hip/back-take), downward (reset into standard or lockdown half guard), or sideways (direct sweep, often with a leg-lock entry available). The position depends on the bottom player staying on their side with hand/underhook control rather than flattening onto their back, which is what keeps it offensive instead of a stalling tactic that collapses toward Three-Quarter Guard/Mount.