The Principle
The knee slice (also called the knee cut) drives the passing-side knee diagonally across the bottom player’s centreline, slicing the inside of the bottom player’s near thigh until the passing knee lands on the floor on the far side of their hip. The mechanic is a diagonal weight-transfer: the passer’s body weight rolls from one side of the bottom player’s hip to the other, ending in a top-side position with the bottom player’s hip pinned beneath the passer’s hip.
The knee slice is the no-gi pressure pass — it works without a single grip on the gi because the structural compression travels through bone-on-bone leg contact rather than through fabric. The passer’s underhook on the slicing side and the same-side cross face are the upper-body grips; the slicing knee is the lower-body engine. The underhook plus cross face plus knee slice is the canonical configuration; missing any one leaves the bottom player a frame to escape with.
Invariables Expressed
Guard passing requires neutralising the bottom player’s hooks, frames, and grips before crossing the hip line.
The knee slice neutralises the bottom player’s near-side leg by pinning it beneath the passing knee. The cross face neutralises the near-side frame. The underhook neutralises the inside-grip recovery. With all three neutralised, the hip line is crossable — without them, the bottom player retains a frame that denies the slice.
Pressure passes use weight transfer through the bottom player’s hip to compromise their base.
The knee slice is the textbook expression of this invariable. The passing knee transfers the passer’s weight diagonally across the bottom player’s near hip, compressing it into the floor and denying the bridge that would normally recover guard. The slice is not a leg movement; it is a hip-weight-transfer using the leg as the lever.
Body-to-body connection eliminates structural space and transfers weight.
The knee slice’s success depends on chest-to-chest connection at the moment the knee crosses the hip. Without the connection, the slice creates space — the bottom player elbow-escapes back to half guard. The cross face and underhook create the connection; the slice transfers the weight that connection makes possible.
Pass completion requires landing in a stable top position, not just clearing the legs.
A knee slice that clears the legs but lands in a scramble has not completed the pass. The slice resolves into mount, side control, or knee-on-belly — each is a stable terminal pin. The slicing motion includes the landing position; passing without committing to the landing concedes the recovery to the bottom player.
The Techniques in This System
Deploying the System
When to enter
The knee slice is the correct pass when the opponent is in an open or half guard configuration with at least one knee bent inward, and your lead knee can reach across the bent knee to the mat on the other side. Three entry triggers. First — any seated or supine open guard where you have broken the guard down to where one of the opponent’s thighs lies across yours: the knee is already in position to slice. Second — a half-guard retention where the bottom player has good knee-shield but weak underhook: the knee slice cuts through the shield if you can beat the underhook to the position. Third — after a failed leg-drag pass: when the drag does not clear the knee line, the knee slice is the backup pass on the same leg.
The knee slice is the wrong pass against a flat-back opponent with both feet in the air (classic open guard with hooks) — there is no thigh across yours to slice. It is also wrong against a strong butterfly hook configuration: the inside hook lifts your slicing leg before the knee reaches the mat. Against those configurations use torreando or smash passing instead.
Live reads inside the system
Four reads. First — has the underhook war been won, lost, or is it still contested? Won underhook is the pass-completion state; lost underhook (opponent has the bottom underhook) means the pass is a back-take threat; contested means re-engage the hand fight before the knee commits. Second — where is the opponent’s bottom knee? A knee that drives into your slicing thigh is trying to return to guard; a knee that falls away is conceding the pass and the opponent is hunting a submission or scramble instead. Third — is the opponent’s head pinned or floating? Pinned head (your cross-face is tight) is the completion phase; floating head means they can still shrimp out. Fourth — is there an inside heel exposed? The knee-slice position is a frequent inside heel hook scramble; know when to abandon the slice for a leg-lock entry.
When the system stalls
The canonical stall is the underhook-and-dogfight — bottom player gets bottom underhook before your knee clears, sits up into a dogfight, and either takes the back or hits a sweep. The tactical response is not to complete the knee slice against a fully secured underhook but to switch sides (back-step to the other hip), exit to a leg-drag on the other leg, or accept the scramble and reset. A second stall is the stall-in-position: knee slice at half depth, opponent framing your hip, neither progressing. This burns energy and eventually concedes the underhook — commit to a pass direction or reset rather than camp in a failing slice. A third stall is the toe hold from below: a bent-leg knee slice leaves your foot exposed; stay aware of the opponent’s grips on your instep or ankle as you pass.
How the System Creates Dilemmas
Knee slice vs underhook
The bottom player’s primary defence is the underhook on the passer’s slicing-side arm. With the underhook, the bottom player can frame and rotate to deep half or to the back take. Without it, the slice clears the legs unimpeded. The grip-fight for the underhook is the central exchange of the system — the passer’s job is to deny it; the bottom player’s job is to land it before the slice commits.
Knee slice vs leg lock entry
In modern no-gi, the bottom player’s defence to the knee slice is increasingly to invert and chase a leg-lock entry on the slicing leg. The passer’s response is the back-step pass — circle the slicing leg out of leg-lock range while using the underhook to keep the upper-body connection. This is the live-exchange version of the continue-vs-reset dilemma seen from the passing side.
Knee slice vs guard recovery
When the slice is partial — knee crossed but no chest connection — the bottom player can shrimp out and recover half guard. The slice-vs-recovery exchange is a tempo question: the passer either commits the chest fast enough to deny the shrimp, or the slice half-completes and the position re-cycles to top half guard.
Progression by Ability Level
- Foundations: Standard knee cut from headquarters. The underhook-and- cross-face configuration. Landing in side control as the default.
- Developing: Knee slice from leg drag. Back step pass against invert defenders. Reading the underhook fight live.
- Proficient: Knee slice all the way to mount. Split-squat variant against knee shields. The slicing motion as a back-take entry when the bottom player rotates.
- All levels: The knee slice is a foundational pass at every level — elite practitioners revisit it because it remains the highest-percentage pressure pass in no-gi.
How This Connects to Other Concepts
The knee slice system is central to the guard passing objectives. It pairs with the half guard passing system at the moment the bottom player traps a leg, and connects to the leg drag dilemma when the pass develops into a back-take exposure. The two-on-one chain also enters the knee slice as a top-position transition.