Why must shoulder pressure be established before attempting to extract the trapped leg in the Knee Through pass?

Shoulder pressure compresses the opponent's defensive frames and limits their ability to create space for guard recovery. Without proper upper body control, the opponent can easily use their hands and knee shield to prevent the pass or execute sweeps. The pressure also prevents them from sitting up or establishing an effective underhook. Attempting to pass with just leg movement allows the opponent to maintain active frames and control the distance, making the pass almost impossible against a competent bottom player.

What is the primary mechanical difference between the Knee Through pass and the Knee Slice pass?

The Knee Through drives the trapped knee forward in a straight line through the opponent's guard structure, punching directly toward the far side of the mat with linear force. The Knee Slice cuts the knee across the opponent's body at an angle, slicing through their guard laterally with hip rotation. The Knee Through is more pressure-based and direct, relying on aligned body weight, while the Knee Slice incorporates lateral movement and is often combined with leg weave or hip switching mechanics.

Your opponent establishes a strong underhook on your near side while you are setting up the Knee Through. How do you respond?

The underhook must be addressed immediately because it is the half guard player's most dangerous offensive tool. You can apply a strong whizzer to neutralize the underhook and fight to re-establish your own, switch to a Knee Slice Pass variation that works with their underhook rather than against it, or exploit the space their underhook creates by stepping over into mount. Continuing to force the Knee Through against a strong underhook typically results in being driven to your back or swept because the underhook gives them the leverage to off-balance your passing structure.

Why is it critical to drive the knee in a straight line rather than cutting across the body during the Knee Through?

Driving straight through penetrates directly into the opponent's guard structure along the same vector as your shoulder pressure, creating a unified force that is extremely difficult to redirect. Cutting across at an angle separates your knee movement from your pressure line, exposing your leg to recapture and putting you off-balance for sweeps. The straight-line drive also allows you to maintain better shoulder connection throughout the movement, while an angled cut often requires you to rise up and sacrifice the pressure that makes the pass work.

What conditions must exist before you should attempt the Knee Through pass rather than an alternative half guard pass?

The Knee Through requires dominant upper body control with crossface established, the opponent's underhook denied or controlled, and the opponent playing a relatively static defensive half guard. It excels when you can negate their frames with sustained pressure. Choose alternative passes when the opponent has an established underhook, is using dynamic leg configurations like Deep Half Guard or Lockdown, has an active knee shield creating significant distance, or is actively threatening sweeps that require immediate defensive attention before you can commit to passing.

How does proper hip-to-shoulder alignment contribute to the success of the Knee Through pass?

Hip-shoulder alignment creates a unified line of pressure that prevents the opponent from creating angles of escape. When hips lag behind shoulders, a gap opens between your upper and lower body that the opponent can exploit with frames, hip escapes, or knee shield re-insertion. Proper alignment positions the trapped leg optimally for extraction because the hip angle determines the knee's forward path. Aligned hips also allow you to drive pressure efficiently through your core structure rather than relying on arm strength or compromised leverage angles.

Knee Through Attacker | BJJ Technique Guide

The Knee Through pass attacks from half guard top by driving the trapped knee forward in a straight line through the opponent’s guard structure while maintaining crushing upper body pressure. This pass rewards patience and systematic control establishment over explosive movement. The key mechanical principle is that forward knee drive combined with aligned shoulder pressure creates a unified force vector that the bottom player cannot redirect with frames or hip escapes. Unlike passes that require you to create angles or change levels, the Knee Through succeeds through direct, relentless forward pressure that compresses the opponent’s defensive structure until it collapses. Mastery requires understanding the precise sequence of upper body control, hip alignment, knee insertion, leg clearing, and immediate consolidation that transforms half guard top into dominant side control.

From Position: Shin-to-Shin Guard (Top)

Key Attacking Principles

What are the key principles for executing Knee Through?

Establish dominant shoulder pressure before initiating any knee movement to compress defensive frames
Control the opponent’s near side arm to prevent their primary defensive weapon, the underhook
Drive the knee through in a straight line rather than cutting across to maintain pressure alignment
Maintain continuous connection between hip pressure and shoulder pressure throughout the entire pass
Use the opponent’s guard retention attempts as energy to accelerate your knee through their structure
Consolidate side control immediately after clearing the legs before opponent can re-guard

Prerequisites

What do you need before attempting Knee Through?

Top position in half guard with one leg trapped between opponent’s legs at knee or thigh level
Dominant crossface or shoulder pressure established across opponent’s face driving their head to the mat
Control of opponent’s near arm through wrist control, sleeve grip, or complete underhook denial
Hip positioned directly behind shoulder pressure to begin knee extraction with aligned force vector
Opponent’s far leg monitored or controlled to prevent full guard recovery during extraction

Execution Steps

How do you execute Knee Through step by step?

Establish crossface control: Secure a strong crossface across the opponent’s face using your near shoulder, driving their head away from you and pinning it to the mat. Your crossfacing arm can either underhook their far arm or post on the mat for base. This crossface is the anchor point for all subsequent movements and must remain heavy throughout the entire passing sequence.
Control near side arm: With your free hand, control the opponent’s near wrist or sleeve to prevent them from establishing an underhook. Alternatively, secure your own underhook first, completely denying their primary defensive frame. This arm control is critical because the underhook is the half guard player’s most powerful defensive and offensive weapon, enabling sweeps and back takes.
Align hip and shoulder pressure: Position your hips directly behind your shoulders, creating a straight line of pressure from shoulder through hip into the opponent’s chest and torso. Your trapped leg should be slightly externally rotated to begin creating space for knee extraction. Avoid allowing your hips to lag behind your shoulders, as this gap is immediately exploitable by the bottom player.
Drive knee forward and through: Begin driving the trapped knee forward in a straight line through the opponent’s guard structure, not across their body. The motion punches your knee directly toward the mat on the far side of the opponent’s body. Unlike the Knee Slice which cuts laterally, this drive is linear and relies on your aligned body weight to force the knee past their leg entanglement.
Clear the bottom leg: As your knee drives through, use small circular motions or a slight hop to clear your foot over the opponent’s bottom leg. Maintain constant forward pressure with your upper body so they cannot exploit this transitional moment to recover guard. Your shin may briefly drag across their thigh before clearing completely. Keep your weight committed forward throughout this phase.
Consolidate side control: Once your leg is free, immediately bring your knee to the mat and establish side control position. Your chest should drop directly onto their chest, crossface maintains its pressure, and your hips settle low against their hips before they can turn into you or initiate any escape sequence. Secure far arm control or establish an underhook to complete the positional consolidation.

Possible Outcomes

Result	Position	Probability
Success	Side Control	68%
Failure	Half Guard	20%
Counter	Half Guard	12%

Opponent Counters

How might your opponent counter Knee Through?

Opponent establishes underhook on near side and drives into you, creating space and threatening to come to knees (Effectiveness: High) - Your Response: Switch to Knee Slice Pass variation that accommodates their underhook, or fight to regain underhook control with a whizzer before continuing. If their underhook creates upward space, consider stepping over into mount. → Leads to Half Guard
Bottom player extends knee shield frame to create distance and prevent shoulder pressure from landing (Effectiveness: High) - Your Response: Address the knee shield first by driving it to the mat with your free hand or hip weight. Alternatively, transition to Long Step Pass to bypass the frame entirely by stepping around it. → Leads to Half Guard
Opponent hip escapes away from the pass direction, creating space for guard recovery or re-composition (Effectiveness: Medium) - Your Response: Follow their hip movement with your body, maintaining shoulder pressure throughout. Use their escape motion to accelerate your knee through as their hip escape actually opens the path for your knee. → Leads to Half Guard
Bottom player locks deep half guard as you attempt to extract your leg, diving underneath your base (Effectiveness: Medium) - Your Response: Abandon the Knee Through and address the Deep Half Guard position with a backstep or whizzer to free your leg. Do not continue driving forward as this feeds their sweep mechanics. → Leads to Half Guard
Opponent rolls to turtle position as you clear the legs, denying side control consolidation (Effectiveness: Low) - Your Response: Accept the turtle position and immediately attack with back takes, front headlock entries, or clock choke setups. Turtle is a worse position for them than half guard. → Leads to Side Control

Common Attacking Mistakes

What mistakes should you avoid when executing Knee Through?

1. Attempting to drive knee through before establishing sufficient shoulder pressure

Consequence: Opponent easily frames against your hips and prevents the pass, or recovers full guard through the space created by your movement
Correction: Prioritize crossface and shoulder pressure first. Your upper body controls should be locked in and heavy before any leg movement begins.

2. Allowing opponent to establish underhook during the pass

Consequence: Opponent uses underhook to create distance, come to their knees in dogfight, or execute sweeps
Correction: Maintain constant awareness of near side arm control. If you lose the underhook battle, stop the pass and address it immediately before continuing.

3. Driving knee at an angle instead of straight through

Consequence: Your leg cuts across their body instead of clearing, leaving you vulnerable to leg recapture, sweeps, or re-guard
Correction: Focus on driving your knee in a straight line toward the far side of the mat. Your knee should track forward, not laterally across their centerline.

4. Rising up on your base to extract the trapped leg

Consequence: Loss of pressure allows opponent to create frames, recover guard, insert butterfly hooks, or initiate escapes
Correction: Stay heavy and connected throughout the pass. Use hip rotation and small circular motions rather than lifting your body weight off the opponent.

5. Failing to consolidate side control immediately after clearing the legs

Consequence: Opponent recovers guard or escapes before you establish secure top position, wasting the entire pass
Correction: The pass is not complete until side control is fully established. Drop your weight and secure position instantly upon clearing the legs.

6. Neglecting far leg control during the pass

Consequence: Opponent uses far leg to recompose butterfly guard, insert a knee shield, or recover full closed guard
Correction: Monitor and control the far leg with your free hand or body positioning throughout the pass to prevent guard recovery attempts.

Training Progressions

How do you train Knee Through (Attacker)?

Phase 1: Static Position Work (Weeks 1-2) - Crossface and arm control mechanics Start in established half guard top position with partner holding light frames. Practice achieving dominant crossface and near arm control without attempting the pass. Focus on pressure distribution, maintaining connection, and denying the underhook.

Phase 2: Slow Motion Pass (Weeks 2-4) - Knee insertion and leg extraction mechanics Execute the complete Knee Through pass at 25% speed with cooperative partner. Emphasize proper hip-shoulder alignment, maintaining pressure while moving, and correct leg clearing mechanics. Partner provides light resistance only.

Phase 3: Progressive Resistance (Weeks 4-6) - Problem solving against defensive frames Partner actively attempts to prevent the pass using knee shields, hip escapes, and underhook attempts at 50-75% intensity. Practice adapting the technique to different defensive reactions and recognizing when to abort.

Phase 4: Combination Passing (Weeks 6-8) - Chaining with complementary passes Practice transitioning between Knee Through, Knee Slice, and Long Step Pass based on opponent’s reactions. Develop automatic flow between techniques rather than forcing a single passing option against effective defense.

Phase 5: Positional Sparring (Weeks 8-10) - Live application with full resistance Start from half guard top position and attempt to pass with full resistance. Reset and repeat multiple rounds. Bottom player works full defensive repertoire including underhooks, knee shields, and deep half entries.

Phase 6: Open Sparring Integration (Weeks 10+) - Technique recognition and timing in live rolling Apply Knee Through pass during regular training rolls when opportunities arise. Focus on recognizing the correct timing and positional conditions for this particular pass versus alternatives.

Safety Considerations

What are the safety concerns for Knee Through?

The Knee Through pass is a relatively safe technique for both practitioners when performed correctly. The primary safety concern is excessive crossface pressure on the opponent’s neck and jaw, which should be firm but controlled to avoid cervical strain. Avoid driving the crossface upward into the throat, keeping pressure lateral across the face instead. When extracting your leg, be mindful not to drag your shin forcefully across the opponent’s thigh or knee, which can cause bruising or ligament stress. If the pass is not working after two or three attempts, reset rather than forcing movement, as forcing can lead to awkward leg positions where knee injuries occur. Practitioners with existing knee injuries should communicate with their partner about controlling the extraction phase.

Knee Through Attacker

Outcomes