Knee Slide from Flattened Half

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The Knee Slide from Flattened Half Guard is a high-percentage guard pass that capitalizes on the dominant upper body control already established when the bottom player has been flattened. Unlike a standard knee slice from active half guard, this variation begins from a position of significant advantage where the bottom player’s frames have been collapsed, their back is flat against the mat, and the top player maintains heavy crossface pressure. The primary technical challenge is extracting the trapped leg while maintaining the pressure that keeps the bottom player immobilized.

The pass works by creating an angular displacement of the knee across the bottom player’s thigh line while driving forward pressure through the crossface and chest. The top player shifts their hips toward the passing side, angles the trapped knee diagonally across the opponent’s body, and slides through the gap between the opponent’s legs. The critical detail is maintaining chest-to-chest contact throughout the movement. Any lift in pressure during the knee slide gives the bottom player the space they need to re-insert frames, recover knee shield, or initiate hip escapes that can stall or reverse the pass.

This technique occupies a strategic position in the pressure passing hierarchy. Once you have flattened your opponent in half guard, the knee slide becomes one of the most direct paths to completing the pass. It pairs naturally with crossface passes and underhook passes, creating a passing chain where defending one option opens another. Advanced practitioners use the knee slide threat to force defensive reactions that expose back takes or submission entries, making it a cornerstone technique for systematic top game development from half guard.

From Position: Flattened Half Guard (Top) Success Rate: 55%

Possible Outcomes

Result	Position	Probability
Success	Side Control	55%
Failure	Flattened Half Guard	30%
Counter	Half Guard	15%

Attacker vs Defender

	Attacker	Defender
Focus	Execute technique	Prevent or counter
Key Principles	Maintain chest-to-chest pressure throughout the entire knee …	Recognize the knee slide attempt early through hip displacem…
Options	7 execution steps	4 defensive options

Playing as Attacker

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Key Principles

• Maintain chest-to-chest pressure throughout the entire knee slide - any lift creates recovery space for the bottom player

• Create the passing angle through hip displacement before driving the knee across, rather than forcing the knee through direct resistance

• Drive the crossface deeper as you initiate the slide to compound pressure and prevent the bottom player from turning into the pass

• Use the free leg as a posting base and driving engine, not just passive support - push off the mat to generate forward momentum through the slide

• Time the knee slide with moments when the bottom player is breathing or managing pressure, not when they are actively defending

• Treat the knee slide as one option in a passing chain - if they defend the slide, immediately transition to crossface pass or back take

Execution Steps

• Confirm crossface and pressure: Before initiating the slide, verify that your crossface is driving their head away from the passing …

• Shift hips toward passing side: Begin displacing your hips laterally toward the side you intend to pass to. This creates the angular…

• Angle trapped knee diagonally: Rotate your trapped knee so it points diagonally across the opponent’s body toward the far hip rathe…

• Drive knee across thigh line: With the angle established, push off your free foot and drive your knee across the opponent’s thigh …

• Clear the hook and extend: As your knee clears the opponent’s thigh line, straighten your leg to fully extract from the half gu…

• Drop hips to seal position: Once the leg clears, immediately drop your hips to the mat on the far side to prevent the bottom pla…

• Consolidate to side control: Shift your crossface arm from the passing configuration to standard side control positioning. Slide …

Common Mistakes

• Lifting chest pressure to create space for the knee slide

  • Consequence: Bottom player immediately re-inserts frames, recovers knee shield, or initiates hip escapes that stall the pass
  • Correction: Keep your chest welded to their torso throughout the entire slide. The knee must travel under your body weight, not through space created by lifting. Drive forward and down as you slide, never up.

• Attempting to force the knee straight through the hook without creating an angle first

  • Consequence: The bottom player’s hook easily blocks the direct path, wasting energy and telegraphing your passing intention for future attempts
  • Correction: Always establish a lateral hip angle before driving the knee across. Shift your hips toward the passing side first, then drive the angled knee through the gap created by the angular displacement.

• Releasing or weakening the crossface during the knee slide

  • Consequence: Bottom player can now see the pass coming, turn their head toward you, and use their near arm to establish frames that block the completion
  • Correction: Increase crossface pressure as you initiate the slide. The crossface should get heavier during the pass, not lighter. Drive their head further away from the action as you commit to the knee extraction.

Playing as Defender

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Key Principles

• Recognize the knee slide attempt early through hip displacement cues and act before the knee begins its path across your thigh

• Prioritize blocking the knee path over fighting the upper body control - if the knee is stopped, the pass cannot complete regardless of crossface pressure

• Use the top player’s commitment to the slide as an opportunity - their weight transfer creates brief windows for hip escapes and frame recovery

• Never release the leg hook prematurely even while defending - it remains your last barrier against the completed pass

• Time your strongest defensive effort to coincide with the moment the top player shifts weight for the slide, when their base is most compromised

• If the knee slide has progressed past the point of no return, immediately transition to side control defense rather than wasting energy on futile half guard retention

Recognition Cues

• Top player shifts their hips laterally toward one side while maintaining crossface pressure, creating the angle needed for the knee to travel across your thigh line

• You feel increased downward pressure through the crossface arm as the top player loads their weight forward in preparation for the knee drive

• The trapped knee begins rotating from a straight-down position to a diagonal angle pointing across your body toward your far hip

• The top player’s free foot adjusts its posting position, digging toes into the mat on the far side to create driving force for the slide

• Brief increase in pressure through your chest as the top player settles their weight before committing to the extraction movement

Defensive Options

• Frame insertion on the sliding knee with near-side hand or forearm to block the path across your thigh line - When: At the first sign of hip displacement or knee angle change, before the slide momentum begins

• Hip escape and knee shield re-insertion timed with the top player’s forward weight commitment - When: When the top player commits weight to the slide and their pressure briefly shifts from your chest to their driving leg

• Underhook recovery and sweep threat to force the top player to abandon the passing sequence - When: When the top player’s weight shifts forward during the slide, momentarily reducing their base and leaving the far side vulnerable

Variations

Crossface-Driven Knee Slide: Emphasizes driving the crossface deep across the opponent’s neck before initiating the knee slide, using the crossface pressure to turn their body and create the angle for the knee to cut through. The crossface arm drives their head away while the chest follows, creating a natural lane for the knee. (When to use: When the bottom player’s head is still relatively centered and they maintain some ability to face you. The crossface-first approach eliminates their visibility and structural alignment before committing to the slide.)

Underhook Knee Slide: Uses an underhook on the far side arm instead of or in addition to the crossface to control the bottom player’s shoulder and prevent them from turning into the pass. The underhook lifts their far shoulder while the knee drives across, creating combined upper and lower body passing pressure. (When to use: When the bottom player keeps their near arm tight and protects against the crossface but leaves the far arm vulnerable. The underhook controls their rotation and prevents them from turning away during the slide.)

Hip Switch Knee Slide: Incorporates a rapid hip switch before the knee slide, where the top player momentarily shifts their hips to face the opposite direction before driving the knee through. This creates a change of angle that disrupts the bottom player’s defensive timing and opens a wider lane for the knee to pass through. (When to use: When the bottom player maintains a strong leg hook that resists direct knee sliding. The hip switch creates angular momentum that helps clear the hook before the bottom player can readjust their grip.)

Position Integration

The Knee Slide from Flattened Half Guard serves as the primary completion mechanism in the pressure passing system from half guard. It connects the flattening sequence (crossface establishment, frame collapse, pressure consolidation) to the terminal passing position of side control. Within the broader passing hierarchy, this technique sits downstream of initial half guard engagement and upstream of side control consolidation. It chains naturally with the crossface pass and underhook pass as alternative completions when the bottom player adjusts their defense, and it can be combined with back takes when the bottom player turns to prevent the slide. The technique also integrates with submission threats like the arm triangle and kimura that become available when the bottom player extends their arms to defend the pass.

Related Techniques

• Flattened Half Guard - Starting position where top player has established dominant flattening control

• Side Control - Primary target position achieved upon successful completion of the pass

• Half Guard - Position bottom player recovers to if knee slide is successfully defended and countered

• Complete Pass from Flattened Half - Alternative passing completion from the same starting position

• Cross Face Pass from Flattened Half - Complementary pass that chains with knee slide when defender adjusts

• Knee Shield Half Guard - Position bottom player attempts to recover during failed knee slide attempts

• Deep Half Guard - Counter-position bottom player may enter if top player lifts pressure during slide

• Back Control - Position accessible when bottom player turns away to prevent the knee slide

• Arm Triangle Setup - Submission entry available when defender extends arm to block the knee slide

• Deep Half Entry from Flattened - Counter-transition the bottom player may attempt during weight transfer