Butterfly Guard to Williams Guard is a no-gi entry where the seated bottom player secures a deep overhook on the opponent’s arm and threads a figure-four shoulder lock, converting butterfly hook control into the joint-threatening Williams Guard.
Butterfly Guard to Williams Guard is the primary entry into the modern shoulder-lock guard popularized by Roy Williams, executed from a seated butterfly base in no-gi. The bottom player begins with butterfly hooks and a same-side overhook on the opponent’s arm, then collapses the elbow and threads a figure-four grip behind the opponent’s tricep to isolate the shoulder. As the figure-four locks, the guard transforms from a pure hook-and-sweep platform into a joint-control hub where the trapped shoulder dictates the opponent’s every reaction.
The entry works best when the opponent reaches in to control your collar, posts a hand on the mat to base, or drives forward to flatten your butterfly guard, because each of those actions feeds the arm you need into overhook range. By the time the shoulder lock is set, the opponent faces the Williams dilemma: defending the joint opens omoplatas and sweeps, while pursuing the pass deepens the submission. This makes the transition far more than a position change; it converts a neutral guard exchange into an immediate offensive threat.
Because Williams Guard relies on a shoulder lock rather than collar-and-sleeve grips, the butterfly entry is especially valuable in no-gi where grip-based guards lose retention. The seated butterfly posture provides the elevation and hip mobility needed to angle off, while the overhook supplies the pre-frame that becomes the figure-four. Practitioners who master this entry gain a reliable on-ramp into one of the most dynamic submission-driven guards in contemporary grappling.
From Position: Butterfly Guard (Bottom) Success Rate: 55%
Possible Outcomes
| Result | Position | Probability |
|---|---|---|
| Success | Williams Guard | 55% |
| Failure | Butterfly Guard | 30% |
| Counter | Butterfly Guard | 15% |
Attacker vs Defender
| Attacker | Defender | |
|---|---|---|
| Focus | Execute technique | Prevent or counter |
| Key Principles | Use an overhook as the pre-frame that becomes the figure-fou… | Treat a deep overhook plus the bottom player angling off as … |
| Options | 6 execution steps | 3 defensive options |
Playing as Attacker
Key Principles
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Use an overhook as the pre-frame that becomes the figure-four shoulder lock, not a separate grip you scramble for
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Let the opponent’s reaching, basing, or forward pressure feed their arm into overhook range rather than forcing it
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Collapse the opponent’s elbow toward your chest before threading the figure-four to shorten the lever and prevent posture
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Angle your hips away from the opponent’s free arm so they cannot establish the underhook that defeats the shoulder lock
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Keep at least one butterfly hook or leg frame active so a failed entry retains butterfly guard instead of a pass
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Complete the figure-four grip to your own wrist for a self-reinforcing lock that survives the opponent’s escape attempts
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Treat the shoulder lock as a control mechanism first, reading the opponent’s reaction before committing to a finish
Execution Steps
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Establish butterfly base and overhook: From seated butterfly guard with your hooks under the opponent’s thighs, secure a deep overhook on t…
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Bait the arm forward: Invite the opponent to commit the arm: let them reach for your collar or neck, post on the mat to de…
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Collapse the elbow: Pull the overhooked arm tight and drive their elbow down and across toward your own chest, shortenin…
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Thread the figure-four: Pass your free hand under or behind the opponent’s collapsed arm and grip your own opposite wrist, c…
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Angle the hips off: Shrimp and rotate your hips away from the opponent’s free arm, turning your controlled-arm side towa…
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Settle into Williams Guard control: Confirm the shoulder-lock pressure is live by elevating the opponent’s elbow slightly and feeling th…
Common Mistakes
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Reaching for the figure-four while the opponent’s arm is still straight
- Consequence: A straight arm slides out of the shoulder lock easily, so the opponent extracts the limb and you lose both the overhook and your offensive position
- Correction: Always collapse the elbow toward your chest first to shorten the lever, then thread the figure-four only once the arm is folded and the shoulder is isolated
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Letting your head drift onto the centerline while setting the overhook
- Consequence: Your exposed neck invites a guillotine or front headlock counter that flips the exchange against you
- Correction: Keep your head off the centerline and to the outside of the controlled arm throughout the entry, protecting the neck while you build the lock
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Killing both butterfly hooks to commit fully to the arm
- Consequence: With no active hooks or frames, a denied shoulder lock leaves you flat and immediately passable
- Correction: Maintain at least one hook or a leg frame the entire time so a failed entry simply retains butterfly guard rather than conceding the pass
Playing as Defender
Key Principles
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Treat a deep overhook plus the bottom player angling off as the primary warning that a shoulder-lock entry is starting
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Prevent the entry by keeping good posture and refusing to feed a straight arm across the opponent’s centerline
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Fight the overhook early, before the elbow is collapsed and the figure-four can be threaded
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If the arm is wrapped, retract the elbow straight back toward your own hip rather than circling it into the lock
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Use a strong free-arm underhook and forward chest pressure to deny the hip angle the shoulder lock needs
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Stay heavy on the butterfly hooks so that defending the arm also progresses toward a guard pass
Recognition Cues
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The bottom player secures a deep overhook on one of your arms and pins your upper arm tight against their ribcage
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You feel your elbow being pulled down and across toward the bottom player’s chest, shortening and folding your arm
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The bottom player begins shrimping and angling their hips away from your free arm while keeping the wrapped arm trapped
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A free hand from the bottom player starts threading behind your upper arm to reach for their own wrist (the figure-four closing)
Defensive Options
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Strip the overhook and re-posture before the elbow is collapsed - When: Earliest stage — the moment you feel a deep overhook secured but before your elbow has been folded toward their chest
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Straighten and retract the trapped elbow back toward your own hip - When: Mid-entry — the overhook is deep and your elbow is bending, but the figure-four has not yet locked
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Dig a deep free-arm underhook and drive forward to flatten the hooks - When: When the shoulder lock is partially set but you still have a free arm and forward base available
Position Integration
This transition is the main gateway from the butterfly guard family into the Williams Guard system, bridging hook-based sweeping with shoulder-lock submission control. It sits alongside other butterfly arm-isolation entries such as the Kimura and Omoplata, sharing the same overhook setup but committing to a figure-four shoulder lock instead of a finishing crank. Strategically it lets a butterfly player escalate a neutral exchange into a submission-threat hub, and it integrates downstream with omoplata sweeps, triangles, and back-takes that flow from a defended shoulder lock. For no-gi guard players it provides a grip-independent path to a retention-and-attack platform when collar-and-sleeve options are unavailable.