Leg LockTransitionBelt: purple+Risk: moderateADCCNo-GiSub-OnlyMMA
The Back-Step to Inside Sankaku is a dynamic transition from top 50/50 or outside ashi to a dominant inside sankaku (triangle) leg entanglement. This movement creates strong inside heel hook entries and neutralizes many of your opponent’s defensive options. Mastery of this transition is essential for advanced leg lockers, especially in no-gi and submission-only contexts.
Start
Top 50/50 or outside ashi
End
Inside sankaku
Prerequisites: Controlling 50/50 knee line · Outside ashi garami entry · Posting for base in leg entanglements · Back-step mechanics · Inside sankaku finishing mechanics
Steps
1
Establish Top Position in 50/50 or Outside Ashi
From top 50/50 or outside ashi, ensure your opponent’s knee line is controlled by pinching your knees and keeping your hips heavy; post on your near-side hand for balance.
2
Clear Opponent’s Far Leg
Use your far-side hand to C-grip and push their far knee away, creating space for your back-step; keep your chest angled slightly forward to prevent them from sitting up.
3
Initiate the Back-Step
Swing your far leg in a wide arc over their body, aiming to place your shin across their far hip while rotating your hips so your back faces their torso; post your hand for base if needed.
4
Thread Your Leg Deep
As your shin lands, thread your stepping leg’s knee deep to the mat, tucking your foot under their far thigh; your hips should now be facing away from their head, with your knee pointing up.
5
Sit to Inside Sankaku Position
Drop your hips to the mat, sitting back while maintaining knee pinch and keeping your opponent’s knee line trapped; your legs should form a triangle around their far leg (inside sankaku).
6
Lock the Triangle
Bring your free leg over your entangled leg’s ankle, locking a tight triangle (figure-four) with your knees pinched and your foot hidden under their far thigh.
7
Control Their Far Hip and Heel
Use your near-side arm to underhook or scoop their far hip, and your far-side hand to establish a tight heel hook grip (thumb-to-heel, palm-to-ribs) while keeping your head close to their knee.
8
Angle for Breaking Pressure
Rotate your torso toward their foot, keeping your knees tight and your hips close to their knee line to maximize breaking power and prevent their escape.
Key details most people miss
The back-step must be performed with your hips high and weight forward to prevent your opponent from inverting or pummeling their free leg inside.
Threading your knee deep under their thigh is critical to fully capturing their knee line and preventing them from slipping their leg out.
Pinching your knees tightly during the transition keeps their leg isolated and stops them from turning their knee outward to escape.
Locking the triangle before attacking the heel ensures your opponent cannot rotate or kick free during the finishing sequence.
Common mistakes
If you back-step with your hips too low, your opponent can invert and re-guard, nullifying the transition.
Failing to clear their far leg with your hand allows them to block your back-step and recover guard.
Not threading your knee deep enough leaves their knee line exposed, letting them slip their leg free.
Locking the triangle loosely allows your opponent to rotate or kick out, breaking your control.
Counters & responses
They try: Opponent frames and posts on your hip to block the back-step
You do: Switch to a knee-cut pass or use your free hand to clear their frame before re-attempting the back-step.
They try: Opponent inverts to recover guard as you back-step
You do: Keep your weight chest-heavy and hips high during the back-step, using your hand to post and block their inversion path.
They try: Opponent turns their knee outward to slip the knee line
You do: Pinch your knees tightly and immediately lock the triangle as soon as your leg threads through.
They try: Opponent grabs your far ankle to prevent the triangle lock
You do: Use your free hand to peel their grip or switch to a cross-ashi entanglement if necessary.
Drill prescription
6 rounds × 2 minutes; 50% resistance; alternate roles each round. Goal: 5 clean transitions to inside sankaku per round, with opponent actively attempting to block the back-step and slip the knee line.
How the masters teach it
Gordon Ryan
Emphasizes tight knee line control and seamless transition from top 50/50 to inside sankaku for high-percentage leg attacks.
Bernardo Faria BJJ Fanatics
John Danaher
Focuses on the back-step as a core entry to inside sankaku, integrating precise grip and angle cues to maximize control.