S Mount Armbar
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S-Mount·MMA Leech
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S-Mount
SubFamilySマウント(S Maunto)
TransliterationTranslation: S-mount
Overview
The S-Mount subfamily covers the modified mount position where the top fighter swings one leg up alongside the opponent's head while keeping the other knee by the hip, creating an S-shaped body configuration that provides ideal armbar positioning. [1] The S-mount is specifically designed as a submission platform for the armbar — the leg by the head is in position to clamp over the face, and the hip positioning provides the correct angle for armbar execution. [1],[2] The S-mount represents one of the highest-percentage armbar set-up positions in grappling. [2],[3]
History & Origin
Effectiveness
The S-mount provides an optimal platform for armbar attacks from mount by positioning one knee near the opponent's head, creating the angle needed for armbar completion while maintaining mount control. [1] The position maximises the attacker's leverage for arm isolation while minimising escape opportunities. [2]
Lineage
S-mount positions the attacker with one leg under the opponent's head and the other controlling the hip, creating extreme armbar and choke opportunities; developed in advanced BJJ. [1]
Competition Record
S-mount is used at the highest levels of BJJ competition for armbar finishes. [1]
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Biomechanical Mechanism
Primary Action — Gravity-assisted top control — body weight pins the opponent's torso to the ground
Joints Involved — Attacker's hips (heavy base), knees (clamped for ride control), opponent's spine (pinned)
Force Vector — Downward — gravity plus active hip pressure maximises control and submission opportunities
Positional Mechanic — High mount raises the centre of gravity above the opponent's shoulder line, isolating their arms for attacks
Position & Entry
From guard pass completion — After passing the guard, establish mount by placing knees on either side of the opponent's torso
From sweep — Complete a sweep from guard and land directly in mount position on top
From side control (knee slide) — From side control, slide the knee across the opponent's belly and settle into mount
Videos
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Ratings
Risk of injury to the person this technique is applied to
3
Moderate3/10
Top positions enable pressure and striking; rib compression risk under heavy pressure
Skill level needed to execute this technique reliably
Intermediate
Whether this technique is allowed under major competition rule sets
— IBJJF — Legal, mount scores 4 points — highest-scoring po...
IBJJF Rules Book v6.0, June 2024PDF— ADCC — Legal, mount scores 2 points
ADCC Rules Update, April 2025PDF— Unified MMA — Legal dominant position
Unified Rules of MMA, August 2025PDF— UWW — Legal, back exposure scores points, pin ends match ...
UWW International Wrestling Rules, January 2026PDF— FIAS Sport Sambo — Legal, pin scores points
FIAS International Sambo Competition RulesPDFTraining Notes
✓S-mount positions one knee near the opponent's head and the other foot posted near their hip, with the top player's body forming an 'S' shape — it is the primary position for the mounted armbar (Danaher, Mount Attacks, 2020)
✓The S-mount isolates one arm: the near knee pins the opponent's head while the body angles to control the far arm
✓S-mount is the transition between high mount and the armbar: the position is achieved when one knee climbs past the head
✓The 'S' shape comes from the body position: the top player's torso curves from the opponent's head to their hip
✓From S-mount, the armbar is nearly guaranteed: the arm is isolated, the head is pinned, and the top player can fall back for the finish
✓S-mount also threatens the triangle: the leg near the head is already in position to lock a triangle choke
✓The mount-to-S-mount-to-armbar chain is the most reliable submission sequence in all of grappling
Common Mistakes
!Not pinning the head with the near knee — the knee must press against the opponent's head/ear to prevent escape
!Posting the far foot too far from the hip — the foot should be close for base and control
!Not isolating the arm before transitioning to the armbar — the arm must be controlled from S-mount before falling back
!Rushing from S-mount to the armbar — establish the S-mount control first
!Not using the S-mount as a control position — it can be held; the opponent has limited escape options
!Achieving S-mount but not maintaining the angle — the 'S' curve of the body must be maintained
!Not training the mount to S-mount transition — the climb from high mount to S-mount is a specific skill
Related Techniques
Counter Techniques
Setup Chain
1Pass the Guard — clear the opponent's legs to advance to this dominant position
2Settle Weight — distribute body weight to maintain heavy pressure
3Control Arms — manage the opponent's arms to prevent frames and escapes
4Threaten Submissions — attack to force defensive reactions and maintain dominance
Sources & References
Primary Source
Mastering Jujitsu (Renzo Gracie & John Danaher, 2003)
1BookJiu-Jitsu University (Ribeiro, 2008)
Alias sources — [1] IBJJF Rules (2024) [2] Jiu-Jitsu University (Ribeiro, 2008) [3] Mastering Jujitsu (Gracie & Danaher, 2003)
2BookBrazilian Jiu-Jitsu: Theory and Technique (Gracie & Gracie, 2001)
Effectiveness sources — [1] Jiu-Jitsu University (Ribeiro, 2008) [2] Mastering Jujitsu (Gracie & Danaher, 2003)
3OtherJapanese Combat Sports Katakana Convention
Standard katakana transliteration of Western martial arts terminology (外来語) — used in Japanese MMA, boxing, and BJJ communities
4CitationJiu-Jitsu University (Ribeiro, 2008)
Alias sources — [1] IBJJF Rules (2024) [2] Jiu-Jitsu University (Ribeiro, 2008) [3] Mastering Jujitsu (Gracie & Danaher, 2003)
5CitationBrazilian Jiu-Jitsu: Theory and Technique (Gracie & Gracie, 2001)
Effectiveness sources — [1] Jiu-Jitsu University (Ribeiro, 2008) [2] Mastering Jujitsu (Gracie & Danaher, 2003)
Community
Athletics
Requires
base stability, heavy hips, ride ability
Favours
heavier build with strong hips for pressure
Key muscles
hip adductors, core, glutes, quadriceps
Sub-techniques
Frequently Asked Questions
How do I use a choke threat to set up an S-mount armbar?
According to MMA Leech, start by threatening a choke and controlling the opponent's neck and shoulders. As you drop your forearm and elbow toward the mat with choke pressure, your opponent must defend by opening their arms—even slightly. This small opening is enough to begin isolating and extending their elbow, which you can exploit to transition into the armbar.
What should I do if my opponent is too tight and I can't fully drive their arm across their body?
MMA Leech explains that if you cannot push their arm all the way across, catch their elbow with your chest instead. Drive your chest behind their arm and use your body weight to apply pressure and separate it, then proceed with the leg positioning for the S-mount.
Why is head control important when transitioning to S-mount?
MMA Leech emphasizes that you must block your opponent's head to prevent them from moving around and driving their elbow back to the ground. Once you secure head control, you can bring your leg underneath their arm; if they defend tightly, you can switch to controlling their arm directly instead while maintaining the same goal of lifting and isolating it.
Where should the opponent's arm be positioned in the final S-mount position?
MMA Leech states that in the final S-mount position, the opponent's shoulder and arm should be trapped directly between your legs or in your crotch area, with close control to prevent escape.
How does the S-Mount work?
The S-Mount subfamily covers the modified mount position where the top fighter swings one leg up alongside the opponent's head while keeping the other knee by the hip, creating an S-shaped body configuration that provides ideal armbar positioning. The S-mount is specifically designed as a submission platform for the armbar — the leg by the head is in position to clamp over the face, and the hip positioning provides the correct angle for armbar execution.
Where does the S-Mount come from?
The S-mount was developed as a specialised mount variation for armbar attacks, refined by BJJ competitors who sought to create the optimal mount configuration for finishing armbars from the top. It is now a standard part of the mount armbar attack system.
Is the S-Mount legal in competition?
IBJJF: legal — Legal, mount scores 4 points — highest-scoring position; IJF: legal — Legal, osaekomi (pin) — 10-19 seconds scores waza-ari, 20 seconds scores ippon; ADCC: legal — Legal, mount scores 2 points; Unified MMA: legal — Legal dominant position; UWW: legal — Legal, back exposure scores points, pin ends match by fall; FIAS Sport Sambo: legal — Legal, pin scores points
How dangerous is the S-Mount?
Danger rating 3/10. Moderate — top positions enable pressure and striking; rib compression risk under heavy pressure
How do I set up the S-Mount?
The standard setup chain: Pass the Guard → Settle Weight → Control Arms → Threaten Submissions.
How do I defend against the S-Mount?
Standard counters include: Bridge (Upa) — explosive hip elevation to off-balance the top player / Elbow-Knee Escape (Shrimp) — create space by driving elbow to knee and hip-escaping / Frame — establish forearm frames to prevent the top player from settling weight.
What are the variants of the S-Mount?
Common variants: Low mount (hips heavy on the opponent's belly, grapevines in for sta…); High mount (knees under the armpits, arms isolated for submissions); S-mount (one knee high under the armpit, other leg across for arm …); Technical mount (one leg hooked, one knee posted, modified for back-take t…).
How effective is the S-Mount in competition?
S-mount is used at the highest levels of BJJ competition for armbar finishes.
What are common mistakes when doing the S-Mount?
Top errors to watch for: Not pinning the head with the near knee — the knee must press against the opponent's head/ear to prevent escape / Posting the far foot too far from the hip — the foot should be close for base and control / Not isolating the arm before transitioning to the armbar — the arm must be controlled from S-mount before falling back / Rushing from S-mount to the armbar — establish the S-mount control first.
What are other names for the S-Mount?
The S-Mount is also known as S Maunto, S-Mount, Technical Mount, Armbar Mount.