Digging Under The Chin - Back Control Basics Part 12
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Chin Tuck Defence·RVV BJJ
Digging under the chin of your opponent can be very difficult if they are adept at defending the back. Here are some ti…
Chin Tuck Defence
SubFamilyチンタックディフェンス(Chin Takku Difensu)
TransliterationTranslation: chin tuck defence
Overview
The Chin Tuck Defence subfamily covers the defensive technique of pulling the chin tight to the chest, creating a barrier of bone and muscle that prevents the opponent from accessing the neck for choking attacks. [1] The chin tuck works by eliminating the space between the chin and chest that the attacker needs to thread their arm or forearm across the throat. [1],[2] While the chin tuck is effective as an initial defence, it is considered a temporary measure — skilled attackers can work around the chin tuck by prying the chin up or attacking from alternative angles. [2],[3]
History & Origin
Effectiveness
Chin tucking prevents choke entries by protecting the neck with the chin. [1]
Lineage
Chin tucking is the most basic choke defence. [1]
Competition Record
Used in all grappling competition. [1]
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Biomechanical Mechanism
Primary Action — Using foot positioning to control range and angles — maintaining optimal distance relative to the opponent
Joints Involved — Ankles (pivot and directional changes), knees (level maintenance), hips (balance and weight distribution)
Force Vector — Multi-directional — lateral steps, pivots, and retreats adjust distance and angle simultaneously
Distance Principle — Managing the distance between fighters is the most fundamental defensive skill — controlling range dictates which techniques are available
Position & Entry
From fighting stance (under fire) — Bring both hands to the head, elbows tight, tuck the chin — absorb the flurry while protecting vital targets
As emergency defence — When overwhelmed by volume, shell up in the cover position until the opponent pauses
Videos
1 video
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Ratings
Risk of injury to the person this technique is applied to
3
Moderate3/10
Submission defence involves resisting joint locks/chokes; risk of injury if defence fails or is delayed
Skill level needed to execute this technique reliably
Intermediate
Whether this technique is allowed under major competition rule sets
— Unified MMA — Legal defensive technique
Unified Rules of MMA, August 2025PDF— IBJJF — Legal — defensive techniques are fundamental to g...
IBJJF Rules Book v6.0, June 2024PDF— IJF — Legal defensive action
IJF Sport and Organisation Rules 2025, Article 27PDF— ADCC — Legal
ADCC Rules Update, April 2025PDF— UWW — Legal defensive technique
UWW International Wrestling Rules, January 2026PDF— FIAS Sport Sambo — Legal
FIAS International Sambo Competition RulesPDFTraining Notes
✓The chin tuck is the instinctive and fundamental choke defence — tucking the chin to the chest blocks the opponent's arm from sliding under the chin to compress the arteries (Danaher, Back Attacks, 2018)
✓The chin tuck is a delay tactic, not a complete defence — it buys precious seconds to fight the hands and escape
✓Tuck the chin firmly to the chest and press your jaw down — the opponent must now pry the chin up before applying the choke
✓While the chin is tucked, use both hands to fight the opponent's grip — two-on-one the choking hand
✓The chin tuck works against all chokes that require under-chin access: rear naked choke, guillotine, arm-in chokes
✓Strengthen the neck specifically for chin-tuck endurance — neck curls and wrestler's bridges develop the muscles used
✓In gi, the chin tuck is less effective because collar chokes don't need under-chin access — they compress through the collar
Common Mistakes
!Relying solely on the chin tuck without fighting the hands — a strong opponent will eventually pry the chin up; you must actively hand-fight
!Tucking the chin but leaving the sides of the neck exposed — the jaw must press firmly to the sternum, not just angle downward
!Holding the chin tuck statically without working to escape — the chin tuck is temporary; use the time it buys to improve position
!Tensing the entire body during the chin tuck — relax everything except the neck and jaw; whole-body tension wastes energy
!Forgetting that the chin tuck doesn't work against all chokes — arm triangles, darces, and collar chokes bypass the chin tuck
!Not training the chin tuck under realistic pressure — your training partner should actively try to pry the chin up
!Using the chin tuck as an excuse to not learn proper hand-fighting defence
Related Techniques
Counter Techniques
Setup Chain
1Anticipate the Attack — read the opponent's intention through body cues
2Execute Defence — apply the specific defensive technique with proper timing
3Recover Stance — return to a balanced fighting position immediately
4Counter or Disengage — capitalize on the opening or create safe distance
Sources & References
Primary Source
Boxing (Edwin Haislet, 1940)
1BookJiu-Jitsu University (Ribeiro, 2008)
Alias sources — [1] Jiu-Jitsu University (Ribeiro, 2008) [2] Fundamentals of Brazilian Jiu-Jitsu (Danaher, 2012) [3] Brazilian Jiu-Jitsu: Theory and Technique (Gracie, 2001)
2BookMastering Jujitsu (Gracie & Danaher, 2003)
Effectiveness sources — [1] 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] Jiu-Jitsu University (Ribeiro, 2008) [2] Fundamentals of Brazilian Jiu-Jitsu (Danaher, 2012) [3] Brazilian Jiu-Jitsu: Theory and Technique (Gracie, 2001)
5CitationMastering Jujitsu (Gracie & Danaher, 2003)
Effectiveness sources — [1] Mastering Jujitsu (Gracie & Danaher, 2003)
Community
Athletics
Requires
reaction speed, structural body mechanics, defensive awareness
Favours
quick reflexes and conditioned defensive surfaces
Key muscles
varies — forearms (blocking), legs (movement), core (stability)
Sub-techniques
Frequently Asked Questions
What's the most common mistake people make when attempting chin tuck defence?
Keeping the head up or failing to maintain proper head engagement with chest-to-back connection. If your head isn't engaged, your opponent can turn their head and recede, allowing them to fight back inside and regain range.
Where should I start the chin dig if my opponent is defending with a tight tuck?
Start up near the jawline underneath the ear rather than going straight under the chin, then follow the jaw line and dig aggressively underneath. Even if they keep their chin tucked, this angle allows you to slide underneath and access the softer neck area.
What positioning do I need to be in to execute the chin dig effectively?
You need one arm free to attack the neck—this happens when your opponent's arms are preoccupied grabbing at your legs. Turn to face your opponent so you can dig your chin and turn them away from you.
How does the Chin Tuck Defence work?
The Chin Tuck Defence subfamily covers the defensive technique of pulling the chin tight to the chest, creating a barrier of bone and muscle that prevents the opponent from accessing the neck for choking attacks. The chin tuck works by eliminating the space between the chin and chest that the attacker needs to thread their arm or forearm across the throat.
Where does the Chin Tuck Defence come from?
Chin tucking is the most instinctive defence against chokes and has been practised in every martial art that includes choking techniques since antiquity. Modern grappling emphasises that chin tucking alone is insufficient and must be combined with hand fighting and positional escape.
Is the Chin Tuck Defence legal in competition?
Unified MMA: legal — Legal defensive technique; IBJJF: legal — Legal — defensive techniques are fundamental to grappling; IJF: legal — Legal defensive action; ADCC: legal — Legal; UWW: legal — Legal defensive technique; FIAS Sport Sambo: legal — Legal
How dangerous is the Chin Tuck Defence?
Danger rating 3/10. Moderate — submission defence involves resisting joint locks/chokes; risk of injury if defence fails or is delayed
How do I set up the Chin Tuck Defence?
The standard setup chain: Anticipate the Attack → Execute Defence → Recover Stance → Counter or Disengage.
How do I defend against the Chin Tuck Defence?
Standard counters include: Timing — attack when the defence is recovering or between movements / Feint — use deception to create openings in the defensive structure / Angle Change — attack from an unexpected angle that the defence does not cover.
What are the variants of the Chin Tuck Defence?
Common variants: Standard defence (primary defensive technique from the most common position); Reactive defence (triggered by the opponent's attack, minimal movement for …); Proactive defence (anticipating the attack and positioning to neutralise it …); Counter defence (using the defensive movement to create an immediate count…).
How effective is the Chin Tuck Defence in competition?
Used in all grappling competition.
What are common mistakes when doing the Chin Tuck Defence?
Top errors to watch for: Relying solely on the chin tuck without fighting the hands — a strong opponent will eventually pry the chin up; you m… / Tucking the chin but leaving the sides of the neck exposed — the jaw must press firmly to the sternum, not just angle… / Holding the chin tuck statically without working to escape — the chin tuck is temporary; use the time it buys to impr… / Tensing the entire body during the chin tuck — relax everything except the neck and jaw; whole-body tension wastes en….
What are other names for the Chin Tuck Defence?
The Chin Tuck Defence is also known as Chin Takku Difensu, Chin Tuck, Chin Down Defence, Throat Protection.