The 3 Submissions Every Purple Belt Should Drill Before Brown — And Why 2 Of Them Aren't What You Think

The purple belt malaise is real. You've got the breadth – a solid grasp of your A-game, enough answers to avoid white belt traps, and some flashes of brilliance. But the progression feels like a grind, not a flow. You're told to "work your weaknesses," which often translates to adding more techniques to an already overflowing mental database. The problem isn't your breadth, it's your depth. You're not short on tools; you're short on understanding how to use the tools you already have to dismantle a truly resisting, experienced opponent.

[!TLDR] Purple belts often plateau by focusing on quantity over quality in their submission drilling; re-examining the mounted triangle, kimura as a positional lever, and the straight ankle lock as a system reveals crucial underlying principles of pressure, control, and chaining that are essential for progressing to brown.

This isn't about learning new submissions; it's about dissecting three fundamental ones that the average purple belt consistently under-drills, not for their obvious finish, but for the diagnostic lessons they provide. They expose critical gaps in your pressure, your positional control, and your ability to chain attacks. Master these principles, and brown belt becomes less about a new syllabus and more about a refined understanding of what you already know.

The Mounted Triangle: Not Just a Submission, It's a Pressure Test

The mounted triangle is often seen as a flashy, opportunistic submission from a dominant position. Most purple belts drill the mechanics: pin an arm, scoop the head, hip switch, lock the triangle. They get it in drilling, sometimes in rolling, and then struggle against opponents who recognize the threat early and defend. The common diagnosis is "you need to be faster," or "your opponent is too flexible." That's a misdiagnosis. The mounted triangle, when executed correctly, isn't just a submission; it's a multi-faceted examination of your mount pressure, your ability to break posture, and your understanding of dynamic weight distribution.

What you're missing is not speed, but the systemic breakdown of your opponent's frame before the lock. A truly effective mounted triangle, like those seen in Gordon Ryan's methodical approach to mount offense [^1], begins long before your leg swings over the head. It's about systematically removing frames, forcing reactions, and then punishing those reactions with impeccable weight distribution. Your first leg over isn't a commitment to the finish; it's a positional adjustment, creating an inescapable angle and trapping the head and arm. The pressure should be so overwhelming that the opponent's only option is to expose the arm or neck for other attacks, not just the triangle.

The mistake at purple belt is often treating the mounted triangle as a distinct, isolated submission rather than the natural culmination of overwhelming mount control. You try to force the lock, losing the very pressure that made the position viable. The actual battle for the mounted triangle is won in the details of the initial transition – securing the head and arm, ensuring the opponent's hips are pinned, and then leveraging your weight to maintain stability as you swing. If you're losing mount when attempting this, your hip control is insufficient, not your finishing mechanics.

The Kimura: From Submission to Positional Lever

Most purple belts know the kimura as a shoulder lock, primarily from side control or half guard. They drill the grip, the rotation, the finish. But a kimura grip, as taught by John Danaher in his "Enter the System" series [^2], is far more than just a submission hold. It's a foundational positional lever — a control mechanism that destabilizes an opponent's entire structure, opening pathways to the back, mount, and even advanced leg entanglements. This is where the "not what you think" aspect truly shines.

The common purple belt error is isolating the kimura grip to a submission attempt. You get the grip, you try to wrench the arm, and if it fails, you often lose the grip and the position. This is inefficient. Instead, consider the kimura grip as a superior two-on-one, giving you unparalleled control over the opponent's posture, base, and mobility. From side control, securing a kimura grip isn't just about bending the arm; it's about using that grip to flatten the opponent, strip their ability to frame, and then, crucially, to roll them towards their back for a seatbelt entry or to force a turtle that gives you immediate back access.

The deeper lesson here is about using a submission threat to achieve positional dominance. If you get a strong kimura grip from side control, your first priority shouldn't be the finish. It should be to use that grip to make your opponent's life miserable positionally. Drag them, turn them, prevent them from recovering guard. As soon as they react to save their arm, you transition. Renzo Gracie, a pioneer in applying kimura principles, often stressed that the true power of the grip lies in its control over the opponent's posture and balance, not just the shoulder joint itself. You can use it to pass guard, sweep from bottom, or even set up leg attacks.

The Straight Ankle Lock: An Entry to the Lower Body System

The straight ankle lock, or straight footlock, is a staple submission taught early in a grappler's journey. By purple belt, most have a decent understanding of the mechanics. Yet, how many purple belts have a system for it? More often, it's an opportunistic grab and pull, executed from half-guard or a broken open guard. This is fundamentally incomplete and why it's "not what you think." A true straight ankle lock attack, as developed by pioneers like Dean Lister [^3] and refined by specialists like Craig Jones [^4], is an entire lower body attacking system, not just a single tap.

The common purple belt error is neglecting the setup, the off-balancing, and the follow-ups. You grab the foot, bridge, and pull, hoping for a tap. Against a savvy blue belt, maybe. Against a brown or black belt, you're just giving them a chance to escape, reset, or counter. The effectiveness of the straight ankle lock lies in its ability to break your opponent's base and posture, forcing them to distribute their weight poorly, making them vulnerable to sweeps, positional transitions, and, ultimately, the submission.

The deeper lesson for the purple belt is to view the straight ankle lock as the entry point to a web of lower-body attacks. You don't just grab the foot; you control the leg line, you break the opponent's ability to base, and you threaten the ankle lock to force a reaction. That reaction, whether it's turning away, pulling the leg back, or trying to stand, then opens the door to heel hooks, knee bars, or sweeps that can take you to dominant positions. Lachlan Giles, in his comprehensive leg lock instructionals [^5], emphasizes breaking the opponent's posture and creating a "foot line" where the entire body's weight is loaded onto the ankle, rather than just pulling on the foot. The threat of the ankle lock becomes a powerful control mechanism, allowing you to cycle through various attacks without losing connection.

These three submissions, when understood beyond their surface-level mechanics, represent critical checkpoints for a purple belt aspiring to brown. The mounted triangle demands impeccable pressure and transitional control. The kimura demands an understanding of how to use a submission grip as a positional lever. The straight ankle lock demands a systemic approach to lower body attacks. Stop drilling these techniques in isolation. Start integrating them as diagnostic tools for your overall game, revealing and shoring up the fundamental weaknesses that are holding you back. Focus on the why and the how of the setup and control, not just the what of the finish. Do this, and the brown belt will find you.