Mental Model - The Circle of Competence: How Knowing Your Limits Makes You a Better Grappler

There's a moment that comes to every Brazilian Jiu-Jitsu practitioner, usually around blue or purple belt, where they realize something uncomfortable: they've been pretending to understand positions they don't actually understand.

Maybe it's that fancy berimbolo entry everyone's hitting in the gym. Maybe it's leg locks. Maybe it's something as fundamental as maintaining side control against a larger opponent. We drill it. We hit it occasionally. We tell ourselves we "know" it. But when the pressure's on, when we're rolling with someone skilled, the technique crumbles and we revert to what we actually know.

This gap between what we think we know and what we truly understand is where most of our frustration—and our defeats—live.

What Is Your Circle of Competence?

The circle of competence is a mental model that originated in the investment world, popularized by Warren Buffett and Charlie Munger. The concept is simple: you have a circle representing everything you genuinely understand at a deep level. Inside that circle, you can operate with confidence and make good decisions. Outside that circle, you're guessing.

The key insight isn't just knowing what's inside your circle. It's knowing where the boundary is.

In BJJ, your circle of competence might include the guard passes you can hit on anyone at your level, the submissions you finish consistently, the escapes you trust when you're exhausted. These are the techniques where you understand not just the mechanics but the timing, the setups, the variations, and the counters to the counters.

Everything else—the moves you kind of know, the positions you're still figuring out, the techniques you saw on YouTube last week—that's outside your circle. And here's what matters: operating outside your circle is expensive.

The Cost of Overconfidence on the Mats

When you attempt techniques outside your circle of competence, you pay for it immediately. You give up position. You get swept. You get submitted. In competition, these mistakes end your match. In the gym, they create bad habits and false beliefs about what works.

I've watched countless training sessions where a blue belt tries to pull off some elaborate flying armbar they saw on Instagram, only to land flat on their back in their opponent's side control. Meanwhile, the fundamentals they actually know—a simple closed guard break, a basic pass, solid pressure—sit unused.

The overconfident grappler has a tell: they start scrambling the moment things don't go according to plan. They don't have the depth of understanding to adjust, to troubleshoot, to work through resistance. They knew the choreography but not the principle.

Compare this to the competitor who operates ruthlessly within their circle. They might only have five guard passes, but they know those five passes so deeply that they can chain them together, recognize which one will work based on their opponent's reactions, and adjust mid-motion when something doesn't feel right. They're not more talented. They're just honest about what they actually know.

Ruthless Efficiency: Playing Your Game

Operating within your circle of competence means being disciplined enough to play your game even when it's not the exciting game, even when everyone else is working on something flashier.

If you have a killer cross-collar choke from closed guard, you hunt for that choke. You create the angles that set it up. You develop the guard retention that gets you back to closed guard. You build an entire system around the techniques you truly understand.

This isn't conservative or boring. This is smart. Watch high-level competitors and you'll notice they have a clear game plan built around a small set of techniques they've mastered. Marcelo Garcia had his guillotines and x-guard. Roger Gracie had his cross-collar choke from mount. Gordon Ryan has his heel hooks and back attacks. They expanded their games over time, but they always operated from a foundation of genuine competence.

When you fight from your circle, you're making informed decisions. You know what works, what doesn't, and why. You can feel when a technique is there before you commit to it. You're not hoping—you're executing.

Deliberate Expansion: Growing Without Gambling

Here's what the circle of competence model doesn't say: stay in your comfort zone forever. The goal isn't to keep your circle small. It's to expand it deliberately, honestly, and systematically.

Deliberate expansion means choosing one technique or position at a time to truly master before moving on. It means drilling that position until you can hit it while tired, against resistance, against people who know it's coming.

This approach feels slower than trying to learn everything at once. But it's actually faster, because you're building real competence instead of surface-level familiarity. You're adding rooms to your house instead of sketching blueprints for mansions you'll never build.

Knowing the Boundary: Honest Self-Assessment

The hardest part of the circle of competence model is honest self-assessment. It requires asking uncomfortable questions: Can I actually do this technique against a resisting opponent? Do I understand why this works, or am I just copying movements? What happens when this doesn't work—do I know how to adjust?

A good test is the teaching test: if you can't explain a technique clearly to a beginner and troubleshoot their problems with it, you probably don't understand it well enough for it to be in your circle.

Another test is the tired test: can you hit this technique in the last round of a hard training session when you're exhausted and your opponent is fresh? The techniques that survive fatigue are the ones you truly know.

Be especially wary of techniques you hit occasionally against less-skilled opponents. That's not competence—that's opportunity. If it only works on people who don't know the defense, it's not in your circle yet.

The Meta-Skill: Recognizing When You're Outside Your Circle

Perhaps the most valuable skill is recognizing in real-time when you've wandered outside your circle. You feel it in that moment of uncertainty, that fraction of a second where you're not sure what to do next. That's the signal to retreat back to what you know, to reset, to return to your A-game.

The best grapplers I know have an almost instinctive sense of when they're in danger of making a mistake born from ignorance rather than circumstance. They feel themselves reaching for a technique they haven't truly mastered, and they pause. They simplify. They return to fundamentals.

This isn't weakness. This is wisdom.

Building Your Practice Around Your Circle

So how do you structure your training around this model?

First, take inventory. Write down the techniques you can hit consistently against skilled, resisting opponents. Be honest. This is your current circle.

Second, identify the boundary. What techniques are you working on but haven't mastered? What positions do you kind of understand but can't quite execute under pressure? This is your expansion zone.

Third, choose one area to expand deliberately. Not five areas. One. Commit to making that technique, position, or transition part of your core competence over the next few months.

Fourth, in your rolls, operate primarily from your circle. Hunt for your best techniques. Build your game around what you genuinely know. But in specific training or flow rolls, work deliberately on your expansion zone.

Fifth, reassess regularly. Every few months, take stock of what's moved from your expansion zone into your circle. Celebrate that growth, then choose the next area to develop.

The Long Game

BJJ is a decades-long practice. You have time to learn everything you want to learn. But you don't have time to learn everything at once, and you definitely don't have time to waste pretending you know things you don't.

The circle of competence model is ultimately about respect—respect for the complexity of the art, respect for your training partners, and respect for your own learning process. It's about building something real rather than something that looks impressive but collapses under pressure.

Know your boundaries. Operate ruthlessly within them. Expand them deliberately. This is how you build a game that actually works, how you develop genuine confidence, and how you progress from someone who knows a lot of techniques to someone who truly understands jiu-jitsu.

Your circle might be small today. That's fine. It will be larger tomorrow, as long as you're honest about where the boundary is and disciplined about how you expand it.

That's the path to mastery.

Frequently Asked Questions

What is the circle of competence in BJJ? The circle of competence is a mental model that defines the techniques and positions you genuinely understand at a deep level — not just the mechanics, but the timing, setups, variations, and counters. In BJJ, it's the difference between techniques you can execute under pressure against skilled opponents versus moves you've drilled but can't reliably apply when it counts.

How do I know if a technique is truly inside my circle of competence? Two reliable tests: the teaching test and the tired test. If you can't clearly explain a technique to a beginner and troubleshoot their problems with it, you don't understand it deeply enough. If you can't hit it in the last round when you're exhausted and your opponent is fresh, it's not genuinely yours yet. Techniques that only work on less-skilled opponents don't count — that's opportunity, not competence.

Doesn't staying within my circle hold back my development? No — it actually accelerates it. The goal isn't to keep your circle small but to expand it deliberately, one position or technique at a time. Surface-level familiarity with twenty moves develops slower than deep mastery of five, because real competence compounds. You're building rooms in a house rather than sketching blueprints you'll never build.

How many techniques should I focus on expanding at once? One. Choose one technique, position, or transition and commit to genuinely mastering it over the next few months before moving on. Trying to expand in multiple directions simultaneously is how practitioners end up with a wide but shallow game that crumbles under real pressure.

How do I structure my rolls around my circle of competence? In regular rolls, hunt your best techniques and play your actual game. In specific training or flow rolls, deliberately work your expansion zone. This separation lets you build honest confidence from what you know while still developing new skills — without the cost of gambling with your game in hard sparring.

Is a small circle of competence something to be embarrassed about? Not at all. Roger Gracie built one of the greatest competitive records in BJJ history largely on one submission — the cross-collar choke from mount. Marcelo Garcia dominated with guillotines and x-guard. Elite grapplers aren't defined by how many techniques they know, but by how deeply they know the ones they use. A small, honest circle beats a large, dishonest one every time.

If you’re ready to dive into the world of authentic Brazilian Jiu-Jitsu training, consider visiting The Jiu-Jitsu Foundry at 72-C, Jalan SS21/62, Damansara Utama, Petaling Jaya, WhatsApp 011-11510501. Embrace the challenge, improve your skills, and discover how Brazilian Jiu-Jitsu can transform your martial arts journey!

Be good!