Knee on Belly
Also called: knee belly, knee on belly, knee on belly transition, knee on the belly, knee-on-belly position, kob
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The chapter
Knee on belly is a pin you take half standing: one shin across their belly nailing their hips to the mat, the other foot free on the floor. It holds less surface than side control but it pins the part that matters — hips that can't lift can't guard.
It's less a resting pin than a mobile one. Your weight rides the shin while the free foot keeps you light enough to float — across to north-south, up to mount, back down to side control — so the position is worth as much for where it lets you go as for where it holds them.
The submissions here are mostly punishments. The knee is uncomfortable enough that people react fast and carelessly — an elbow leaves the ribs to push, a shoulder turns to relieve pressure — and each of those reactions is one of the attacks below.
Playing top
Make the pin survivable before you attack it: shin glued to the near hip, base alive, and then let their reactions — the pushing arm, the turn — choose the submission.
Shin across the belly and glued to their near hip, free foot wide and live on the mat, head straight and posture tall — your weight goes through the shin, not through a foot they can reach.
WhenThe moment you arrive from side control or a pass, before any grip hunting. If the position can't survive their first bump and bridge, nothing else on this list happens.
As they turn onto their side to escape the knee, the top collar opens — dig the first grip deep, feed the second hand, and finish with the knee still pinning while they're sideways.
WhenThey turn onto their side. The turn that relieves the knee pressure is the same movement that serves you the collar — you don't chase it, you wait for it.
Their hands come up to shove your knee or chest and an elbow leaves their ribs — pin the wrist to the mat, backstep if you need the angle, and take the americana, kimura, or straight armbar.
WhenAny time an elbow drifts away from their body. Pushing on the knee is the single most common gift this position produces, and all three arm attacks start from the same pinned wrist.
Post your hands either side of their head, drop your hip to the mat, and slide the knee across their belly — knee on belly is the classic doorway into mount.
WhenTheir hands are busy defending the knee and the chokes. Pin the near hip as you slide, because the moment you commit across is exactly the moment they're waiting to turn.
Also worth knowing
- Darce when they punch the underhookWhenThey dive for the underhook to build up off the mat — meet the punching arm and lock under the armpit.
- Baseball bat chokeWhenGi, with your collar grips already set — come off the knee, crush their near arm, and spin around the pivot of your knee.
- Backstep to the saddleWhenThey turn on their side facing away and the top leg hikes up — backstep outside it and isolate the leg.
Why you keep failing here
“They get an underhook on my leg and come up on me.”
WhyThe knee floated with no weight in it and their hips came off the mat — the underhook is the one thing the bottom player is fighting for down there, because it works.
FixKeep real weight through the shin and their hips flat before you climb or reach; a lifted hip on their side is a free underhook on yours.
“People dive under my knee into deep half, or my free leg gets tangled.”
WhyYou left a gap when the knee stepped past their hip — space between your shin and their body is an invitation to shoot underneath it.
FixStep past the hip with no daylight and turn the knee out so their foot can't thread inside your legs on the way up.
“Every time I slide to mount, they turn under me and take my back.”
WhyYou committed the knee across with their near hip and shoulders free — turning on the side and feeding your leg between theirs is a rehearsed counter to exactly that moment.
FixFlatten the near hip and control the head before the slide, and if they beat you to the turn, settle back onto the pin instead of chasing the mount.
Your game
Where does Knee on Belly show up in your rolls?
Upload a roll or a match and the professor finds every knee on belly moment in your own footage, then coaches you through what went wrong — or just tell it what's going wrong and get pointed at the fix.
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The map
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