K-Guard to 50/50 Heel Hook from Closed Guard
Use this when the opponent postures up high to avoid the triangle. You cannot reach the upper body, so you attack the legs instead. The sequence works by pinning the knee to your chest in body-X, then threading your foot into the back of the knee as they try to escape. The pseudo-RNC grip on the heel keeps you connected during the transition to 50/50, where you finish with a heel hook.
10 steps
· save to drill into each- 1When the opponent postures up high, extract your knee down toward the floor to get into body-X position12:16
- 2Link your hands together around the opponent's leg12:21
- 3Pin the opponent's knee toward your chest using a gable grip, wrist-to-wrist, or ten-finger grip12:35
- 4Take your hand down to the base of the opponent's Achilles (toward the heel) and lock up a pseudo-rear-naked-choke grip12:57
- 5Kick your foot inside the back of the opponent's hamstring13:34
- 6If the opponent does nothing, extract your bottom leg as well to go into double 50/5013:44
- 7If the opponent backsteps early, press your foot into their stomach sideways to kick them away14:12
- 8Throw your secondary leg in to go into X-legs position14:29
- 9Take a climber's grip on the knee to prevent it from turning away14:36
- 10Come up on your elbow, take the dig, and internally rotate your hip for the heel hook finish15:25
From the source video

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Then the round started — and you forgot it.