B370 done before a Pin
GURPS Martial Arts: Technical Grappling pg 19 changes it so it is no longer a specific move but instead a category of other moves:
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Anaraxes: Just read the takedown rule as "only on a foe not on the ground*" rather than "only on a standing foe", and the problem goes away.
Kromm: This. We more or less assume it in GURPS Martial Arts.
Zedlopez: is there any reason you couldn't stalemate someone trying to pin you by Changing Posture to Kneeling after each time you're taken down, other than the fact that a stalemate does nothing to change your being grappled and in a vulnerable situation?
Kromm: Nothing prevents that. This is one of many problems that GURPS Martial Arts: Technical Grappling attempts to rectify. Without those rules, the puzzle is that there's no way to prevent somebody from taking a Change Posture maneuver unless you've pinned them.