The Good Fight allows it at blue belt level if I read correctly:
BLUE AND PURPLE BELT SUBMISSIONS
- ALL GENERAL ILLEGAL SUBMISSIONS WILL APPLY EXCEPT:
Wrist locks of any kind are OK.
Any straight foot lock is OK.
Any straight ankle lock is OK.
Any straight leg lock or knee bar is OK.
NO twisting lower extremity leg locks are permitted.
Bicep slicers are OK.
Calf slicers and compression locks are OK.
Electric chair submissions are OK.
**Twister submissions are OK.
http://www.goodfighttournament.com/a...ive_rules.html