Straight Ankle Locks From 50-50
We have been doing a series in my advanced class this week on 50-50 (in gi, though it's basically the same). It's my first time working this position. A lot of our time was spent on a series of straight ankle locks (as in, wrap the ankle in your armpit, grab a kimura grip under his heel and over his shin, etc). I have heard often that straight ankle locks "never work", but they are one of the few leg locks that are legal at basically any competition, gi or no-gi, and they don't seem nearly as dangerous to practice with my team as heel hooks and knee bars.
If they could actually be decently high percentage, they would be worth adding to my competition game, but I don't want to waste my time for too long on a low-percentage move. Your thoughts? Does anyone here use a lot of straight ankle locks, or for that matter, does anyone have luck with some basic foot-locks in 50-50?