Here’s a vid of UFC veteran, Kendall Grove, tapping to a weird looking choke. What’s even better is that his grappling partner is a girl and probably weighs 100 lbs lighter. The video was shot in 2004
I’ve never seen a choke like that, it seems to start from the rubber guard. Here’s a vid, explaining a similar move, I guess it’s called the ninja choke. It looks like it can be pulled off easily if you get the move down because your opponent won’t see it coming: