Open guard passing is a massive part of Sport Brazilian Jiu Jitsu (BJJ).
I can look a bit weird to the non-enthusiast.
The idea is to pass from standing/kneeling in front of your opponent, to a position ‘past’ their legs – side control, mount or scarf hold.
Here is a simple guard pass that works well
You can also grab both ankles and stick them over the guys head, if you can get hold of the ankles – this is one of the biggest battles – fighting for grips. You can’t do much without your “2-points of control” when training in a gi.
Lots of people step forwards in between the guy’s legs, and step the other leg out to the side like a groin stretch and work for a ‘knee cutter’ pass.
Here are some variations of open guard passes
And here’s 2 handsome devils drilling some guard passes