I'm training BJJ but my native language is not english. I tried translation but it didn't work as well.
So I'm wondering: what is a cross face? I see people mentioning this cross face position, when passing the guard.
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A crossface is a way to gain positional control of an opponent while working from side control (side control is also called cross side or side mount). The gist of it is that you are driving shoulder pressure into the chin of your opponent to mitigate his/her mobility. More specifically, using a crossface helps prevent your opponent from turning toward you so that they can either hip away from you or roll into you to initiate some sort of escape.
Here is a good visual reference:
Crossface has no translation in bjj. It is a position when you force the head of your opponent to one side using your forearm or shoulder on the face of him. This position could be from side control, half guard, back, mount and defense of take down.
Crossface is very common nowadays to protect the single leg. When your opponent attack your leg. Using the crossface to be able to escape from the take down.
TL;DR Nowaday BJJ is getting very well organized but the name of the positions still a problem. In few year I believe, BJJ will get better and will organize it. But BJJ keeps growing and every day appear new position.
There are names in Portugues/Japanese/Inglish with a really good explanation.
Also some names with the name of the person who introduce the position to BJJ.
And the worst scenario the names created inside the academies.