yeah i know you cant in college wrestling. im talking events like grapplers quest and ADCC. i see in videos where people grab their opponents head w/ their arm to do a choke, but i never see them grab their head alone to do a choke. i dont mean full nelsons. i wish i knew more about grappling and id tell you the move i mean. i see it all the time in videos, they just tie up like that, the guy on top just grabs his opponents head and an arm and clinches them as hard as he can, but i never see him grab just the head, it seems like itd be a more efficient choke, but i wasnt sure if it was legal. then again, if you grab an arm with the head, then it takes that arm out of commission so he cant use it which is a good thing. i guess that is why they always have an arm with the head, so their opponent cant use it. idk though, im sure my grappling logic is terribly flawed.