Ashi gatame video
Info about "Ashi gatame video"
Ashi gatame (leg armlock) is one of the official 29 grappling techniques of Kodokan Judo. It is one of the joint techniques of the Kansetsu-waza list, one of the three grappling lists in Judo’s Katame-waza enumerating 29 grappling techniques. 
Tori places his left knee on the ground, raises his right knee, which contains Uke’s left arm from the outside; then with his left arm he seizes the inner surface of Uke’s left wrist, and with his right hand, above the inner surface of the forearm; he bends his right knee so as to wedge Uke’s arm in the popliteal hollow; and applies the lock by pulling Uke’s arm upward. 
From Wikipedia  and greenbankjudoclub.co.uk