Ude-hishigi-hara-gatame
(stomach armlock)

"Tori with his left hand, palm placed on the outer surface of uke's gi, seizes Uke's left wrist with his right hand, the palm also flat on Uke's arm. Tori pulls Uke's wrist as far as possible towards his left; and at the same time with his right hand and forearm, presses on Uke's elbow and triceps. Uke's left arm is blocked by Tori's abdomen. Tori keeps his upper body upright, and applies preasure to his right forearm onUke's left triceps. At the same time Tori's left arm pulls Uke's left wrist upwards, and maintaining contact with Uke's arm his own abdomen at all times."