kami-shiho-gatame
(upper four quarter)

"This is a very powerful hold and an excelent reason why you should never let an oponent get behind you.Once behind you if he applies the upper four quarter,you will not readily escape.
Your opponent is lying on his back,you have approached him from behind his head and are lying extended with your chest on his, your elbows pressing hard into his armpits,your hands holding his belt on either side.Your head is turned to one side and you are pressing down on him;your hips are on the ground.Your legs should be wide spread equally to either side so that his body and your legs together form a letter "Y".