"Sangaku translated means triangular and
refers to the shape of the legs around the arm and head. The technique
is similar to "pillow-juji-gatame" with Tori's left
leg resting underneath Uke's head. However instead of trapping
Uke's left arm and shoulder Tori's right leg wraps directly round
Uke's neck. To secure the lock Tori places his right foot behind
his left knee and lifts his hips upwards.
If
you find it difficult to put your right foot behind your left
knee, a slight adjustment with your hips is necessary. First turn
your hips towards Uke's head. This should enable you to make sufficient
contact. Now turn your hips back square and you should find that
a strangle and armlock are applied simultaneously."
