I was briefly exposed to Yaw Yan ten years ago while I was in college. Although the techniques are similar there are some distinct differences. Yaw yan practitioners often pivot on the heel. There are some strange kicks not found in muay thai: scorpion kick, scorpion chop and the yaw yan back kick, a rear leg back kick that is done without spinning. they train on a 4x4 wrapped with twine and covered by rubber cement. Try this website
http://www.geocities.com/Colosseum/M...17/yawyan.html
the art also has hand strikes based on stick movements, bolo punches. I think there might be a school in Virginia but otherwise the philippines is the only place you can see it.