mainedojo

That's correct as far as I know. Anko Itosu developed the Pinans to introduce Karate to the Okinawan Public school system as the Naihanchi katas were deemed too difficult for the beginners. Pinan Sandan begins in Shorin-Ryu (matsubayashi) with a Right hand chest block in Cat stance.

I study Matsubayashi Shorin-Ryu. Pinan san dan or Pinan 3 uses mainly nekoashi-dachi (cat stance) Zenkutsu-dachi (forward stance) and Kosadashi-dach (no idea what it is in english:>)