The Rohai (鷺牌) originated from the Tomari-te school of Okinawan martial arts. It was called Matsumora Rōhai, after Kosaku Matsumora, who was presumably its inventor. Master Itosu later took this kata and developed three kata from it: Rohai shodan, Rohai nidan, and Rohai sandan. In Shitoryu beside “Matsumora ha Rohai, also precise all these three katas from Master Itosu Anko school.
Itosu Rohai Shodan has different way of standing of “Sagi Ashi Dachi” which refers to its application of “Nami Gaeshi”. Itosu no Rohai Shodan is a short kata and it’s Embusen is a straight line.