A version of sanchin used in Matsumura ha Seisan. This stance is longer than Sanchin-dachi, (one foot longer) but retains the same tension and inward rotation of the knees. It is the basis of the kata Matsumura ha Seisan. Seisan-dachi is very easy to configure while you are practicing kata. When you want to change the direction, you just need to pivot both feet at their same spot like you are standing in a square box.
