Seiyunchin (制引戦) is the first "black belt kata" and has many unique and interesting aspects. There are no kicks; only hand techniques are used, such as back fist and elbow strikes. There are techniques to unbalance, such as leg sweeps, throws and close-quarter strikes.
The shikodachi stance is employed throughout, moving both diagonally and in straight lines.
The kanji characters used above mean respectively 'control,' 'pull' and 'fight,' and this is clearly seen in the opening, which begins slowly in a series of solid stances, drawing the opponent in and pulling down, before exploding into rapid strikes.