Seiyunchin is a very old
Chinese kata, and it's origins are probably in the Hsing-i internal system.
All of the movements are hand techniques with no kicks, a very unusual feature.
It is in the tiger series of katas. Seiyunchin may be thought of as an
earth fire kata. It starts with solid
rooted stances then exploded into fast movement only to return just as quickly
to the rooted stances.
One of the things unique in this kata is the direction
of movement. Normally in a shiko dachi we work at a 45 deg. angle to the front
leg. This kata includes working directly over the front leg to a 45 deg. angle
to a 90 deg. angle. This is the only kata in Goju that uses all three angles
in the same form. Opposite to Sanseru which follows a four directional pattern,
Seiyunchin works a four diagonal pattern.