There is a 9 Palace Post training method used in both Yin and Cheng styles,
But Cheng Ting Hua Called his Ba-Gua “ 9 Palace” Style. In this style the theories of the Ba-Gua and I Jing are closely related to all aspects of practice.
Liu Xing Han inherited this branch from Lu Bin.
Now Sun Si Jun Learned Directly from Cheng Yu Sheng and Liu Tzu Yang. Liu was a student of both Cheng Ting Hua and Cheng Tien Hua who was Cheng Yu Sheng’s father. The splits aspect I mentioned before is called “ The Extended Mud Step”.
Yeah the “extended mud step” is something else to see in action. Check out the pic of Sun Ji Zhun (spelling?) on the cover of the vid at http://www.plumflower.com/new_products.htm (he’s the guy in yellow. Scroll down most of the page). A friend of mine has this demonstration video. Sun’s gotta be the Original Rubber Band Man the way he steps and twists. But supposedly he really knows how to apply the style. You can see why Cheng Tinghua’s style was called “the Dragon form” too . . . all elastic and twining like a dragon.
I saw some demos of stuff Liu Xing Han taught and it seemed like it had a lot of xingyi energy and technique in it–different than Sun Ji Zhun. Just shows how bagua evolves.