Four Gates / SiMen Quan

[Cataphract]

Can somebody tell me more about this form? I've found it in the Southern Mantis and Southern Great Ancestor systems. There should also be a YongChun White Crane form by that name which I can't find.

TaiZu Xiao Si Men
https://www.youtube.com/watch?v=bUcBVukwZNQ

Southern Praying Mantis Say Mun Sau
https://www.youtube.com/watch?v=uYLY4jlMeGw
http://www.youtube.com/watch?v=7Kot9OSrvAM

Hakka Kuen 四門
http://www.tudou.com/programs/view/6qOJQvNZHr8

Fujian Luohan SiMen / SeiMun
https://www.youtube.com/watch?v=53EZkHu_Pho
https://www.youtube.com/watch?v=VNnJM1bUQOo

WingChun (Chan Wah Shun, Chan Yu Min lineage) SilLin SeiMun
https://www.youtube.com/watch?v=B1RlwzKAcnI

Hung Gar Sei Mun
https://www.youtube.com/watch?v=5l5FX8hj_fA

Pak Mei Sei Moon Baat Gwa Kuen
https://www.youtube.com/watch?v=WGr35kPHe-k

Choy Lee Fut 四門拳
https://www.youtube.com/watch?v=jcd7WgLY9Nw

Uechi Ryu Seisan
https://www.youtube.com/watch?v=TUCdg0hEy6Q

Chotoku Kyan Seisan
https://www.youtube.com/watch?v=z2xiW8dHc7o

GoJu Ryu Seisan
https://www.youtube.com/watch?v=LJeOCRV0oF0

Shotokan Hangetsu
https://www.youtube.com/watch?v=3gfKxxBnEcE

[Cataphract]

In Yunnan exists a form 來恆拳 (slow steady step?) or 四門十三拳 (four gates 13 fist?) that I can't find. Interesting. That might explain where the Seisan comes from.

[Cataphract]

Yue Jia Quan (Ying Men Quan) from Jiangxi is based on a Four Gates form. So maybe the Yue Jia is the source of the Four Gates. I had not luck finding a demonstration so far.

[gaoshou]

Are you a Karateka or a White Crane practitioner?

[Cataphract]

I'm a Karateka

[gaoshou]

Oh okay. Can I ask what style as you seem to have an interest in things White Crane in nature?