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ding bao ti dan kua chan are 6 big opening methods/skills or liu da kai.

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I like the first clip the best.
it is a gem as commented by bajifreak.
the use of hip/kua is in harmony with the shoulder.
or rotation of both joints in sync was very well explained and demo.

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http://www.youtube.com/watch?v=eusXUQLiK38&mode=related&search=
8 basic postures:
- hitting and elbow push or huo da ding zhou.
- carrying the long spear or tuo qiang shi.
- penetrating enclose or chuan bao.
- circling enclose or quan bao.
- low kick or chuo ti.
- explosive elevation of fist and knee or pao ti.
- crossing hip or xie kua.
- entanglement or chan.

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