Yang Shao-Hou Tai Chi Chuan via Gu Li-Sheng, the 1st route (of 6 routes).
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Dan-Qiu is a second generation Taijiquan disciple of Grand Master Yang Shao-Hou (Dan-Qiu started his Taijiquan/Tai Chi Ch'uan training under the tutelage of Gu Li-Sheng in 1966).