Wudang tai chi
Wudang tai chi (Chinese: 武當太極拳) is the name of a system of tai chi that was developed by a Hong Kong-based tai chi master Cheng Tin Hung. While Cheng never claimed to be teaching any particular school of tai chi, his uncle was a disciple of the Wu-style tai chi, which may or may not have had some influence on his own approach to the art.