CORRECT ANSWER = 1883-1936. (9 points)

The famous master Yang Chen-Fu has four sons. One of them, Yang Zhen-duo, has visited the United on several occasions recently. It was said that Yang Chen-Fu did not like Taijiquan when he was young, but began to practice at the age of twenty. After his father's death, he studied day and night to attain the high skills that he is famous for. The current Yang style forms that we know today were defined and regulated by him.