 Complete the following phrase:  A doubles specialist, Yao and partner Sun Zhian captured the mens doubles title at the 1979 World Championships in Hangzhou run by the short-lived World Badminton Federation, a China-led organization then in competition with the older International Badminton Federation. When the political complaints against the International Badminton Federation were resolved, Yao and Sun won mens doubles at the 1981 World Games in Santa Clara, California, the first major IBF sanctioned tournament in which Chinas players participated. In 