The Go(Baduk) tournament is promoted by press or broadcasting or internet sites and managed by Korea Baduk Association and sponsored by corporations. Legal basis of tournament is three-parties contract among them. The interests of three parties collide sometimes. Promoters have interest in raising the goodwill of their brands. The manager seeks to get commission as the price of management, which is the main source of profit of the Association. The sponsoring corporations who burden the full cost of tournament, wants to use it as the effective opportunity of advertising. This article analyzes the rights and duties of three parties on the basis of contract, which will contribute to stabilize the management of tournament and to enlarge its market.