Abstract This chapter presents a developed fuzzy ontology model for computer Go applica- tions. Unlike previous research, this chapter employs features derived from professional Go players' domain knowledge to transform them into the opening book sequence and to repre- sent them by a fuzzy ontology for the game of Go. Afterward, the domain experts validate the built fuzzy ontology. The developed fuzzy ontology has been verified through the invited games for Go programs playing against human Go players. The results show that the fuzzy ontology can work for computer Go application.