 Complete the following phrase:  Lee Sedol ; born 2 March 1983, or Lee Se-dol, is a former South Korean professional Go player of 9 dan rank. As of February 2016, he ranked second in international titles 18, behind only Lee Chang-ho 21. He is the fifth youngest 12 years 4 months to become a professional Go player in South Korean history behind Cho Hun-hyun 9 years 7 months, Lee Chang-ho 11 years 1 months, Cho Hye-yeon 11 years 10 months and Choi Cheol-han 12 years 2 months. His nickname is The Strong Stone Ssen-dol. In March 2016, he played a notable 