Cho U is a Taiwanese professional Go player. He currently ranks 6th in the most titles won by a Japanese professional; his NEC Cup win in 2011 put him past his teacher Rin Kaiho and Norimoto Yoda. Cho is the first player in history to have held five of the top seven major titles simultaneously with Iyama Yuta being the second. Cho U, Naoki Hane, Keigo Yamashita and Shinji Takao make up the group of players in Japan called the "Four Heavenly Kings". His wife is one of Japan's best female go professionals, Izumi Kobayashi, the great Kitani's granddaughter and daughter of Kobayashi Koichi.