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Iwamoto was born in Masuda, Japan. During his childhood he spent several years in Busan, Korea, where he learnt Go from his father.
He returned to Japan to study Go, moved to Tokyo, and became a disciple of Hirose Heijiro 6-dan of Hoensha in 1913. He achieved 1-dan in 1917, and swiftly rose through the ranks. In 1924, when Nihon Ki-in was established, Iwamoto joined it and achieved 6-dan.
Iwamoto retired as a professional Go player and emigrated to Brazil as a coffee farmer in 1929. However, he came back to Japan and resumed his career of Go after the failure of this venture in 1931.
In 1935 he won the Oteai, the most important tournament in Japan at that time. In 1946 he took the Honinbo title from Hashimoto Utaro. Iwamoto defended the Honinbo title against Kitani Minoru in 1947. He achieved 9-dan in 1967, and had many disciples.
He returned to Japan to study Go, moved to Tokyo, and became a disciple of Hirose Heijiro 6-dan of Hoensha in 1913. He achieved 1-dan in 1917, and swiftly rose through the ranks. In 1924, when Nihon Ki-in was established, Iwamoto joined it and achieved 6-dan.
Iwamoto retired as a professional Go player and emigrated to Brazil as a coffee farmer in 1929. However, he came back to Japan and resumed his career of Go after the failure of this venture in 1931.
In 1935 he won the Oteai, the most important tournament in Japan at that time. In 1946 he took the Honinbo title from Hashimoto Utaro. Iwamoto defended the Honinbo title against Kitani Minoru in 1947. He achieved 9-dan in 1967, and had many disciples.
