Hon'inbō Shūsaku

Lore & Background

Shusaku was a Japanese professional Go player of the 19th century, born on the island of Innoshima near Onomichi in Hiroshima Prefecture. He was the son of a merchant and, after impressing the lord of Mihara Castle in a game, was sponsored to study under a priest of professional level. At age eight, he joined the Honinbō school in Edo, the most important Go institute in Japan, and received his first professional diploma in 1840. He rose steadily through the ranks, reaching four dan in 1844. In 1846, he played a famous game against the strong player Gennan Inseki, initially with a handicap of two stones, which was abandoned when Gennan found Shusaku too strong. They restarted with Shusaku playing black, and during the game a doctor noticed Gennan’s ears turning red after one of Shusaku’s moves, a sign of surprise. Shusaku won that game by two points. He was later made the official heir to the head of the Honinbō house, Honinbō Shuwa, and eventually reached seven dan. His defining characteristic was an undefeated streak of 19 consecutive wins in the annual castle games, earning him the nickname “Invincible.” He also played a 30-game match against Ōta Yūzo, which was tied at three games apiece before Shusaku pulled ahead; the series was adjourned after a long, fixed tie game saved Ōta from further loss. Shusaku is eponymously linked to the Shusaku opening, a method of playing the opening with black that he perfected and which dominated Go until the 1930s. He is posthumously venerated as one of only three “Go sages,” alongside Honinbō Dosaku and Honinbō Jowa. He died of cholera at age 33 after tending to patients in the Honinbō house during an epidemic.

Reader's Guide

Shusaku’s playing style is most famously associated with the Shusaku opening, a black-stone fuseki he perfected. This approach, which emphasized solid territorial development and strategic flexibility, became the dominant opening method in professional Go until the 1930s. His reputation as an invincible player stems from an undefeated streak of nineteen consecutive wins in the annual castle games, earning him the nickname “Invincible Shusaku.” He also engaged in a historic thirty-game match against his rival Ōta Yūzo, a series sponsored by a patron after other players debated who was strongest. Shusaku ultimately forced Ōta to take a handicap, cementing his status as the era’s top player aside from his teacher, Hon’inbō Shūwa. Despite his strength, Shusaku never played white against Shūwa out of respect, leaving their relative skill unclear. His posthumous veneration as a “Go sage” places him alongside only Hon’inbō Dosaku and Hon’inbō Jowa, though Jowa’s title was later revoked. In Japan, modern scholarship has produced a balanced view of Shusaku’s career, while Western sources remain sparse, leading to a somewhat inflated reputation abroad. He died at age thirty-three from cholera contracted while tending patients in the Hon’inbō house.

Did You Know?

• Shusaku was nicknamed 'Invincible' after earning a perfect score of 19 straight wins in the annual castle games.
• Only two other players have been given the title 'Go Sage': Honinbō Dosaku and Honinbo Jowa (whose title was later revoked).
• The 23rd game of his 30-game match with Ōta Yūzo lasted nearly 24 hours and ended in a tie.