American Go E-Journal

In our recent “Shusaku Number ” article (What’s Your “Shusaku Number?”), we mistakenly reported that Hoensha founder Honinbo Shuho faced Shusaku in four of the “Castle Games.” Shuho actually never had the chance to play in those matchups. However, records of 38 games between the two masters have been preserved. The oldest dates from 1850, when Shuho was just twelve years old; most notable is the ten-game series (jubango) that Shuho and Shusaku played in 1861. In that series, playing mostly Black with no komi, Shuho managed six victories and one tie. For more details including copious historical material and several commented game records, you can consult Invincible: The Games of Shusaku,  generally regarded as one of the most important go books to ever appear in English.
– Roy Laird