Gennan's Masterpiece

March 1815. Edo, Japan. Long before he became Inoue Gennan Inseki, head of the Inoue house, the young professional known as Hattori Rittetsu was already locked in a fierce rivalry with Kadono Jowa, the future Honinbo Jowa and Meijin Godokoro. Their 21-game match of 1815 to 1816 was one of the defining contests of the Bunka era. This game, played on 7 and 12 March 1815 (Bunka 12), is widely remembered as Gennan's masterpiece against his irreconcilable rival: 223 moves, no komi, Black wins by four points.

Two Futures of Japanese Go

Rittetsu was a 4-dan prodigy of the Inoue school, still using his birth name before adoption into the house. Jowa was a 5-dan rising force in the Honinbo lineage, not yet Meijin but already feared for sharp fighting and political ambition. Their match was played at a time when rank, house politics, and board strength were inseparable. A single game could shift reputations that would echo for decades.

The Game

Rittetsu took Black and opened in classical fashion. Jowa answered with the patient, territorial style that would later define his reign. The middle game developed into a contest of frameworks: Black probing White's influence, White consolidating territory while keeping sente. Historians praise Rittetsu's timing and reading in this encounter as evidence that Gennan was already among the strongest players of his generation, even as a young 4-dan facing a senior opponent.

After 223 moves, Black held a four-point lead under the no-komi rules of the day. Jowa accepted defeat. The game became a touchstone in go literature: a masterpiece of Gennan's youth, cited alongside later classics in surveys of Edo-period play.

Legacy

Two decades later, Jowa and Gennan's houses would collide again in the Blood-Vomiting Game of 1835, when Gennan sent Akaboshi Intetsu as a proxy. But in 1815 the rivalry was still fought directly across the board, and this game stands as proof that Gennan could beat Jowa on even terms when his reading was at its sharpest.

Primary sources for this account include the CWI Amsterdam game archive (GoGoD-derived record, RE[B+4], 223 moves), VitWiki's famous games index, and historical records of the Jowa-Rittetsu 21-game match on Sensei's Library.