In November 1922, during a leisurely visit to Kyoto, Motobu happened to notice a fight show between experts in judo and boxing and appeared in the show without prior application, and with one thrashing he defeated his challenger, as Russian boxer.
同年11月、たまたま遊びに出かけていた京都で、本部はボクシング対柔道の興行試合に飛び入りで参戦し、相手のロシア人ボクサーを一撃のもとに倒した。