Roukishi

老棋士

A peculiar elderly man with gold teeth, initially spotted sitting outside the bookstore playing shogi. He notices Jin observing the foreign ships at sea and informs him that their presence is illegal. He then challenges Jin to a game of shogi, wagering Jin's life against a substantial sum of money. Midway through the match, he attempts to cheat at least once by kicking over the board, but Jin calls him out, having memorized the piece positions. Jin tries to exploit this to his advantage, only to be called out himself.

Spoiler