Iwao Washizu

An old man who had made a lot of money, and one of the most powerful people in the underground. After building up massive funds from shady dealings in Japan's post-war era, he uses this money to tempt people—especially young people—to bet their lives for the chance to win a large amount of money. He enjoys doing this, so a match between Akagi and Washizu was arranged. Washizu and Akagi played mahjong in an unusual way, of which Washizu calls "Washizu Mahjong" in which glass tiles replace most of the tiles that make the game different in many ways.

(Source: Wikipedia)