is a Japanese professional shogi player, ranked 6-dan. Promotion history Sakaguchi's promotion history is as follows: 6-kyū: 1991 1-dan: 1996 4-dan: October 1, 2004 5-dan: December 8, 2009 6-dan: July 19, 2018 References External links ShogiHub: Professional Player Info · Sakaguchi, Satoru Japanese shogi players Living people Professional shogi players Professional shogi players from Osaka Prefecture 1978 births People from Takaishi, Osaka