Koyama Ryugo
(小山竜吾) Nihon Kiin Professional, 7p in 2020.
Koyama was born on 3 December 1966 in Kanagawa Prefecture.
Promotion history
Became professional shodan in 1988, 2 dan in 1989, 3 dan in 1991, 4 dan in 1993, 5 dan in 1994, 6 dan in 2001, and 7 dan in 2020 (130 wins, as of March 13).
Family
Son of Koyama Shizuo, husband of Koyama Terumi, and father of Koyama Kuya.
Nihon Ki'in profile
2024 the Authors,
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