Hosaka Mayu4-dan

"A student of Kobayashi Koichi, promoted to 4-dan this year."

A student of Kobayashi Koichi, Honorary Kisei, promoted to 4-dan in 2026. Her husband is shogi player Sensaki Manabu 9-dan. Faces Okada Yumiko 6-dan in the Women's Honinbo preliminary on Oct 8.

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MIRUGO WATCH POINT

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Against Okada Yumiko 6-dan, watch how she firmly secures territory in the opening without giving the opponent a chance to attack.

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In the year of her promotion, I want to watch her show a veteran's pride. MIRUGO focuses on the solid, territory-taking style inherited from her teacher.

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PROFILE

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A 4-dan of the Nihon Ki-in Tokyo Main Branch, from Hyogo. Turned pro in 1990. A student of Kobayashi Koichi, Honorary Kisei, she turned pro in 1990 and was promoted to 4-dan in 2026. Faces Okada Yumiko 6-dan in Women's Honinbo Preliminary on Oct 8. Basic information and records are based on the Nihon Ki-in's official profile (checked 2026-10-05); the watching points are arranged for viewers by the MIRUGO editorial team.

Rank: 4-dan
Affiliation: Nihon Ki-in, Tokyo Main Branch
Hometown: Hyogo
Date of birth: 1969-10-20
Turned pro: 1990

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2026-10-08 Women's Honinbo Preliminary Black Okada Yumiko VS White Hosaka Mayu B+Res

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