Early life and becoming a women's shogi professional
Ōshima was born in
Hiroshima, Japan on January 31, 2003.[2] She learned how to play shogi from her father.[2]
Ōshima entered the
Japan Shogi Association's
training group system under the guidance of shogi professional
Nobuo Mori [
ja].[2] She satisfied the
criteria for the
rank of women's professional 2-kyū upon obtaining promotion to Training Group B2.[3] She petitioned the
JSA to be allowed to become a women's professional, and the JSA announced that she would be awarded women's professional status and the rank of 2-kyū on April 30, 2021.[2]
Women's shogi professional
In March 2024, Ōshima defeated
Keika Kitamura in the finals of the 17th
Women's Mynavi Open [
ja] challenger tournament to earn the right to challenge
Tomoka Nishiyama for the Jo-Ō title;[4] Oshima's first appearance in a major title match, however, was unsuccessful as she lost the best-of-five title match (April 2024 – May 2024) against Nishiyama 3 games to 0.[5]
Notes: 1. No symbol denotes
JSA affiliation 2. An asterisk (*) denotes
LPSA affiliation 3. A cross (†) denotes unaffiliated. 4, A two-barred cross (‡) denotes a
JSA apprentice school player.
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