Yūsei Koga

Yūsei Koga (古賀 悠聖, Koga Yūsei, January 1, 2001) is a Japanese professional shogi player ranked 4-dan.

Yūsei Koga
Native name古賀悠聖
Born (2001-01-01) January 1, 2001
HometownFukuoka, Japan
NationalityJapanese
Career
Achieved professional statusOctober 1, 2020(2020-10-01) (aged 19)
Badge Number326
Rank4-dan
TeacherIsao Nakata (8-dan)
Websites
JSA profile page

Early life and education

Koga was born in Fukuoka, Japan on February 13, 1996.[1] He learned how to play shogi from his grandfather when he was about four years old.[2][3]

Shogi

Apprentice professional

Koga entered the Japan Shogi Association's apprentice school in September 2011 as a protegee of shogi professional Isao Nakata.[2][3] He was promoted to the rank of apprentice professional 3-dan in April 2017 and obtained full professional status and the rank of 4-dan after finishing third in the 67th 3-dan League (April 2020 – September 2020) with a record of 13 wins and 5 losses.[2][3][4][5] Although Koga's third place finish was not sufficient to earn him direct promotion to 4-dan, it was good enough to earn him a second promotion point which gave him the option to enter the professional ranks as a free class player. After consulting with his mentor Nakata, Koga decided he wanted to turn professional even if it meant starting in the Free Class.[2][3][lower-alpha 1]

Promotion history

The promotion history for Koga is as follows.[7]

  • 2017, April: 3-dan
  • 2020, October: 4-dan

Notes
  1. Koga earned his first promotion point in third place with a record of 13 wins and 5 losses in the 65th 3-dan League (April 2019 – September 2019).[3][6]

References
  1. "Kishi Dētabēsu: Koga Yūsei" 棋士データベース: 古賀悠聖 [Professional Shogi Player Database: Yūsei Koga] (in Japanese). Japan Shogi Association. Retrieved October 3, 2020.
  2. "Itō Takumi Toppu Tsūka, Tomita Seiya Shōdan Shōreikai Sandan Rīgu" 伊藤匠トップ通過, 冨田誠也昇段　奨励会三段リーグ [Apprentice professional 3-dan League: Takumi Itō finishes first, but Seiya Tomita also promoted.]. Nikkan Sports (in Japanese). September 26, 2020. Retrieved October 3, 2020.
  3. "Shin Yonden Tanjō no Oshirase" 新四段誕生のお知らせ [New 4-dans announced] (in Japanese). Japan Shogi Association. September 26, 2020. Retrieved October 3, 2020.
  4. "Tomita, Koga ga Shin Shōgi Kishi Nishiyama wa Josei Hatsu Nogasu" 冨田, 古賀が将棋棋士に 西山は女性初逃す [Tomita and Koga promoted to professional status; Nishiyama misses chance to be come first female to become regular professional.]. Tokyo Shimbun (in Japanese). Kyodo News. September 26, 2020. Retrieved October 3, 2020.
  5. "Dai Rokujūnanakai Shōreikai Sandan Rīgusen Nisennijūnen Shigatsu kara Nisennijūnen Kugatsu" 第67回奨励会三段リーグ戦 2020年4月～2020年9月 [67th apprentice school 3-dan league: April 2020 to September 2020] (in Japanese). Japan Shogi Association. 2020. Retrieved October 3, 2020.
  6. "Dai Rokujūgokai Shōreikai Sandan Rīgusen Nisenjūkyūnen Shigatsu kara Nisenjūkyūnen Kugatsu" 第65回奨励会三段リーグ戦 2019年4月～2019年9月 [65th apprentice school 3-dan league: April 2019 to September 2019] (in Japanese). Japan Shogi Association. 2019. Retrieved October 3, 2020.
  7. "Kishi Dētabēsu: Koga Yūsei Sōodan Rireki" 棋士データベース: 古賀悠聖 昇段履歴 [Professional Shogi Player Database: Yūsei Koga Promotion History] (in Japanese). Japan Shogi Association. Retrieved October 3, 2020.
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