Yūsei Koga

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Yūsei Koga

From Wikipedia, the free encyclopedia

Yūsei Koga
Native name	古賀悠聖
Born	(2001-01-01) January 1, 2001 (age 23)
Hometown	Fukuoka, Japan
Career
Achieved professional status	October 1, 2020(2020-10-01) (aged 19)
Badge Number	326
Rank	6-dan
Teacher	Isao Nakata (8-dan)
Meijin class	B2
Ryūō class	6
Websites
JSA profile page

Yūsei Koga (古賀悠聖, Koga Yūsei, January 1, 2001) is a Japanese professional shogi player ranked 6-dan.

Early life and apprentice professional

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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]

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]^[a]

Shogi professional

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In September 2021, Koga was promoted to Meijin Class C2 after defeating Hirotaka Kajiura 7-dan to reach the finals of the 52nd Shinjin-Ō [ja] tournament. Koga's victory meant that he satisfied the criteria for promotion to Class C2 for the 80th Meijin League (April 2022 – March 2023).^[7]^[8]

Promotion history

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The promotion history for Koga is as follows.^[9]

6-kyū: September 2011
3-dan: April 2017
4-dan: October 1, 2020
5-dan: March 14, 2023
6-dan: March 5, 2024

Tsume Shogi Solving Competition

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In March 2024, Koga won the 21st Tsume Shogi Solving Competition. He finished with a score of 73 points out of a possible 100 to win the competition for the first time. The tournament had been last held in 2019, but was cancelled from 2020 to 2023 due to the COVID-19 pandemic. Sōta Fujii 8-crown title holder, who won the competition the last five times it was held, did not participate in the competition.^[10]

Notes

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^ 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

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^ "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.
^ ^a ^b ^c ^d "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.
^ ^a ^b ^c ^d ^e "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.
^ "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 become first female to become regular professional.]. Tokyo Shimbun (in Japanese). Kyodo News. September 26, 2020. Retrieved October 3, 2020.
^ "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.
^ "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.
^ "Koga Yūsei Yondan ga Kesshō Shinshutsu Hatashi Shīkyū Nikumi Shōkyū Furīkurasu kara Jūninme" 古賀悠聖四段が決勝進出果たしC級2組昇級フリークラスから10人目 [Yūsei Koga promoted to Meijin Class C2 from the Free Class after advancing to finals; he is the 10th professional to be promoted from Free Class.]. Nikkan Sports (in Japanese). September 8, 2021. Retrieved October 4, 2021.
^ "Koga Yūsei Yodan, Furīkurasu kara Shikyū Nikumi e Shōkyū" 古賀悠聖四段, フリークラスからC級2組へ昇級 [Yūsei Koga promoted to Class C2 from Free Class] (in Japanese). Japan Shogi Association. September 8, 2021. Retrieved October 4, 2021.
^ "Kishi Dētabēsu: Koga Yūsei Shōdan 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 April 5, 2024.
^ Maruyama, Susumu (March 31, 2024). "Tsumeshōgi Kaitō Senshuken Koga Rokudan ga Hatsu Yūshō Gorenpa no Fujii Meijin wa Fusanka" 詰将棋解答選手権古賀六段が初優勝 5連覇の藤井名人は不参加 [Tsume Shogi Solving Competition: Defending champion Sōta Fujii Meijin, who won the competition the last five times it has been held, decides not to participate]. Mainichi Shimbun (in Japanese). Archived from the original on April 1, 2024. Retrieved May 2, 2024.

External links

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ShogiHub: Professional Player Info · Koga, Yusei

Active professional shogi players

9-dan

8-dan

7-dan

6-dan

5-dan

4-dan

Current titleholders

Sōta Fujii (Ryūō, Meijin, Ōi, Ōza, Kiō, Ōshō and Kisei)
Takumi Itō (Eiō)

Lifetime titleholders

Awarded	Kōji Tanigawa (Meijin)
Qualifying	Yoshiharu Habu (Kiō, Kisei, Meijin, Ōi, Ōshō, Ōza and Ryūō) Toshiyuki Moriuchi (Meijin) Yasumitsu Satō (Kisei) Akira Watanabe (Kiō and Ryūō) Sōta Fujii (Kisei and Ōi)

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