Yūsei Koga (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Yūsei Koga" in English language version.

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3,222^nd place

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81^st place

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1,461^st place

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1^st place

278^th place

1,565^th place

mainichi.jp

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.

"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.
"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.

"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.
"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.
"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 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.

"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.

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.