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Ryūō

From Wikipedia, the free encyclopedia

Ryūō (also Ryu-O, Ryu-oh, Ryuuou; in Japanese: 龍王りゅうおう, 竜王りゅうおう, lit. "Dragon King") is an annual Japanese professional shogi tournament and the title of its winner. The current Ryūō title holder is Sōta Fujii.

The Ryūō Tournament (Ryūō-sen 竜王りゅうおうせん) is sponsored by the Yomiuri Shimbun as well as the title awarded to its winner. It is one of the eight major professional shogi title matches and was first held in 1988. Among the eight titles in the professional shogi titleholder system, Ryūō and Meijin are the most prestigious ones. However, the Ryūō title gives out the highest monetary prize—even more than the Meijin title. Cash prizes are ¥44,000,000 for the winner of championship and new Ryūō titleholder,[1] and ¥16,500,000 for the loser.[2] Additional compensation includes ¥14,500,000 for the previous titleholder and ¥7,000,000 for the challenger.

This title should not be confused with that of Amateur Ryūō which is awarded each year to the winner of the Amateur Ryūō Tournament.

Name

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The dragon king

The basic meaning of ryūō is a "promoted rook". It can move as both a rook (hisha 飛車ひしゃ) and a silver (ginshō 銀将ぎんしょう) during a turn and is one of the two most powerful pieces in shogi.

Tournament structure

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The tournament consists of six class tournaments and one ladder-format challenger tournament. All currently active professional shogi players as well as qualifying women's professionals, apprentice professionals and amateurs are assigned to one of six classes. There are roughly 16 players each in Class 1 to Class 3, 32 players in Class 4 and Class 5, and then all remaining players are assigned to Class 6. The top players in these class tournaments (the top five players from Class 1, the top two from Class 2, and the top player from Class 3, Class 4, Class 5 and Class 6) are then seeded into the challenger tournament. The two players advancing to the final of the challenger tournament play a three-game match to determine the overall winner. In the title match, the first player to win four out of seven championship games becomes the new titleholder.[3]

History

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The Ryūō is a continuation of the earlier Tenth Dan (じゅうだんせん jū-dan sen) title tournament. The Tenth Dan (1962–1987) itself is a continuation of the Ninth Dan (九段くだんせん, 1956–1961) and the earlier 全日本ぜんにほん選手権せんしゅけんせん (1948–1955) tournaments, which were also sponsored by the same Yomiuri Shimbun. The 全日本ぜんにほん選手権せんしゅけん tournament became a title tournament in 1950, where the title was known as the Ninth Dan (きゅうだん) title. (At this time, the highest dan rank in shogi was 8-dan unlike the current ranking system.) Considering this lineage, the Ryūō is second historical title and the longest running title tournament apart from the Meijin title.[4]

Lifetime Ryūō

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"Lifetime Ryūō" (Eisei Ryūō) is the title awarded to a player who wins the championship five times in a row or seven times in total. Active players may qualify for this title, but it is only officially awarded upon their retirement or death.[5]

Only two players have qualified for the Lifetime Ryūō title: Akira Watanabe and Yoshiharu Habu. Watanabe qualified for the title by winning his fifth championship in a row in 2008 (he has also won the title eleven times),[6] whereas Habu qualified by winning his 7th title overall in 2017.[7] Both players will be officially designated Lifetime Ryūō upon retirement or death.

Winners

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The number in parentheses represents the cumulative times the player had won the title to date.

No. Year Winner Score Opponent
1 1988 Akira Shima 4-0 Kunio Yonenaga
2 1989 Yoshiharu Habu 4-3 Akira Shima
3 1990 Koji Tanigawa 4-1 Yoshiharu Habu
4 1991 Koji Tanigawa (2) 4-2 Taku Morishita
5 1992 Yoshiharu Habu (2) 4-3 Koji Tanigawa
6 1993 Yasumitsu Sato 4-2 Yoshiharu Habu
7 1994 Yoshiharu Habu (3) 4-2 Yasumitsu Sato
8 1995 Yoshiharu Habu (4) 4-2 Yasumitsu Sato
9 1996 Koji Tanigawa (3) 4-1 Yoshiharu Habu
10 1997 Koji Tanigawa (4) 4-0 Keiichi Sanada
11 1998 Takeshi Fujii 4-0 Koji Tanigawa
12 1999 Takeshi Fujii (2) 4-1 Daisuke Suzuki
13 2000 Takeshi Fujii (3) 4-3 Yoshiharu Habu
14 2001 Yoshiharu Habu (5) 4-1 Takeshi Fujii
15 2002 Yoshiharu Habu (6) 4-3 Takashi Abe
16 2003 Toshiyuki Moriuchi 4-0 Yoshiharu Habu
17 2004 Akira Watanabe 4-3 Toshiyuki Moriuchi
18 2005 Akira Watanabe (2) 4-0 Kazuki Kimura
19 2006 Akira Watanabe (3) 4-3 Yasumitsu Sato
20 2007 Akira Watanabe (4) 4-2 Yasumitsu Sato
21 2008 Akira Watanabe (5) 4-3 Yoshiharu Habu
22 2009 Akira Watanabe (6) 4-0 Toshiyuki Moriuchi
23 2010 Akira Watanabe (7) 4-2 Yoshiharu Habu
24 2011 Akira Watanabe (8) 4-1 Tadahisa Maruyama
25 2012 Akira Watanabe (9) 4-1 Tadahisa Maruyama
26 2013 Toshiyuki Moriuchi (2) 4-1 Akira Watanabe
27 2014 Tetsurō Itodani 4-1[8] Toshiyuki Moriuchi
28 2015 Akira Watanabe (10) 4-1[9] Tetsurō Itodani
29 2016 Akira Watanabe (11) 4-3[10][a] Tadahisa Maruyama
30 2017 Yoshiharu Habu (7) 4-1[11] Akira Watanabe
31 2018 Akihito Hirose 4-3[12][13] Yoshiharu Habu
32 2019 Masayuki Toyoshima 4-1[14] Akihito Hirose
33 2020 Masayuki Toyoshima (2) 4-1[15] Yoshiharu Habu
34 2021 Sōta Fujii 4-0[16][1] Masayuki Toyoshima
35 2022 Sōta Fujii (2) 4-2[17] Akihito Hirose
36 2023 Sota Fujii (3) 4-0[18] Takumi Itō

Records

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  • Most titles overall: Akira Watanabe, 11
  • Most consecutive titles: Akira Watanabe, 9 in a row (2004–2012)
  • Most times recapturing title: Yoshiharu Habu, 4[b]
  • Longest period between titles: Yoshiharu Habu, 15 years (2003–2017)
  • Oldest person to win title: Yoshiharu Habu, 47 years and 2 months[7]
  • Youngest person to win title: Yoshiharu Habu, 19 years and 2 months.[19]

Games played outside Japan

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The first game of each of the following Ryūō title matches was played outside of Japan.[20][21]

No. Year Location
3 1990 Frankfurt, Germany
4 1991 Bangkok, Thailand
5 1992 London, England
6 1993 Singapore
7 1994 Paris, France
8 1995 Beijing, China
9 1996 Los Angeles, United States[22]
10 1997 Gold Coast, Australia
No. Year Location
11 1998 New York City, United States
13 2000 Shanghai, China
15 2002 Taipei, Taiwan
17 2004 Seoul, South Korea
19 2006 San Francisco, United States[23]
21 2008 Paris, France
27 2014 Honolulu, United States[24]

29th Ryūō challenger controversy

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Hiroyuki Miura won the three-game challenger playoff match for the 29th Ryūō tournament by defeating Tadahisa Maruyama two games to one in early September 2016. Three days before Miura was to begin play against reigning Ryūō Akira Watanabe, however, the Japan Shogi Association (JSA) announced that Maruyama was replacing Miura as the challenger. The official reason given by the JSA had to do with Miura failing to follow proper procedure in requesting to be allowed to withdraw from the match, but there also had been suspicions raised about Miura's recent frequent leaving of his seat during official shogi games. Suspicions had been raised that he was doing so to consult shogi software or an app installed on a smartphone. Miura denied the accusations at a meeting of the JSA managing directors on October 11, and said he was withdrawing from the upcoming title match because he could not play shogi under such circumstances. The JSA said that Miura failed to submit an official notification of withdrawal by the required deadline on October 12 and as a result Miura was suspended from official game play until December 31, 2016.[25][26]

The JSA subsequently established an independent investigative panel at the end of October 2016 to determine whether Miura had actually done anything wrong and to evaluate the appropriateness of its response to the allegations.[27][28] The panel held a press conference on December 26, 2016 to announce its findings. The panel found there was insufficient evidence to support the accusations of cheating made against Miura and that the claim that he had excessively left his seat during official games was false. Regarding the action taken by the JSA, the panel stated that it believed that the JSA response was appropriate given the circumstances since it had no real option other than to act the way it did.[29] In response to the panel's report, both the JSA and Miura held separate press conferences. JSA president Koji Tanigawa apologized to Miura and announced he was being allowed to return to active status in January. Tanigawa also stated that he and three other executives of the JSA would have their salaries cut by 30% for a period of three months.[30] Miura criticized the JSA in his press conference and stated that "he wonders why the association banned him from participating in the Ryu-oh championship match since there was no evidence of wrongdoing" and that "he wants things to be settled as soon as possible and that he will try hard to get back to his winning ways".[31]

On January 18, 2017, Tanigawa announced that he was resigning as JSA president to assume responsibility for the JSA's handling of the matter.[32] The following day, the resignations of Tanigawa and Akira Shima, the director in charge of the JSA's handling of the Miura allegations, were accepted at an emergency meeting of the JSA's board of directors.[33]

On February 27, 2017, another emergency meeting of JSA professionals was held in response to a petition signed by 28 current and former professionals asking that the JSA remove five board members involved in the handling of the controversy. The meeting took place via teleconferencing at JSA offices in Tokyo and Osaka, and a vote was held to determine whether the five should be asked to step down. Out of the 234 voting members of the JSA, 216 votes (including 64 by written proxy) were cast and a majority voted for the dismissal of three of the five: Teruichi Aono, Daisuke Nakagawa and Daisuke Katagami.[34][35]

On May 24, 2017, Miura and new JSA president Yasumitsu Satō held a joint press conference to announce that a settlement had been reached to resolve any outstanding issues between the two sides. Both sides acknowledged their acceptance of the findings in the independent investigative panel's report and expressed their desire to move on from the matter. It was also announced that the JSA agreed to pay Miura an undisclosed financial settlement to compensate him for not only lost game fees, but also for the mental anguish and damage caused to his reputation. Miura also announced that he met with Ryūō title holder Watanabe prior to the press conference and that he accepted Watanabe's apology for his role in the controversy.[36][37]

Players by Ryūō class

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Below is a list of professional players grouped by their class for the 37th Ryūō league (2023–2024) including their dan ranking.[38][39] In addition to the regular professional players, current women's professional title holders Kana Satomi, Tomoka Nishiyama and Sae Itō as well as one other women's professional Momoko Katō, one apprentice professional 3-dan, and four qualifying amateur players also were assigned to Class 6.[40] Women's professional ranks are denoted by a "W" and apprentice professional ranks are denoted by an "A" before a player's dan ranking.

36th Ryūō
Name Dan Other titles
Sōta Fujii 9 Eiō, Kiō, Kisei, Meijin, Ōi, Ōshō, Ōza

Notes

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  1. ^ This 2016 tournament playoff was affected by the 29th Ryūō challenger controversy which prevented Hiroyuki Miura from challenging Watanabe.
  2. ^ Habu lost the title for first time in 1990, but won it back in 1992. He lost the title again in 1993, only to recapture it for the second time in 1994. He lost title for the third time in 1996, but recaptured it again five years later in 2001. He lost the title in 2003, but recaptured it for a fourth time in 2017.

References

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  1. ^ a b "Fujii wins shogi's Ryuo crown, youngest to hold 4 major titles". Mainichi Shimbun. November 13, 2021. Retrieved November 15, 2021.
  2. ^ "Ryūō Rankingusen・Kesshō Tōnamento ni tsuite" 竜王りゅうおうランキングせん決勝けっしょうトーナメントについて [About the Ryūō ranking leagues and championship tournament] (in Japanese). Japan Shogi Association. Retrieved November 15, 2021.
  3. ^ "Ryūōsen: Ryūō Rankigu Kesshō Tōnamento ni Tsuite" 竜王りゅうおうせん: 竜王りゅうおうランキングせん決勝けっしょうトーナメントについて [Ryūō Tournament: About the Ryūō Ranking Leagues and Challenger Tournament] (in Japanese). Japan Shogi Association. Retrieved December 14, 2017.
  4. ^ Sagasaki, Shūji (September 7, 2017). "Yūshō Shōkin Yonsensanbyakunijūmanen, Amachua demo Sankadekiru 「Ryūōsen」 no Shikumi towa?" 優勝ゆうしょう賞金しょうきん4320まんえん, アマチュアでも参加さんかできる 「竜王りゅうおうせん」 の仕組しくみとは? [A winner's prize of 43,200,000 yen and amateurs can participate: what is the format of the Ryūō tournament?] (in Japanese). Japan Shogi Association. Retrieved November 15, 2021.
  5. ^ "Purokisen no Kitei ni Kansuru Goshitsumon - Q: Eisei Shōgō no Kitei wa Dō Natteiru no Deshōka" プロ棋戦きせん規定きていかんするご質問しつもん — Q:永世えいせい称号しょうごう規定きていはどうなっているのでしょうか。 [Questions Regarding Professional Shogi— Q: What are the requirements for lifetime titles?] (in Japanese). Japan Shogi Association.
  6. ^ "Watanabe Akira Ryūō no Kyōdō Kisha Kaiken" 渡辺わたなべあきら竜王りゅうおう共同きょうどう記者きしゃ会見かいけん [Akira Watanabe Ryūō, Kyodo News Press Conference] (in Japanese). Japan Shogi Association. December 19, 2008. Retrieved August 7, 2014.
  7. ^ a b "Habu Yoshiharu Ōi ga Ryūōi wo Dakkaishi, Shijōhatsu no 「Eisei Nanakan」 no Shikaku wo Kakutoku" 羽生はぶ善治よしはる竜王りゅうおう奪回だっかいし, 史上しじょうはつの「永世えいせいななかん」の資格しかく獲得かくとく [Ōi title holder Yoshiharu Habu recaptures Ryūō title and becomes the first "Lifetime 7-crown" in history] (in Japanese). Japan Shogi Association. December 5, 2017. Retrieved December 5, 2017.
  8. ^ "Itodani Shin-Ryūō ga Tanjō, Taitoru Hatsuchōsen de Dasshu" 糸谷新いとだにしん竜王りゅうおう誕生たんじょう タイトルはつ挑戦ちょうせん奪取だっしゅ [New Ryuo Itodani Is Crowned. Captures Major Title on First Try]. Nihon Keizai Shimbun (in Japanese). December 4, 2014. Retrieved December 5, 2014.
  9. ^ Fukamatsu, Shinji (December 3, 2015). "Watanabe Kiō ga Ryūō Kaerizaki, Tsūsan Jikkime" 渡辺わたなべ棋王きおう竜王りゅうおうかえき, 通算つうさん10 [Watanbe Kio recaptures Ryuo Title for the 10th Time Overall]. Asahi Shimbun (in Japanese). Retrieved December 11, 2015.
  10. ^ Yamamura, Hideki (December 22, 2016). "Ryūōsen, Watanabe Nikan ga Bōei, Maruyama ni Yonshō Sanpai" 竜王りゅうおうせん, 渡辺わたなべ2かん防衛ぼうえい, 丸山まるやまに4しょう3はい [Ryūō match, Watanabe 2-crown defends title, defeats Maruyama 4-3]. Mainichi Shimbun (in Japanese). Retrieved December 25, 2016.
  11. ^ Yamamura, Hideki (December 5, 2017). "Japanese shogi pro Habu becomes first to qualify for 7 lifetime titles". Mainichi Shimbun. Retrieved December 5, 2017.
  12. ^ "Hirose Shinryūō ga Tanjō, Habu Zenryūō wa Nijūnananenburi Mukan" 広瀬ひろせしん竜王りゅうおう誕生たんじょう, 羽生はぶぜん竜王りゅうおうは27ねんぶり無冠むかん [Hirose is the new Ryūō titleholder; Habu unable to defend title and holds no major titles for the first time in 27 years]. Yomiuri Shimbun (in Japanese). December 21, 2018. Retrieved December 21, 2018.
  13. ^ "Shogi star Habu loses Ryuo title, holds no major crown for 1st time in 27 years". Mainichi Shimbun. December 21, 2018. Retrieved December 22, 2018.
  14. ^ "Toyoshima Meijin ga Hatsu no Ryūō Shōgi, Nikan ni Fukki" 豊島としま名人めいじんはつ竜王りゅうおう 将棋しょうぎ, 2かん復帰ふっき [Toyoshima Meijin captures Ryūō title for first time and returns to 2-crown status]. Sankei Shimbun (in Japanese). December 7, 2019. Retrieved December 7, 2019.
  15. ^ "Toyoshima Masayuki Ryūō ga Taitoru Hatsubōei Habu Kudan ni Yonshō Ippai" 豊島としま将之まさゆき竜王りゅうおうがタイトルはつ防衛ぼうえい 羽生はぶきゅうだんに4しょう1はい [Masayuki Toyoshima first defense of the Ryūō title is a success; he defeats Habu 9-dan 4 games to 1]. Nikkan Sports (in Japanese). December 6, 2020. Retrieved December 7, 2020.
  16. ^ "Shōgi・Fujii Sankan ga Ryūō Dasshu Sainenshō Jūkyusai de Yonkan" 将棋しょうぎ藤井ふじいさんかん竜王りゅうおう奪取だっしゅ 最年少さいねんしょう19さいよんかん [Fujii 3-crown captures Ryūō title to become the youngest 4-crown ever at age 19]. The Nikkei (in Japanese). November 13, 2021. Retrieved November 13, 2021.
  17. ^ "Fujii Sōta Ryūō ga Ryūō Hatsu Bōei Hatasu Watanabe Akira Meijin no Motsu Ryūō-i Sainenshō Bōei Kiroku wo Kōshin" 藤井ふじいさとしふとし竜王りゅうおう竜王りゅうおうはつ防衛ぼうえいたす 渡辺わたなべあきら名人めいじん竜王りゅうおう最年少さいねんしょう防衛ぼうえい記録きろく更新こうしん [Sōta Fujii Ryūō successful in first defense of Ryūō title; breaks Akira Watanabe Meijin's record for being the youngest person to successfully defend Ryūō title]. Sports Hochi (in Japanese). December 3, 2022. Retrieved December 4, 2022.
  18. ^ "Fujii Sōta Ryūō Sanrenpa, Hachikan Hatsuboei...Itō Takumi Nanadan ni Yon Renshō" 藤井ふじいさとしふとし竜王りゅうおう3連覇れんぱ, はちかんはつ防衛ぼうえい...伊藤いとうたくみななだんに4連勝れんしょう [Sōta Fujii wins Ryūō title for the third consencutive year; in his first title defense since becoming an 8-crown title holder, Fujii defeats Takumi Itō 7-dan 4 games to none.]. Yomiuri Shimbun (in Japanese). November 11, 2023. Retrieved November 14, 2023.
  19. ^ Yoshikawa, Kei (December 5, 2017). "Habu Yoshiharu ga Ryūōsen de Shori, Shijohatsu 「Eisei Nanakan」ni" 羽生はぶ善治よしはる竜王りゅうおうせん勝利しょうり 史上しじょうはつ永世えいせいななかん」に [Youshiharu Habu captures Ryūō title to become first "Lifetime 7-crown" in shogi history]. Huffington Post Japan (in Japanese). Retrieved January 17, 2018.
  20. ^ "Kaigai Taikyoku no Reikishi" 海外かいがい対局たいきょく歴史れきし [History of major title match games held overseas] (in Japanese). Yomiuri Shimbun and Japan Shogi Association. October 17, 2014. Retrieved October 22, 2014.
  21. ^ "Dai Nijūnanaki Ryūōsen Nanaban Shōbu" だい27竜王りゅうおうせんななばん勝負しょうぶ [27th Ryūō 7-game Match] (in Japanese). Yomiuri Shimbun and Japan Shogi Association. Archived from the original on October 22, 2014. Retrieved December 2, 2016.
  22. ^ Gordon, Larry (October 18, 1996). "Shogi Makes a Move: Stars of Chess-Like Japanese Game Play Tourney Round in L.A." Los Angeles Times. Retrieved July 7, 2016.
  23. ^ Burress, Charles (October 12, 2006). "Venerable Japanese game's high-stakes battle / Shogi players vie for title and $300,000 -- contest brought to U.S. to boost interest". San Francisco Chronicle. Retrieved July 7, 2016.
  24. ^ Mark, Steven (October 14, 2014). "Professional Shogi Tournament to Kick Off in Isles". Honolulu Star-Advertiser. Retrieved July 7, 2016 – via PressReader.
  25. ^ Murase, Shinya; Fukumatsu, Shinji (October 13, 2016). "Top 'shogi' player suspected of cheating pulls out of title match". Asahi Shimbun. Retrieved October 17, 2016.
  26. ^ "Top shogi player banned amid cheating allegations". Mainichi Shinbun. October 13, 2016. Retrieved October 17, 2016.
  27. ^ "Daisansha Chōsaiinkai Sechi no Ochirase" 第三者だいさんしゃ調査ちょうさ委員いいんかい設置せっちのおらせ [Establishment of a third-party investigative panel] (in Japanese). Japan Shogi Association. October 27, 2016. Retrieved January 11, 2016.
  28. ^ "Shogi association to set up investigative team to look into cheating allegations". Mainichi Shimbun. October 22, 2016. Retrieved January 11, 2017.
  29. ^ "Inquiry clears top 'shogi' player Hiroyuki Miura of cheating". Asahi Shimbun. December 27, 2016. Retrieved January 11, 2017.
  30. ^ "Chief of 'shogi' body reinstates top player, apologizes over cheating charge". Japan Times. Kyodo News. December 29, 2016. Retrieved January 11, 2017.
  31. ^ "Shogi player cleared, criticizes association". NHK World. December 27, 2016. Retrieved January 11, 2017.
  32. ^ Yamamura, Hideki; Mogami, Satoshi (January 18, 2017). "Head of shogi association resigns after top player cleared of cheating". Mainichi Shimbun. Retrieved January 18, 2017.
  33. ^ Yamamura, Hideki (January 19, 2017). "Tanigawa Kaichō to Shima Riji no Jinin Shōnin Rinji Rijikai" 谷川たにがわ会長かいちょうしま理事りじ辞任じにん承認しょうにん 臨時りんじ理事りじかい [Resignations of President Tanigawa and Director Shima accepted at emergency board of directors meeting]. Mainchi Shimbun (in Japanese). Retrieved January 19, 2017.
  34. ^ "3 shogi board members sacked over mishandling of software 'cheating' scandal". Mainichi Shimbun. February 28, 2017. Retrieved March 3, 2017.
  35. ^ Murase, Shinya (February 27, 2017). "Shōgi Renmei no Riji Sannin wo Kainin Sofuto Fusei Sōdō no Taiō Mondai Kaishiin" 将棋しょうぎ連盟れんめい理事りじ3にん解任かいにん ソフト不正ふせい騒動そうどう対応たいおう問題もんだい [Three Japan Shogi Association directors dismissed for problems related to the handling of the issue of inappropriate software use]. Asahi Shimbun (in Japanese). Retrieved February 28, 2017.
  36. ^ Yamamura, Hideki; Maruyama, Susumu (May 24, 2017). "Miura Kudan to Wakai Sofuto Mondai de" 三浦みうらきゅうだん和解わかい ソフト問題もんだい [Settlement reached with Miura 9-dan over software cheating problem]. Mainichi Shimbun (in Japanese). Retrieved May 26, 2017.
  37. ^ Yoshikawa, Kei (May 24, 2017). "Miura Kudan to Shōgi Renmai ga "Shōgi Sofuto Fusei Giwaku" de Wakai Isharyō wa Hikōkai (Kaiken Shōhō)" 三浦みうら弘行ひろゆききゅうだん将棋しょうぎ連盟れんめいが「将棋しょうぎソフト不正ふせい疑惑ぎわく」で和解わかい, 慰謝いしゃりょう公表こうひょう(会見かいけん詳報しょうほう) [Miura 9-dan and JSA reach settlement over "shogi software in appropriate use suspicion", amount of financial compensation undisclosed (press conference details)]. Huffington Post Japan (in Japanese). Retrieved May 26, 2017.
  38. ^ "Kishi Dētābēsu" 棋士きしデータベース [Player database] (in Japanese). Japan Shogi Association. Retrieved November 14, 2023.
  39. ^ "Ryūōsen" 竜王りゅうおうせん [Ryūō tournament] (in Japanese). Japan Shogi Association. Retrieved February 9, 2023.
  40. ^ "Dai Sanjūrokki Ryūōsen [Rokkumi] Rankingusen" だい36竜王りゅうおうせん [6くみ] ランキングせん [36th Ryūō tournament: Class 6 ranking tournament] (in Japanese). Japan Shogi Association. 2023. Retrieved February 9, 2023.
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