Fujisawa Hideyuki 9p
Born 1925 June 19; passed away 2009 May 8. Also known as Fujisawa Shūkō. Became professional in 1943; 9p in 1963. Became Honorary Kisei in 1977, after winning this title for six times in a row. Author of the Go-World article about the problem, and a book on Igo Hatsuyōron. He was assisted in solving the problem by Yasuda Yasutoshi 9p, and his son, Fujisawa Kazunari 8p.
Jeong SooHyun 9p
Born in 1956. Became professional in 1973; 9p in 1997. Dean of the Department of Baduk Studies at Myongji University, Seoul, Korea. Co-author, with Janice Kim 3p, of the "Learn To Play Go" Series. Confirmed the second throw-in. Found the correct moment for starting the endgame on the left side.
Michael Redmond 9p
Born 1963 May 25. Became professional in 1981; 9p in 2000. The first and only Western Go-professional to ever reach 9 dan. Introduced the kikashi in the bamboo joint. Found improvements for many of our sub-variations with the tenuki variations after the guzumi.
Yasuda Yasutoshi 9p
Born 1964 March 1. Became professional in 1985; 9p in 1998. Popularized the use of "Capture Go" for introducing children to the game. Member of Fujisawa Hideyuki's study group, who found the first known solution to the problem.
Fujisawa Kazunari 8p
Born 1964 August 12. Became professional in 1981; 8p in 1999. Son of Fujisawa Hideyuki 9p, and father of Fujisawa Rina 1p. Member of Fujisawa Hideyuki's study group, who found the first known solution to the problem.
Yoon YoungSun 8p
Born 1977 November 19. Became professional in 1992; 8p in 2010. Lives in Hamburg, Germany, and is busy in contributing to Go in Europe.
Ōhashi Hirofumi 7p
Born 1984 May 25. Became professional in 2002; 7p in 2021. Found the technically correct sequence for filling the Nakade.
Cheng Xiaoliu 6p
Born 1946 January 26. Became 6p in 1982. Author of two Chinese editions of Igo Hatsuyōron.
Yamada Shinji 6p
Born 1983 July 14. Became professional in 2001; 6p in 2012. Validated Joachim's oki and found the Tsuke in the top left corner.
Kobayashi Chizu 5p
Born 1954 September 28. Became professional in 1972; 5p in 1976. Established the contact to Ōhashi Hirofumi 7p.
Kang KyoungNang 7d Amateur
Former Korean Yeongusaeng (student to become a professional player). Was teaching Baduk in Europe from 2010 to 2011.
Merlijn Kuin 6d Amateur
Became 6d in 2007. Lives in Amstelveen, the Netherlands. Was several times Dutch champion. Introduced "Dōsetsu's Problem" to goproblems.com.
Benjamin Teuber 6d Amateur
Became 6d in 2004. Lives in Hamburg, Germany. Established the contact to Yamada Shinji 6p.
Sergei Danilov 4d Amateur
Lives in Moscow, Russia. Nickname "dany". Found the atekomi, and the ensuing ko fight, in the left centre. Suggested to sacrifice White's two stones in the lower left.
Jérôme Hubert 3d Amateur
Lives in Paris, France. His website on the game of Go includes a commented solution of Igo Hatsuyoron 120.
Harry Fearnley 2d Amateur
Lives in Oxford, United Kingdom. Is very fond of mysterious "beasts", e.g. hanezeki. Specialises in studies of seki, especially hanezeki. Found the Hasami-Tsuke in the top right corner.
Denis Feldmann 2d Amateur
Lives in Montpellier, France. His website on "Commented bestiary" - i.e. a collection of strange situations, famous tesuji and other wonders - includes a solution for Igo Hatsuyoron 120.
Thomas Redecker 1k Amateur
Lives in Berlin, Germany. Author of several articles about the problem in the German Go-Journal since 2005, and editor of the corresponding Website. Found the guzumi in the top right corner, and the second throw-in.
Joachim Meinhardt 4k Amateur
Lives in Frankfurt/Main, Germany. Has studied the problem since 1999. Rediscovered the decisive oki in the lower right corner, putting the so far known professional solutions into question. Found the very complicated Ko-fight variations.
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