One Sided Match Results
Keywords: Culture & History
Big Seven title matches in which the loser was unable to win any games.
The Kisei, Meijin and Honinbo are best of seven (requiring 4-0); the Tengen, Gosei and Judan are best of five (requiring 3-0). The Oza has also been a best of five since (apparently) 1984, previously a best of three.
The years, since 1964, in which every challenger won at least one game were 1967-68, '71-72, '74, '76, '78, '82-83, '90-92, 2003, '14, '19 and '21.
Iyama Yuta's dominance from 2011 to 2018 can be seen very clearly at the bottom of the table.
| Year | Event | Winner | Loser | Won by |
|---|---|---|---|---|
| 1950 | 5th Honinbo | Hashimoto Utaro | Iwamoto Kaoru | Challenger |
| 1955 | 10th Honinbo | Takagawa Kaku | Shimamura Toshihiro | Incumbent |
| ---- | ||||
| 1964 | 19th Honinbo | Sakata Eio | Takagawa Kaku | Incumbent |
| 1965 | 20th Honinbo | Sakata Eio | Yamabe Toshiro | Incumbent |
| 1966 | 21st Honinbo | Sakata Eio | Fujisawa Hideyuki | Incumbent |
| 1969 | 8th Judan | Otake Hideo | Sakata Eio | Challenger |
| ---- | ||||
| 1970 | 25th Honinbo | Rin Kaiho | Sakata Eio | Incumbent |
| 1973 | 28th Honinbo | Ishida Yoshio | Rin Kaiho | Incumbent |
| 1973 | 11th Judan | Sakata Eio | Takagi Shoichi | Incumbent |
| 1975 | 13th Judan | Rin Kaiho | Hashimoto Shoji | Challenger |
| 1977 | 2nd Meijin | Rin Kaiho | Otake Hideo | Challenger |
| 1977 | 2nd Gosei | Kato Masao | Takemiya Masaki | Incumbent |
| 1977 | 15th Judan | Kato Masao | Sakata Eio | Incumbent |
| 1979 | 5th Tengen | Kato Masao | Kataoka Satoshi | N/A |
| 1979 | 4th Gosei | Cho Chikun | Otake Hideo | Challenger |
| ---- | ||||
| 1980 | 6th Tengen | Kato Masao | Yamabe Toshiro | Incumbent |
| 1981 | 5th Kisei | Fujisawa Hideyuki | Otake Hideo | Incumbent |
| 1981 | 6th Meijin | Cho Chikun | Kato Masao | Incumbent |
| 1981 | 19th Judan | Otake Hideo | Hashimoto Shoji | Incumbent |
| 1984 | 32nd Oza | Kato Masao | Yamashiro Hiroshi | Incumbent |
| 1985 | 33rd Oza | Kato Masao | Kobayashi Koichi | Incumbent |
| 1985 | 11th Tengen | Kobayashi Koichi | Ishida Yoshio | Challenger |
| 1985 | 23rd Judan | Kobayashi Koichi | Otake Hideo | Incumbent |
| 1986 | 11th Meijin | Kato Masao | Kobayashi Koichi | Challenger |
| 1986 | 11th Gosei | Cho Chikun | Otake Hideo | Challenger |
| 1986 | 24th Judan | Kobayashi Koichi | Takemiya Masaki | Incumbent |
| 1987 | 12th Meijin | Kato Masao | Rin Kaiho | Incumbent |
| 1987 | 42nd Honinbo | Takemiya Masaki | Yamashiro Hiroshi | Incumbent |
| 1988 | 36th Oza | Kato Masao | Takemiya Masaki | Incumbent |
| 1988 | 13th Gosei | Kobayashi Koichi | Kato Masao | Challenger |
| 1989 | 44th Honinbo | Cho Chikun | Takemiya Masaki | Challenger |
| 1989 | 27th Judan | Cho Chikun | Rin Kaiho | Incumbent |
| ---- | ||||
| 1993 | 41st Oza | Kato Masao | Fujisawa Hideyuki | Challenger |
| 1993 | 18th Gosei | Kobayashi Koichi | Rin Kaiho | Incumbent |
| 1994 | 19th Meijin | Kobayashi Koichi | Rin Kaiho | Incumbent |
| 1995 | 43rd Oza | O Rissei | Cho Chikun | Challenger |
| 1995 | 33rd Judan | Yoda Norimoto | Otake Hideo | Challenger |
| 1996 | 44th Oza | Ryu Shikun | O Rissei | Challenger |
| 1996 | 21st Gosei | Yoda Norimoto | Kobayashi Satoru | Challenger |
| 1997 | 52nd Honinbo | Cho Chikun | Kato Masao | Incumbent |
| 1998 | 46th Oza | O Rissei | Yamada Kimio | Challenger |
| 1998 | 23rd Gosei | Yoda Norimoto | Sonoda Yuichi | Incumbent |
| 1999 | 25th Tengen | Kobayashi Koichi | Kudo Norio | Incumbent |
| 1999 | 37th Judan | Kobayashi Koichi | Hikosaka Naoto | Challenger |
| ---- | ||||
| 2000 | 25th Meijin | Yoda Norimoto | Cho Chikun | Challenger |
| 2000 | 26th Tengen | Ryu Shikun | Kobayashi Koichi | Challenger |
| 2000 | 38th Judan | Kobayashi Koichi | Nakano Hironari | Incumbent |
| 2001 | 49th Oza | Cho Chikun | O Rissei | Challenger |
| 2002 | 28th Tengen | Hane Naoki | Cho Sonjin | Incumbent |
| 2004 | 30th Tengen | Yamashita Keigo | Hane Naoki | Challenger |
| 2005 | 53rd Oza | Cho U | Yamashita Keigo | Incumbent |
| 2005 | 30th Gosei | Yoda Norimoto | Yuki Satoshi | Incumbent |
| 2006 | 30th Kisei | Yamashita Keigo | Hane Naoki | Incumbent |
| 2006 | 31st Gosei | Cho U | Yoda Norimoto | Challenger |
| 2007 | 31st Kisei | Yamashita Keigo | Kobayashi Satoru | Incumbent |
| 2007 | 32nd Gosei | Cho U | Yokota Shigeaki | Incumbent |
| 2008 | 34th Tengen | Cho Chikun | Kono Rin | Challenger |
| 2008 | 46th Judan | Takao Shinji | Cho Chikun | Challenger |
| 2009 | 57th Oza | Cho U | Yamada Kimio | Incumbent |
| 2009 | 34th Gosei | Cho U | Yuki Satoshi | Incumbent |
| ---- | ||||
| 2010 | 35th Meijin | Iyama Yuta | Takao Shinji | Incumbent |
| 2010 | 58th Oza | Cho U | Yamada Kimio | Incumbent |
| 2010 | 36th Tengen | Yuki Satoshi | Yamashita Keigo | Challenger |
| 2010 | 48th Judan | Cho U | Yamashita Keigo | Incumbent |
| 2011 | 59th Oza | Cho U | Hane Naoki | Incumbent |
| 2011 | 37th Tengen | Iyama Yuta | Yuki Satoshi | Challenger |
| 2012 | 60th Oza | Iyama Yuta | Cho U | Challenger |
| 2012 | 38th Tengen | Iyama Yuta | Kono Rin | Incumbent |
| 2012 | 37th Gosei | Iyama Yuta | Hane Naoki | Challenger |
| 2013 | 39th Tengen | Iyama Yuta | Akiyama Jiro | Incumbent |
| 2015 | 40th Meijin | Iyama Yuta | Takao Shinji | Incumbent |
| 2015 | 63rd Oza | Iyama Yuta | Murakawa Daisuke | Incumbent |
| 2015 | 41st Tengen | Iyama Yuta | Takao Shinji | Incumbent |
| 2016 | 40th Kisei | Iyama Yuta | Yamashita Keigo | Incumbent |
| 2016 | 64th Oza | Iyama Yuta | Yo Seiki | Incumbent |
| 2016 | 41st Gosei | Iyama Yuta | Murakawa Daisuke | Incumbent |
| 2017 | 72nd Honinbo | Iyama Yuta | Motoki Katsuya | Incumbent |
| 2017 | 65th Oza | Iyama Yuta | Ichiriki Ryo | Incumbent |
| 2017 | 43rd Tengen | Iyama Yuta | Ichiriki Ryo | Incumbent |
| 2017 | 42nd Gosei | Iyama Yuta | Yamashita Keigo | Incumbent |
| 2018 | 42nd Kisei | Iyama Yuta | Ichiriki Ryo | Incumbent |
| 2018 | 43rd Gosei | Kyo Kagen | Iyama Yuta | Challenger |
| 2018 | 56th Judan | Iyama Yuta | Murakawa Daisuke | Incumbent |
| ---- | ||||
| 2020 | 45th Gosei | Ichiriki Ryo | Hane Naoki | Incumbent |
| 2022 | 60th Judan | Kyo Kagen | Yo Seiki | Incumbent |
| 2022 | 77th Honinbo | Iyama Yuta | Ichiriki Ryo | Incumbent |
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