The Gosei title is decided in a best of five match. The challenger is decided in a large knockout tournament starting with about 40 players. The 17th edition will give you an idea of the current tournament structure.
The Gosei tournament formula initially consisted of a knockout preliminaries to qualify for the challenger league. In case of tied 1st place a challenger playoff would decide the challenger of the title holder. The 2nd edition is a good example of this formula.
The formula changed again with the 5th edition. A challenger knockout tournament decides the two players who will compete in a best-of-three match the challenger for the title match.
The Japanese Title Overview page shows what's available.
   | ||||
|---|---|---|---|---|
| Edition | Final | Details | ||
| 46th | 2021 | Iyama Yuta | Ichiriki Ryo | 3-2 |
| 45th | 2020 | Ichiriki Ryo | Hane Naoki | 3-0 |
| 44th | 2019 | Hane Naoki | Kyo Kagen | 3-2 |
| 43rd | 2018 | Kyo Kagen | Iyama Yuta | 3-0 |
| 42nd | 2017 | Iyama Yuta | Yamashita Keigo | 3-0 |
| 41st | 2016 | Iyama Yuta | Murakawa Daisuke | 3-0 |
| 40th | 2015 | Iyama Yuta | Yamashita Keigo | 3-1 |
| 39th | 2014 | Iyama Yuta | Kono Rin | 3-2 |
| 38th | 2013 | Iyama Yuta | Kono Rin | 3-2 |
| 37th | 2012 | Iyama Yuta | Hane Naoki | 3-0 |
| 36th | 2011 | Hane Naoki | Sakai Hideyuki | 3-2 |
| 35th | 2010 | Sakai Hideyuki | Cho U | 3-2 |
| 34th | 2009 | Cho U | Yuki Satoshi | 3-0 |
| 33rd | 2008 | Cho U | Yamashita Keigo | 3-1 |
| 32nd | 2007 | Cho U | Yokota Shigeaki | 3-0 |
| 31st | 2006 | Cho U | Yoda Norimoto | 3-0 |
| 30th | 2005 | Yoda Norimoto | Yuki Satoshi | 3-0 |
| 29th | 2004 | Yoda Norimoto | Yamada Kimio | 3-1 |
| 28th | 2003 | Yoda Norimoto | Kobayashi Koichi | 3-2 |
| 27th | 2002 | Kobayashi Koichi | Yuki Satoshi | 3-1 |
| 26th | 2001 | Kobayashi Koichi | Yamashita Keigo | 3-2 |
| 25th | 2000 | Yamashita Keigo | Kobayashi Koichi | 3-2 |
| 24th | 1999 | Kobayashi Koichi | Yoda Norimoto | 3-2 |
| 23rd | 1998 | Yoda Norimoto | Sonoda Yuichi | 3-0 |
| 22nd | 1997 | Yoda Norimoto | Yuki Satoshi | 3-1 |
| 21st | 1996 | Yoda Norimoto | Kobayashi Satoru | 3-0 |
| 20th | 1995 | Kobayashi Satoru | Rin Kaiho | 3-2 |
| 19th | 1994 | Rin Kaiho | Kobayashi Koichi | 3-1 |
| 18th | 1993 | Kobayashi Koichi | Rin Kaiho | 3-0 |
| 17th | 1992 | Kobayashi Koichi | Kobayashi Satoru | 3-1 |
| 16th | 1991 | Kobayashi Koichi | Kobayashi Satoru | 3-2 |
| 15th | 1990 | Kobayashi Koichi | Kobayashi Satoru | 3-0 |
| 14th | 1989 | Kobayashi Koichi | Imamura Toshiya | 3-1 |
| 13th | 1988 | Kobayashi Koichi | Kato Masao | 3-0 |
| 12th | 1987 | Kato Masao | Cho Chikun | 3-1 |
| 11th | 1986 | Cho Chikun | Otake Hideo | 3-0 |
| 10th | 1985 | Otake Hideo | Kudo Norio | 3-1 |
| 9th | 1984 | Otake Hideo | Kato Masao | 3-1 |
| 8th | 1983 | Otake Hideo | Awaji Shuzo | 3-2 |
| 7th | 1982 | Otake Hideo | Cho Chikun | 3-2 |
| 6th | 1981 | Otake Hideo | Kato Masao | 3-1 |
| 5th | 1980 | Otake Hideo | Cho Chikun | 3-1 |
| 4th | 1979 | Cho Chikun | Otake Hideo | 3-0 |
| 3rd | 1978 | Otake Hideo | Kato Masao | 3-1 |
| 2nd | 1977 | Kato Masao | Takemiya Masaki | 3-0 |
| 1st | 1976 | Kato Masao | Otake Hideo | 3-2 |
