# |
Black player |
Rank |
White player |
Rank |
Result |
# moves |
Date |
Event |
Round |
1 | Oya Koichi | 7p | Shiraishi Yutaka | 9p | W+1 | 244 | 1991-10-24 | Gosei, 17th | 1-07 | 2 | Shuto Shun | 7p | Oya Koichi | 9p | W+R | 166 | 2013-01-17 | Tengen, 39th | | 3 | Oya Koichi | 9p | So Yokoku | 8p | W+1.5 | 271 | 2013-02-07 | Tengen, 39th | 1 | 4 | Oya Koichi | 6p | Sonoda Yuichi | 9p | B+3.5 | 249 | 1987-03-26 | Oza, 35th | Round 1-2 | 5 | Oya Koichi | 9p | Takao Shinji | 9p | W+13.5 | 284 | 2006-02-07 | Ryusei Cup, 15th | Block B, Game 09 | 6 | Oya Koichi | 9p | Takao Shinji | 9p | W+R | 136 | 2007-12-06 | Gosei, 33rd | Round 1 | 7 | Oya Koichi | 9p | Takao Shinji | 9p | W+R | 226 | 2011-11-17 | Tengen, 38th, preliminary tournament A | Final | 8 | Takao Shinji | 9p | Oya Koichi | 9p | B+R | 151 | 2011-12-03 | Daiwa Cup, 07th | 2 | 9 | Takemiya Masaki | 9p | Oya Koichi | 9p | W+0.5 | 251 | 1998-01-08 | Oza, 46th | Preliminaries, 3-2 | 10 | Oya Koichi | 9p | Takemiya Masaki | 9p | W+R | 164 | 2006-12-07 | Tengen, 33rd | 1 | 11 | Takemiya Masaki | 9p | Oya Koichi | 9p | W+2.5 | 271 | 2009-01-15 | | | 12 | Tokimoto Hajime | 8p | Oya Koichi | 8p | B+9.5 | 338 | 1999-02-01 | Ryusei Cup, 08th | Block B, Game 13 | 13 | Tono Hiroaki | 9p | Oya Koichi | 8p | B+R | 171 | 1998-01-01 | NHK Cup, 46th | 1-20 | 14 | Oya Koichi | 9p | Tsuruyama Atsushi | 7p | B+7.5 | 307 | 2012-12-15 | Daiwa Cup, 08th | 2 | 15 | Ushinohama Satsuo | 9p | Oya Koichi | 7p | B+2.5 | 286 | 1995-03-09 | Gosei, 20th | 1/8 Final - 5 | 16 | Oya Koichi | 6p | Wang Jianhong | 7p | B+R | 183 | 1987-05-24 | China-Japan Go Exchange, 15th | Round 3 | 17 | Oya Koichi | 9p | Whang Jinhyung | 1p ? | W+R | 156 | 2012-04-19 | LG Cup, 17th, integration preliminary tournament | | 18 | Yamada Kimio | 6p | Oya Koichi | 7p | W+12.5 | 181 | 1994-03-17 | Gosei, 19th | 1/8 Final - 7 | 19 | Oya Koichi | 8p | Yamada Kimio | 7p | W+R | 164 | 1997-02-27 | Oza, 45th | Preliminary Round 3-4 | 20 | Oya Koichi | 8p | Yamada Kimio | 8p | B+1 | 215 | 2000-12-07 | Honinbo, 56th | League, game 11 | 21 | Oya Koichi | 9p | Yamada Kimio | 9p | B+R | 177 | 2005-12-05 | Ryusei Cup, 15th | Block B, Game 06 | 22 | Yamada Wakio | 6p | Oya Koichi | 7p | W+R | 124 | 1991-08-22 | Judan, 30th | Losers' Section, 1-3 | 23 | Yamashita Keigo | 9p | Oya Koichi | 9p | W+R | 236 | 2012-11-17 | Daiwa Cup, 08th | 1 | 24 | Oya Koichi | ? pro | Yang Hui | 7p | B+1.5 | 308 | 1987-06-03 | China-Japan Go Exchange, 15th | Round 7 | 25 | Oya Koichi | ? pro | Yang Hui | 7p | B+0.5 | 231 | 1990-01-04 | China-Japan match | | 26 | Oya Koichi | 7p | Yo Kagen | 7p | B+R | 195 | 1995-06-15 | Oteai, 1995 | game 05 | 27 | Yo Kagen | 9p | Oya Koichi | 9p | B+R | 169 | 2007-03-15 | Ryusei Cup, 16th | block-D | 28 | Oya Koichi | 2p | Yoda Norimoto | 3p | B+R | 131 | | | | 29 | Oya Koichi | 5p | Yoda Norimoto | 6p | W+R | 198 | 1986-08-24 | Shin'ei, 17th | Final | 30 | Oya Koichi | 7p | Yoda Norimoto | 8p | W+R | 158 | 1991-06-20 | Judan, 30th | 1-03 | 31 | Oya Koichi | 8p | Yoda Norimoto | 9p | W+1.5 | 253 | 2000-01-13 | Oza, 48th | Preliminary Round 3-2 | 32 | Oya Koichi | 9p | Yoda Norimoto | 9p | B+0.5 | 279 | 2006-09-10 | Ryusei Cup, 15th | 2 | 33 | Yoda Norimoto | 9p | Oya Koichi | 9p | W+0.5 | 289 | 2008-11-27 | | | 34 | Yoda Norimoto | 9p | Oya Koichi | 9p | B+R | 135 | 2012-01-12 | Ryusei, 21st | block-G | 35 | Yokota Shigeaki | 9p | Oya Koichi | 9p | W+R | 188 | 2002-12-09 | Ryusei Cup, 12th | Block A, Game 07 | 36 | Oya Koichi | 9p | Yokota Shigeaki | 9p | W+R | 186 | 2005-01-06 | Tengen, 31st | 1-07 | 37 | Yu Bin | 6p | Oya Koichi | 6p | B+1.5 | 315 | 1987-05-28 | China-Japan Go Exchange, 15th | 5 | 38 | Yuki Satoshi | 8p | Oya Koichi | 7p | B+R | 101 | 1993-07-01 | Shinjin-O, 18th | Semifinal - 1 | 39 | Oya Koichi | 8p | Yuki Satoshi | 9p | B+R | 119 | 1998-04-02 | Oza, 46th | 1-01 | 40 | Oya Koichi | 8p | Yuki Satoshi | 9p | W+2 | 237 | 2001-04-05 | Honinbo, 56th | League, game 28 | 41 | Yuki Satoshi | 9p | Oya Koichi | 8p | B+5.5 | 249 | 2001-04-29 | NHK Cup, 49th | 1 | 42 | Yuki Satoshi | 9p | Oya Koichi | 9p | B+R | 187 | 2009-08-20 | Honinbo, 65th, preliminary tournament | Final | 43 | Oya Koichi | 9p | Yuki Satoshi | 9p | W+10.5 | 292 | 2013-01-19 | Daiwa Cup, 08th | 3 | 44 | Zhang Wendong | 5p | Oya Koichi | 6p | W+R | 210 | 1987-05-22 | China-Japan Go Exchange, 15th | Round 2 |
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