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Games played by Kobayashi Koichi
Total: 1645; won: 990; winning percentage: 60.2%
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| Black | White | Result | Replay | Download | |
 [2017-12-14] 43rd Japanese Kisei, preliminary
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| Ono Nobuyuki 7p | Kobayashi Koichi 9p | W+R |  |
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| [2017-12-07] 66th Japanese Oza, preliminary
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| Kobayashi Koichi 9p | Kono Mitsuki 8p | B+R | |
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| [2017-11-16] 43rd Japanese Kisei, preliminary
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| Kobayashi Koichi 9p | Kurotaki Masaki 6p | B+2.5 | |
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| [2017-11-09] 44th Japanese Tengen, preliminary
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| Arimura Hiroshi 8p | Kobayashi Koichi 9p | W+7.5 | |
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| [2017-10-26] 57th Japanese Judan, preliminary
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| Mukai Chiaki 5p | Kobayashi Koichi 9p | W+R | |
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| [2017-10-08] Year 2017 Zhangshu Cup
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| Seo Bongsoo 9p | Kobayashi Koichi 9p | B+R | |
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| [2017-09-28] 44th Japanese Tengen, preliminary
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| Lee Ishu 7p | Kobayashi Koichi 9p | W+R | |
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| [2017-09-21] 57th Japanese Judan, preliminary
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| Kobayashi Koichi 9p | Kamimura Haruo 9p | B+R | |
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| [2017-09-07] 44th Japanese Tengen, preliminary
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| Horimoto Mitsunari 4p | Kobayashi Koichi 9p | W+R | |
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| [2017-08-24] 57th Japanese Judan, preliminary
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| Kato Tomoko 6p | Kobayashi Koichi 9p | W+1.5 | |
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| [2017-07-20] 43rd Japanese Meijin, preliminary
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| Michael Redmond 9p | Kobayashi Koichi 9p | B+R | |
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| [2017-05-25] 43rd Japanese Meijin, preliminary
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| Kobayashi Koichi 9p | Matsumoto Takehisa 7p | B+R | |
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| [2017-04-27] 1st China-Japan-Korea Veterans Tournament, final
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| Kobayashi Koichi 9p | Cao Dayuan 9p | W+0.5 | |
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| [2017-04-26] 1st China-Japan-Korea Veterans Tournament, semi-final
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| Yu Bin 9p | Kobayashi Koichi 9p | W+0.5 | |
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| [2017-04-25] 1st China-Japan-Korea Veterans Tournament, round 2
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| Kobayashi Koichi 9p | Nie Weiping 9p | B+R | |
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| [2017-04-25] 1st China-Japan-Korea Veterans Tournament, round 1
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| Hua Yigang 9p | Kobayashi Koichi 9p | W+R | |
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| [2017-03-02] 7th Japanese Igo Masters Cup, round 1
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| Takemiya Masaki 9p | Kobayashi Koichi 9p | B+1.5 | |
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| [2017-02-16] 26th Japanese Ryusei, group A
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| Kobayashi Koichi 9p | Adachi Toshimasa 4p | W+3.5 | |
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| [2017-02-16] 26th Japanese Ryusei, group A
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| Shida Tatsuya 7p | Kobayashi Koichi 9p | W+1.5 | |
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| [2017-02-06] 4th Championship of Tournament Winners, round 1
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| Kobayashi Koichi 9p | Onishi Ryuhei 2p | W+6.5 | |
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| [2017-01-12] 42nd Japanese Kisei, preliminary
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| Kobayashi Koichi 9p | Yashiro Kumiko 6p | W+3.5 | |
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| [2016-12-08] 42nd Japanese Kisei, preliminary
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| Tsuneishi Takashi 3p | Kobayashi Koichi 9p | W+4.5 | |
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| [2016-12-01] 65th Japanese Oza, preliminary
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| Ko Iso 8p | Kobayashi Koichi 9p | B+12.5 | |
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| [2016-11-17] 42nd Japanese Gosei, round 1
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| Motoki Katsuya 7p | Kobayashi Koichi 9p | B+5.5 | |
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| [2016-11-03] 56th Japanese Judan, preliminary
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| Kobayashi Koichi 9p | Onishi Ryuhei 2p | W+R | |
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| [2016-10-06] 73rd Japanese Honinbo, preliminary
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| Kanazawa Makoto 7p | Kobayashi Koichi 9p | B+9.5 | |
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| [2016-09-22] 65th Japanese Oza, preliminary
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| Hsu Chiayuan 4p | Kobayashi Koichi 9p | W+R | |
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| [2016-09-15] 43rd Japanese Tengen, preliminary
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| Onishi Ryuhei 2p | Kobayashi Koichi 9p | B+0.5 | |
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| [2016-08-25] 65th Japanese Oza, preliminary
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| Muramatsu Ryuichi 8p | Kobayashi Koichi 9p | W+3.5 | |
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| [2016-08-04] 42nd Japanese Gosei, preliminary
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| Uchida Shuhei 7p | Kobayashi Koichi 9p | W+R | |
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