Games Between Two Players
Kato Masao (54 win; 49 loss) vs. Kobayashi Koichi
| Game Date and Game Description | |||||
| Black | White | Result | Replay | Download | |
 [2004-02-26] 59th Japanese Honinbo, league
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| Kato Masao 9p | Kobayashi Koichi 9p | B+R |  |
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| [2004-01-22] 29th Japanese Gosei, round 1
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| Kobayashi Koichi 9p | Kato Masao 9p | B+1.5 | |
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| [2003-01-05] 50th Japanese NHK Cup, round 3
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| Kato Masao 9p | Kobayashi Koichi 9p | B+4.5 | |
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| [2002-08-24] 11th Japanese Ryusei, semi-final
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| Kobayashi Koichi 9p | Kato Masao 9p | B+2.5 | |
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| [2001-08-12] 49th Japanese NHK Cup, round 2
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| Kobayashi Koichi 9p | Kato Masao 9p | W+1.5 | |
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| [2000-08-20] 33rd Japanese Hayago Championship, round 2
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| Kato Masao 9p | Kobayashi Koichi 9p | W+R | |
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| [2000-05-25] 48th Japanese Oza, round 2
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| Kato Masao 9p | Kobayashi Koichi 9p | B+5.5 | |
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| [2000-02-19] 19th Japanese NEC Cup, semi-final
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| Kato Masao 9p | Kobayashi Koichi 9p | B+R | |
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| [1999-12-08] 25th Japanese Meijin, league
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| Kato Masao 9p | Kobayashi Koichi 9p | W+R | |
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| [1999-06-06] 32nd Japanese Hayago Championship, round 1
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| Kobayashi Koichi 9p | Kato Masao 9p | W+0.5 | |
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| [1999-04-22] 24th Japanese Gosei, round 3
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| Kobayashi Koichi 9p | Kato Masao 9p | B+R | |
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| [1999-02-15] 21st Japanese Kakusei, semi-final
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| Kato Masao 9p | Kobayashi Koichi 9p | B+4.5 | |
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| [1999-01-21] 24th Japanese Meijin, league
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| Kato Masao 9p | Kobayashi Koichi 9p | W+3.5 | |
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| [1998-11-28] 18th Japanese NEC Cup, round 2
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| Kobayashi Koichi 9p | Kato Masao 9p | B+R | |
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| [1998-10-15] 23rd Japanese Kisei, semi-final
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| Kato Masao 9p | Kobayashi Koichi 9p | W+2.5 | |
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| [1998-08-20] 37th Japanese Judan, winner section round 2
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| Kobayashi Koichi 9p | Kato Masao 9p | B+2.5 | |
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| [1997-12-11] 23rd Japanese Meijin, league
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| Kobayashi Koichi 9p | Kato Masao 9p | B+2.5 | |
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| [1997-05-05] 45th Japanese Oza, round 1
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| Kobayashi Koichi 9p | Kato Masao 9p | B+0.5 | |
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| [1997-03-27] 22nd Japanese Meijin, league
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| Kato Masao 9p | Kobayashi Koichi 9p | B+0.5 | |
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| [1997-03-24] 19th Japanese Kakusei, final
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| Kato Masao 9p | Kobayashi Koichi 9p | W+R | |
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| [1997-02-01] 16th Japanese NEC Cup, semi-final
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| Kato Masao 9p | Kobayashi Koichi 9p | B+3.5 | |
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| [1996-12-19] 35th Japanese Judan, loser section final
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| Kato Masao 9p | Kobayashi Koichi 9p | B+5.5 | |
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| [1996-05-16] 21st Japanese Meijin, league
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| Kobayashi Koichi 9p | Kato Masao 9p | W+R | |
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| [1995-10-19] 20th Japanese Kisei, semi-final
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| Kobayashi Koichi 9p | Kato Masao 9p | W+0.5 | |
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| [1994-10-17] 50th Japanese Honinbo, league
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| Kato Masao 9p | Kobayashi Koichi 9p | B+R | |
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| [1993-03-17] 17th Japanese Kisei, title match #7
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| Kobayashi Koichi 9p | Kato Masao 9p | B+R | |
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| [1993-03-10] 17th Japanese Kisei, title match #6
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| Kobayashi Koichi 9p | Kato Masao 9p | B+0.5 | |
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| [1993-02-24] 17th Japanese Kisei, title match #5
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| Kato Masao 9p | Kobayashi Koichi 9p | W+R | |
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| [1993-02-17] 17th Japanese Kisei, title match #4
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| Kobayashi Koichi 9p | Kato Masao 9p | W+0.5 | |
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| [1993-02-03] 17th Japanese Kisei, title match #3
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| Kato Masao 9p | Kobayashi Koichi 9p | W+1.5 | |
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| [1993-01-27] 17th Japanese Kisei, title match #2
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| Kobayashi Koichi 9p | Kato Masao 9p | W+2.5 | |
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| [1993-01-13] 17th Japanese Kisei, title match #1
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| Kato Masao 9p | Kobayashi Koichi 9p | B+R | |
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| [1992-03-07] 11th Japanese NEC Cup, final
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| Kobayashi Koichi 9p | Kato Masao 9p | W+10.5 | |
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| [1992-03-02] 47th Japanese Honinbo, league
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| Kato Masao 9p | Kobayashi Koichi 9p | W+0.5 | |
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| [1991-03-19] 15th Japanese Kisei, title match #7
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| Kato Masao 9p | Kobayashi Koichi 9p | W+4.5 | |
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| [1991-03-13] 15th Japanese Kisei, title match #6
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| Kobayashi Koichi 9p | Kato Masao 9p | W+0.5 | |
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| [1991-02-27] 15th Japanese Kisei, title match #5
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| Kato Masao 9p | Kobayashi Koichi 9p | W+5.5 | |
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| [1991-02-20] 15th Japanese Kisei, title match #4
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| Kobayashi Koichi 9p | Kato Masao 9p | W+5.5 | |
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| [1991-02-06] 15th Japanese Kisei, title match #3
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| Kato Masao 9p | Kobayashi Koichi 9p | W+R | |
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| [1991-01-30] 15th Japanese Kisei, title match #2
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| Kobayashi Koichi 9p | Kato Masao 9p | B+1.5 | |
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| [1991-01-18] 15th Japanese Kisei, title match #1
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| Kato Masao 9p | Kobayashi Koichi 9p | B+1.5 | |
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| [1988-12-22] 44th Japanese Honinbo, league
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| Kobayashi Koichi 9p | Kato Masao 9p | W+3.5 | |
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| [1988-11-02] 27th Japanese Judan, winner section round 2
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| Kato Masao 9p | Kobayashi Koichi 9p | B+R | |
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| [1988-10-19] 13th Japanese Meijin, title match #5
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| Kato Masao 9p | Kobayashi Koichi 9p | W+R | |
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| [1988-10-12] 13th Japanese Meijin, title match #4
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| Kobayashi Koichi 9p | Kato Masao 9p | B+R | |
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| [1988-09-28] 13th Japanese Meijin, title match #3
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| Kato Masao 9p | Kobayashi Koichi 9p | W+2.5 | |
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| [1988-09-20] 13th Japanese Meijin, title match #2
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| Kobayashi Koichi 9p | Kato Masao 9p | B+R | |
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| [1988-09-07] 13th Japanese Meijin, title match #1
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| Kato Masao 9p | Kobayashi Koichi 9p | B+R | |
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| [1988-07-28] 13th Japanese Gosei, title match #3
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| Kobayashi Koichi 9p | Kato Masao 9p | B+R | |
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| [1988-07-14] 13th Japanese Gosei, title match #2
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| Kato Masao 9p | Kobayashi Koichi 9p | W+R | |
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| [1988-06-25] 13th Japanese Gosei, title match #1
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| Kobayashi Koichi 9p | Kato Masao 9p | B+R | |
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| [1988-03-30] 43rd Japanese Honinbo, league
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| Kato Masao 9p | Kobayashi Koichi 9p | W+0.5 | |
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| [1988-02-24] 12th Japanese Kisei, title match #5
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| Kato Masao 9p | Kobayashi Koichi 9p | W+0.5 | |
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| [1988-02-17] 12th Japanese Kisei, title match #4
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| Kobayashi Koichi 9p | Kato Masao 9p | W+8.5 | |
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| [1988-02-03] 12th Japanese Kisei, title match #3
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| Kato Masao 9p | Kobayashi Koichi 9p | W+R | |
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| [1988-01-27] 12th Japanese Kisei, title match #2
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| Kobayashi Koichi 9p | Kato Masao 9p | B+7.5 | |
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| [1988-01-13] 12th Japanese Kisei, title match #1
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| Kato Masao 9p | Kobayashi Koichi 9p | W+1.5 | |
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| [1987-06-11] 12th Japanese Gosei, challenger decision match
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| Kato Masao 9p | Kobayashi Koichi 9p | B+R | |
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| [1987-04-16] 25th Japanese Judan, title match #4
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| Kobayashi Koichi 9p | Kato Masao 9p | W+0.5 | |
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| [1987-04-09] 42nd Japanese Honinbo, league
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| Kato Masao 9p | Kobayashi Koichi 9p | W+6.5 | |
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| [1987-04-02] 25th Japanese Judan, title match #3
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| Kato Masao 9p | Kobayashi Koichi 9p | W+R | |
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| [1987-03-27] 25th Japanese Judan, title match #2
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| Kobayashi Koichi 9p | Kato Masao 9p | W+4.5 | |
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| [1987-03-05] 25th Japanese Judan, title match #1
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| Kato Masao 9p | Kobayashi Koichi 9p | B+R | |
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| [1986-10-08] 11th Japanese Meijin, title match #4
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| Kobayashi Koichi 9p | Kato Masao 9p | W+2.5 | |
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| [1986-10-01] 11th Japanese Meijin, title match #3
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| Kato Masao 9p | Kobayashi Koichi 9p | B+4.5 | |
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| [1986-09-17] 11th Japanese Meijin, title match #2
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| Kobayashi Koichi 9p | Kato Masao 9p | W+0.5 | |
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| [1986-09-10] 11th Japanese Meijin, title match #1
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| Kato Masao 9p | Kobayashi Koichi 9p | B+R | |
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| [1986-03-09] 33rd Japanese NHK Cup, semi-final
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| Kato Masao 9p | Kobayashi Koichi 9p | W+4.5 | |
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| [1985-12-19] 10th Japanese Kisei, challenger decision match #3
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| Kato Masao 9p | Kobayashi Koichi 9p | W+R | |
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| [1985-12-12] 10th Japanese Kisei, challenger decision match #2
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| Kato Masao 9p | Kobayashi Koichi 9p | B+1.5 | |
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| [1985-11-26] 10th Japanese Kisei, challenger decision match #1
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| Kobayashi Koichi 9p | Kato Masao 9p | B+R | |
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| [1985-10-31] 33rd Japanese Oza, title match #3
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| Kato Masao 9p | Kobayashi Koichi 9p | B+4.5 | |
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| [1985-10-09] 33rd Japanese Oza, title match #2
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| Kobayashi Koichi 9p | Kato Masao 9p | W+0.5 | |
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| [1985-09-19] 33rd Japanese Oza, title match #1
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| Kato Masao 9p | Kobayashi Koichi 9p | B+R | |
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| [1985-04-25] 10th Japanese Meijin, league
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| Kato Masao 9p | Kobayashi Koichi 9p | B+5.5 | |
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| [1984-04-18] 22nd Japanese Judan, title match #5
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| Kato Masao 9p | Kobayashi Koichi 9p | W+R | |
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| [1984-04-04] 22nd Japanese Judan, title match #4
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| Kobayashi Koichi 9p | Kato Masao 9p | B+R | |
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| [1984-03-29] 22nd Japanese Judan, title match #3
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| Kato Masao 9p | Kobayashi Koichi 9p | W+R | |
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| [1984-03-15] 22nd Japanese Judan, title match #2
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| Kobayashi Koichi 9p | Kato Masao 9p | W+7.5 | |
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| [1984-02-29] 22nd Japanese Judan, title match #1
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| Kato Masao 9p | Kobayashi Koichi 9p | B+R | |
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| [1983-12-01] 9th Japanese Meijin, league
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| Kato Masao 9p | Kobayashi Koichi 9p | W+R | |
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| [1983-04-21] 8th Japanese Meijin, league
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| Kobayashi Koichi 9p | Kato Masao 9p | W+1.5 | |
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| [1983-02-10] 21st Japanese Judan, challenger decision match
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| Kato Masao 9p | Kobayashi Koichi 9p | B+R | |
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| [1982-11-25] 7th Japanese Kisei, semi-final
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| Kobayashi Koichi 9p | Kato Masao 9p | W+3.5 | |
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| [1982-05-06] 7th Japanese Gosei, semi-final
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| Kato Masao 9p | Kobayashi Koichi 9p | W+R | |
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| [1982-03-18] 7th Japanese Meijin, league
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| Kobayashi Koichi 9p | Kato Masao 9p | B+R | |
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| [1982-01-27] 37th Japanese Honinbo, league
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| Kobayashi Koichi 9p | Kato Masao 9p | B+1.5 | |
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| [1981-12-28] 7th Japanese Tengen, title match #5
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| Kobayashi Koichi 9p | Kato Masao 9p | W+5.5 | |
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| [1981-12-21] 7th Japanese Tengen, title match #4
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| Kobayashi Koichi 9p | Kato Masao 9p | B+2.5 | |
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| [1981-12-10] 7th Japanese Tengen, title match #3
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| Kato Masao 9p | Kobayashi Koichi 9p | B+R | |
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| [1981-12-03] 7th Japanese Tengen, title match #2
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| Kobayashi Koichi 9p | Kato Masao 9p | B+R | |
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| [1981-11-25] 7th Japanese Tengen, title match #1
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| Kato Masao 9p | Kobayashi Koichi 9p | B+3.5 | |
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| [1981-08-13] 6th Japanese Meijin, league
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| Kato Masao 9p | Kobayashi Koichi 9p | B+R | |
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| [1981-06-11] 20th Japanese Judan, loser section round 1
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| Kato Masao 9p | Kobayashi Koichi 9p | B+4.5 | |
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| [1980-02-14] 5th Japanese Meijin, league
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| Kobayashi Koichi 9p | Kato Masao 9p | W+6.5 | |
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| [1979-10-04] 27th Japanese Oza, challenger decision match
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| Kobayashi Koichi 9p | Kato Masao 9p | W+R | |
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| [1978-10-28] 1st Japan Asia Airways Cup, round 2
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| Kobayashi Koichi 8p | Kato Masao 9p | B+R | |
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| [1978-10-19] 4th Japanese Tengen, semi-final
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| Kato Masao 9p | Kobayashi Koichi 8p | B+R | |
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| [1976-08-19] 1st Japanese Kisei
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| Kobayashi Koichi 7p | Kato Masao 8p | W+R | |
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| [1976-02-08] 1st Japanese Gosei, league
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| Kobayashi Koichi 7p | Kato Masao 8p | W+R | |
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| [1975-08-31] 7th Japanese Shinei Tournament, final
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| Kobayashi Koichi 7p | Kato Masao 8p | B+5.5 | |
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| [1975-03-20] 12th Japanese Pro Best Ten, semi-final
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| Kato Masao 8p | Kobayashi Koichi 7p | B+R | |
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| [1973-12-30] 21st Japanese NHK Cup, round 2
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| Kobayashi Koichi 6p | Kato Masao 8p | W+R | |
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