Games Between Two Players
O Rissei (6 win; 0 loss) vs. Oya Koichi
| Game Date and Game Description | |||||
| Black | White | Result | Replay | Download | |
 [2004-07-15] 11th Japanese Agon Cup, round 1
|
|||||
| Oya Koichi 9p | O Rissei 9p | W+1.5 |  |
 |
 |
| [2003-12-01] 29th Japanese Gosei, round 1
|
|||||
| Oya Koichi 9p | O Rissei 9p | W+5.5 | |
|
|
| [2003-04-07] 12th Japanese Ryusei, group stage
|
|||||
| O Rissei 9p | Oya Koichi 9p | B+5.5 | |
|
|
| [1998-09-17] 46th Japanese Oza, challenger decision match
|
|||||
| Oya Koichi 8p | O Rissei 9p | W+1.5 | |
|
|
| [1992-05-21] 31st Japanese Judan, winner section round 1
|
|||||
| O Rissei 9p | Oya Koichi 7p | B+R | |
|
|
| [1986-07-24] 11th Japanese Shinjin O, semi-final
|
|||||
| O Rissei 8p | Oya Koichi 5p | B+R | |
|
|
