Games Between Two Players
O Rissei (1 win; 1 loss) vs. Koyama Shizuo
| Game Date and Game Description | |||||
| Black | White | Result | Replay | Download | |
 [1980-11-26] 25th Japanese Prime Minister's Cup, round 2
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| Koyama Shizuo 6p | O Rissei 5p | W+4.5 |  |
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| [1978-12-13] 23rd Japanese Prime Minister's Cup, round 1
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| O Rissei 5p | Koyama Shizuo 6p | W+R | |
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