Games Between Two Players
O Rissei (1 win; 2 loss) vs. Koyama Kuya
| Game Date and Game Description | |||||
| Black | White | Result | Replay | Download | |
 [2026-04-26] 74th Japanese NHK Cup, round 1
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| Koyama Kuya 7p | O Rissei 9p | B+R |  |
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| [2023-04-20] 48th Japanese Kisei, preliminary
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| O Rissei 9p | Koyama Kuya 5p | W+R | |
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| [2015-11-12] 64th Japanese Oza, preliminary
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| Koyama Kuya 2p | O Rissei 9p | W+R | |
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