| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. G Johnson vs Karen Hoshino |
| 0-1 | 60 | 2018 | Batumi Olympiad (Women) | B22 Sicilian, Alapin |
| 27. Karen Hoshino vs Y H Liu |
| ½-½ | 34 | 2018 | Batumi Olympiad (Women) | A65 Benoni, 6.e4 |
| 28. A von Erichsen vs Karen Hoshino |
| ½-½ | 25 | 2018 | Batumi Olympiad (Women) | B23 Sicilian, Closed |
| 29. Karen Hoshino vs H Goossens |
| 0-1 | 47 | 2018 | Batumi Olympiad (Women) | E46 Nimzo-Indian |
| 30. Karen Hoshino vs Sbai Rania |
| ½-½ | 40 | 2018 | Batumi Olympiad (Women) | D47 Queen's Gambit Declined Semi-Slav |
| 31. D Mirza vs Karen Hoshino |
| ½-½ | 28 | 2018 | Batumi Olympiad (Women) | B22 Sicilian, Alapin |
| 32. Karen Hoshino vs Hoi Yau Ashley Cheung |
| 1-0 | 50 | 2020 | FIDE Online Olympiad | D06 Queen's Gambit Declined |
| 33. M Yazji vs Karen Hoshino |
| ½-½ | 40 | 2020 | FIDE Online Olympiad | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 34. Karen Hoshino vs A O'Gorman |
| 0-1 | 71 | 2020 | FIDE Online Olympiad | D47 Queen's Gambit Declined Semi-Slav |
| 35. P R F Azhar vs Karen Hoshino |
| 0-1 | 35 | 2020 | FIDE Online Olympiad | A07 King's Indian Attack |
| 36. Karen Hoshino vs A Shabanaj |
| ½-½ | 42 | 2020 | FIDE Online Olympiad | E81 King's Indian, Samisch |
| 37. I Y Ning vs Karen Hoshino |
| 0-1 | 44 | 2020 | FIDE Online Olympiad | E20 Nimzo-Indian |
| 38. Karen Hoshino vs Taegyeong Kim |
| ½-½ | 32 | 2020 | FIDE Online Olympiad | D31 Queen's Gambit Declined |
| 39. Karen Hoshino vs M Dubois |
| 1-0 | 22 | 2020 | FIDE Online Olympiad | D20 Queen's Gambit Accepted |
| 40. K Fang vs Karen Hoshino |
| 1-0 | 53 | 2020 | FIDE Online Olympiad | B92 Sicilian, Najdorf, Opocensky Variation |
| 41. Karen Hoshino vs W Graif |
| 0-1 | 31 | 2022 | Pan-American Intercollegiate Team Championship | E46 Nimzo-Indian |
| 42. Rannon Huo vs Karen Hoshino |
| ½-½ | 58 | 2022 | Pan-American Intercollegiate Team Championship | E00 Queen's Pawn Game |
| 43. Karen Hoshino vs A Kryazhev |
| ½-½ | 93 | 2022 | Pan-American Intercollegiate Team Championship | D63 Queen's Gambit Declined, Orthodox Defense |
| 44. Karen Hoshino vs S P Rahul |
| 0-1 | 36 | 2022 | Pan-American Intercollegiate Team Championship | E81 King's Indian, Samisch |
Kibitzing
