| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. J Krivec vs Karen Hoshino |
| 1-0 | 25 | 2014 | Tromso Olympiad (Women) | B23 Sicilian, Closed |
| 2. Karen Hoshino vs W Atthaworadej |
| 1-0 | 37 | 2014 | Tromso Olympiad (Women) | D87 Grunfeld, Exchange |
| 3. A Soondarsingh vs Karen Hoshino |
| 0-1 | 28 | 2014 | Tromso Olympiad (Women) | B21 Sicilian, 2.f4 and 2.d4 |
| 4. Karen Hoshino vs E Reppen |
| 0-1 | 62 | 2014 | Tromso Olympiad (Women) | D87 Grunfeld, Exchange |
| 5. Karen Hoshino vs M Stojkovska |
| 0-1 | 58 | 2014 | Tromso Olympiad (Women) | E33 Nimzo-Indian, Classical |
| 6. C Mencos vs Karen Hoshino |
| 1-0 | 80 | 2014 | Tromso Olympiad (Women) | B92 Sicilian, Najdorf, Opocensky Variation |
| 7. T S Tchouateu vs Karen Hoshino |
| 0-1 | 52 | 2014 | Tromso Olympiad (Women) | B50 Sicilian |
| 8. Karen Hoshino vs Hakyung Lim |
| ½-½ | 42 | 2014 | Tromso Olympiad (Women) | D50 Queen's Gambit Declined |
| 9. A Z Salim-Moussa vs Karen Hoshino |
| 0-1 | 22 | 2014 | Tromso Olympiad (Women) | B50 Sicilian |
| 10. Karen Hoshino vs G Melnik |
| 0-1 | 75 | 2014 | Tromso Olympiad (Women) | D31 Queen's Gambit Declined |
| 11. Karen Hoshino vs Riya Shah |
| ½-½ | 38 | 2014 | Tromso Olympiad (Women) | D36 Queen's Gambit Declined, Exchange, Positional line, 6.Qc2 |
| 12. K Abdulla vs Karen Hoshino |
| 1-0 | 39 | 2016 | Baku Olympiad (Women) | B92 Sicilian, Najdorf, Opocensky Variation |
| 13. Karen Hoshino vs H Puuska |
| 1-0 | 48 | 2016 | Baku Olympiad (Women) | E32 Nimzo-Indian, Classical |
| 14. A Albzoor vs Karen Hoshino |
| 0-1 | 46 | 2016 | Baku Olympiad (Women) | A13 English |
| 15. Karen Hoshino vs A Aleksandrova |
| 0-1 | 69 | 2016 | Baku Olympiad (Women) | D50 Queen's Gambit Declined |
| 16. Karen Hoshino vs L Acevedo Mendez |
| 1-0 | 31 | 2016 | Baku Olympiad (Women) | A90 Dutch |
| 17. Anviti Adhin vs Karen Hoshino |
| ½-½ | 41 | 2016 | Baku Olympiad (Women) | A22 English |
| 18. Karen Hoshino vs Donna Murray |
| 1-0 | 45 | 2016 | Baku Olympiad (Women) | E81 King's Indian, Samisch |
| 19. A Jehad vs Karen Hoshino |
| 0-1 | 70 | 2016 | Baku Olympiad (Women) | B01 Scandinavian |
| 20. Karen Hoshino vs Y Yuan |
| 0-1 | 33 | 2016 | Baku Olympiad (Women) | E11 Bogo-Indian Defense |
| 21. T G Nguyen vs Karen Hoshino |
| 0-1 | 37 | 2016 | Baku Olympiad (Women) | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 22. Karen Hoshino vs Y Shvayger |
| 0-1 | 34 | 2018 | Batumi Olympiad (Women) | E87 King's Indian, Samisch, Orthodox |
| 23. A O Mena vs Karen Hoshino |
| ½-½ | 42 | 2018 | Batumi Olympiad (Women) | D02 Queen's Pawn Game |
| 24. Karen Hoshino vs A Samaganova |
| 0-1 | 40 | 2018 | Batumi Olympiad (Women) | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 25. Sylviane Kouokam Magne vs Karen Hoshino |
| 0-1 | 44 | 2018 | Batumi Olympiad (Women) | E12 Queen's Indian |
Kibitzing
