| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. A Ostrovskiy vs J G Ludwig |
| ½-½ | 41 | 2018 | CCCSA Summer GMA | B07 Pirc |
| 27. A Ostrovskiy vs B Jacobson |
| ½-½ | 27 | 2018 | 11th NY International - Championship | B18 Caro-Kann, Classical |
| 28. B Daggupati vs A Ostrovskiy |
| 0-1 | 55 | 2018 | 11th NY International - Championship | B12 Caro-Kann Defense |
| 29. A Ostrovskiy vs J Burke |
| ½-½ | 31 | 2018 | 11th NY International - Championship | C50 Giuoco Piano |
| 30. M Rohde vs A Ostrovskiy |
| ½-½ | 41 | 2018 | 11th NY International - Championship | A07 King's Indian Attack |
| 31. A Ostrovskiy vs N Nestorovic |
| ½-½ | 23 | 2018 | 11th NY International - Championship | B31 Sicilian, Rossolimo Variation |
| 32. D Brodsky vs A Ostrovskiy |
| ½-½ | 44 | 2018 | 11th NY International - Championship | B12 Caro-Kann Defense |
| 33. S Pozo Vera vs A Ostrovskiy |
| ½-½ | 16 | 2018 | 11th NY International - Championship | D44 Queen's Gambit Declined Semi-Slav |
| 34. A Ostrovskiy vs K S Yap |
| ½-½ | 32 | 2018 | 11th NY International - Championship | B30 Sicilian |
| 35. L Rozman vs A Ostrovskiy |
| ½-½ | 12 | 2018 | Montreal Summer IM | C42 Petrov Defense |
| 36. T Gareyev vs A Ostrovskiy |
| 1-0 | 31 | 2018 | UT Dallas Fall Open | D30 Queen's Gambit Declined |
| 37. B Jacobson vs A Ostrovskiy |
| ½-½ | 59 | 2018 | 102nd ch-Marshall CC | E04 Catalan, Open, 5.Nf3 |
| 38. A Ostrovskiy vs P Nagarajan |
| 1-0 | 41 | 2019 | Bay Area International Open | C50 Giuoco Piano |
| 39. L Bruzon Batista vs A Ostrovskiy |
| 1-0 | 34 | 2019 | Bay Area International Open | E53 Nimzo-Indian, 4.e3 |
| 40. A Ostrovskiy vs D O'Connor |
| 1-0 | 26 | 2019 | Bay Area International Open | C50 Giuoco Piano |
| 41. F Ynojosa Aponte vs A Ostrovskiy |
| 1-0 | 45 | 2019 | Bay Area International Open | A28 English |
| 42. A Ostrovskiy vs N Kumar |
| 1-0 | 47 | 2019 | Bay Area International Open | C50 Giuoco Piano |
| 43. J D Williams vs A Ostrovskiy |
| ½-½ | 30 | 2019 | Bay Area International Open | A06 Reti Opening |
| 44. A Ostrovskiy vs A Jacobson |
| 1-0 | 63 | 2019 | Bay Area International Open | C09 French, Tarrasch, Open Variation, Main line |
| 45. A Ostrovskiy vs K Kiewra |
| ½-½ | 29 | 2019 | Bay Area International Open | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 46. K Dragun vs A Ostrovskiy |
| ½-½ | 35 | 2019 | Bay Area International Open | A09 Reti Opening |
| 47. B Jacobson vs A Ostrovskiy |
| ½-½ | 13 | 2019 | CCCSA Winter GM | C92 Ruy Lopez, Closed |
| 48. A Ostrovskiy vs B Jacobson |
| 1-0 | 43 | 2019 | CCCSA Spring GM | B31 Sicilian, Rossolimo Variation |
| 49. A Ostrovskiy vs B Jacobson |
| 1-0 | 33 | 2019 | CCCSA Summer A GM | B13 Caro-Kann, Exchange |
| 50. C Bauer vs A Ostrovskiy |
| 1-0 | 42 | 2019 | Riga Tech Open-A | B12 Caro-Kann Defense |
Kibitzing
