| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 51. A Brikers vs A Ostrovskiy |
| 0-1 | 35 | 2019 | Riga Tech Open-A | B13 Caro-Kann, Exchange |
| 52. A Ostrovskiy vs V Nevednichy |
| 0-1 | 49 | 2019 | Riga Tech Open-A | C01 French, Exchange |
| 53. D Wagner vs A Ostrovskiy |
| 1-0 | 44 | 2019 | Riga Tech Open-A | A07 King's Indian Attack |
| 54. A Saveliev vs A Ostrovskiy |
| 1-0 | 49 | 2019 | Riga Tech Open-A | B13 Caro-Kann, Exchange |
| 55. A Ostrovskiy vs Niemann |
 | 0-1 | 28 | 2020 | CCCSA Fall GM | C55 Two Knights Defense |
| 56. B Jacobson vs A Ostrovskiy |
| 1-0 | 35 | 2020 | CCCSA Thanksgiving GM | B12 Caro-Kann Defense |
| 57. B Daggupati vs A Ostrovskiy |
| ½-½ | 37 | 2021 | CCCSA Winter GM | C18 French, Winawer |
| 58. A Ostrovskiy vs V Belous |
| 0-1 | 38 | 2021 | CCCSA Winter GM | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 59. A Shetty vs A Ostrovskiy |
| ½-½ | 58 | 2021 | CCCSA Winter GM | A11 English, Caro-Kann Defensive System |
| 60. A Ostrovskiy vs T Ringoir |
| ½-½ | 72 | 2021 | CCCSA Winter GM | C48 Four Knights |
| 61. A Guo vs A Ostrovskiy |
| ½-½ | 25 | 2021 | CCCSA Winter GM | C09 French, Tarrasch, Open Variation, Main line |
| 62. A Ostrovskiy vs S Gauri |
| ½-½ | 52 | 2021 | CCCSA Winter GM | C67 Ruy Lopez |
| 63. Mishra vs A Ostrovskiy |
| 0-1 | 90 | 2021 | CCCSA Winter GM | C11 French |
| 64. A Mista vs A Ostrovskiy |
| ½-½ | 46 | 2021 | CCCSA Winter GM | B15 Caro-Kann |
| 65. A Ostrovskiy vs Z Javakhadze |
| ½-½ | 5 | 2021 | CCCSA Winter GM | C49 Four Knights |
| 66. Mishra vs A Ostrovskiy |
| ½-½ | 38 | 2021 | Charlotte Spring GM | D10 Queen's Gambit Declined Slav |
| 67. A Ostrovskiy vs S Sinha |
| ½-½ | 21 | 2021 | Charlotte Spring GM | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 68. P Prohaszka vs A Ostrovskiy |
| 1-0 | 47 | 2021 | Charlotte Spring GM | D10 Queen's Gambit Declined Slav |
| 69. A Ostrovskiy vs S Gauri |
| ½-½ | 22 | 2021 | Charlotte Spring GM | C60 Ruy Lopez |
| 70. C Hilby vs A Ostrovskiy |
| 0-1 | 49 | 2021 | Charlotte Spring GM | D17 Queen's Gambit Declined Slav |
| 71. K Wang vs A Ostrovskiy |
| ½-½ | 20 | 2021 | Charlotte Spring GM | B10 Caro-Kann |
| 72. A Ostrovskiy vs C Yip |
| 0-1 | 61 | 2021 | Charlotte Spring GM | C78 Ruy Lopez |
| 73. V Belous vs A Ostrovskiy |
| 1-0 | 32 | 2021 | Charlotte Spring GM | D15 Queen's Gambit Declined Slav |
| 74. A Ostrovskiy vs T Ringoir |
| ½-½ | 8 | 2021 | Charlotte Spring GM | C48 Four Knights |
| 75. A Ostrovskiy vs Niemann |
| 0-1 | 48 | 2021 | National Open | A13 English |
Kibitzing
