| May 19, 2026 | Nagy | ½–½ | Ostrovskiy | Round 9: Nagy, Gabor - Ostrovskiy, Aleksandr | Slav Defense: Exchange Variation | |
| May 18, 2026 | Ostrovskiy | 1–0 | Chinguun | Round 8: Ostrovskiy, Aleksandr - Chinguun, Sumiya | Sicilian Defense: Najdorf Variation, Amsterdam Variation | |
| May 17, 2026 | Aarav Sinha | 0–1 | Ostrovskiy | Round 6: Aarav Sinha - Ostrovskiy, Aleksandr | Queen's Gambit Declined: Westphalian Variation | |
| May 16, 2026 | Ostrovskiy | 1–0 | Berczes | Round 5: Ostrovskiy, Aleksandr - Berczes, David | French Defense: Steinitz Variation, Boleslavsky Variation | |
| May 16, 2026 | Grieve | 1–0 | Ostrovskiy | Round 4: Grieve, Harry - Ostrovskiy, Aleksandr | Ruy Lopez: Fianchetto Defense | |
| May 15, 2026 | Ostrovskiy | ½–½ | Mungunzul | Round 3: Ostrovskiy, Aleksandr - Mungunzul, Bat-Erdene | Ruy Lopez: Closed, Martinez Variation | |
| May 15, 2026 | Aveskulov | 1–0 | Ostrovskiy | Sixday 2026 May GM-A | Ruy Lopez: Morphy Defense, Cozio Defense | |
| May 14, 2026 | Ostrovskiy | ½–½ | Palczert | Sixday 2026 May GM-A | English Opening: Anglo-Indian Defense, King's Knight Variation | |
| May 13, 2026 | Ostrovskiy | 1–0 | Ruzhansky | Round 7: Ostrovskiy, Aleksandr - Ruzhansky, Elias | Sicilian Defense: Classical Variation | |
| Apr 9, 2026 | Illescas Cordoba | 1–0 | Ostrovskiy | Round 5: Illescas Cordoba, Miguel - Ostrovskiy, Aleksandr | Four Knights Game: Spanish Variation, Symmetrical Variation | |
| Apr 6, 2026 | Moral Garcia | 1–0 | Ostrovskiy | X Open Semana Santa 2026 - Grupo A | English Opening: Agincourt Defense | |
| Mar 1, 2026 | Boyer | 0–1 | Ostrovskiy | Saint Louis Masters | Caro-Kann Defense: Advance Variation, Short Variation | |
| Feb 28, 2026 | Ostrovskiy | ½–½ | Repka | Saint Louis Masters | Ruy Lopez: Morphy Defense, Steinitz Deferred | |
| Feb 28, 2026 | Kevlishvili | 1–0 | Ostrovskiy | Saint Louis Masters | Queen's Pawn Game: London System | |
| Feb 27, 2026 | Ostrovskiy | 1–0 | Kuru | Saint Louis Masters | Philidor Defense: Lion Variation | |
| Feb 27, 2026 | Ostrovskiy | ½–½ | Gazik | Saint Louis Masters | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Feb 26, 2026 | Bok | ½–½ | Ostrovskiy | Saint Louis Masters | King's Indian Attack, with e6 | |
| Feb 26, 2026 | Yip | 0–1 | Ostrovskiy | Saint Louis Masters | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Feb 25, 2026 | Ostrovskiy | 0–1 | Putnam | Saint Louis Masters | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Feb 25, 2026 | Alexakis | 1–0 | Ostrovskiy | Saint Louis Masters | French Defense: Winawer Variation, Retreat Variation, Armenian Line | |
| Dec 20, 2025 | Ostrovskiy | ½–½ | Perez Gormaz | Round 9: Ostrovskiy, Aleksandr - Perez Gormaz, Matias | French Defense: Exchange Variation | |
| Dec 20, 2025 | Ostrovskiy | 1–0 | Diaz Rosas | Round 7: Ostrovskiy, Aleksandr - Diaz Rosas, Julio Cesar | French Defense: Exchange Variation | |
| Dec 20, 2025 | Barrientos | 0–1 | Ostrovskiy | Round 6: Barrientos, Sergio E - Ostrovskiy, Aleksandr | Scandinavian Defense: Modern Variation | |
| Dec 20, 2025 | Ostrovskiy | ½–½ | Martinez Duany | Round 5: Ostrovskiy, Aleksandr - Martinez Duany, Lelys Stanley | Sicilian Defense: Closed, Traditional | |
| Dec 20, 2025 | Del Carpio Gallegos | 0–1 | Ostrovskiy | Round 4: Del Carpio Gallegos, Gonzalo - Ostrovskiy, Aleksandr | Indian Defense: Budapest Defense, Adler Variation | |
| Dec 19, 2025 | Ostrovskiy | 1–0 | Castellanos Hernandez | Round 3: Ostrovskiy, Aleksandr - Castellanos Hernandez, Lhia Itzayana | Queen's Pawn Game: Accelerated London System | |
| Dec 19, 2025 | Mendez Tovar | 0–1 | Ostrovskiy | Round 2: Mendez Tovar, Yessica Yissel - Ostrovskiy, Aleksandr | Indian Defense: Budapest Defense, Adler Variation | |
| Dec 19, 2025 | Ostrovskiy | 1–0 | Salazar Dominguez | Round 1: Ostrovskiy, Aleksandr - Salazar Dominguez, Axel Hiram | Queen's Pawn Game: Accelerated London System | |
| Dec 19, 2025 | Quesada Perez | 1–0 | Ostrovskiy | Round 8: Quesada Perez, Luis Ernesto - Ostrovskiy, Aleksandr | King's Indian Attack | |
| Dec 19, 2025 | Ostrovskiy | ½–½ | Perez Garcia | Round 9: Ostrovskiy, Aleksandr - Perez Garcia, Rodney Oscar | Ruy Lopez: Classical Variation, Central Variation | |
| Dec 18, 2025 | Borges Matos | 1–0 | Ostrovskiy | Round 8: Borges Matos, Juan - Ostrovskiy, Aleksandr | English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, with Nb6 | |
| Dec 18, 2025 | Ostrovskiy | ½–½ | Bilovil | Round 7: Ostrovskiy, Aleksandr - Bilovil, Bogdan | French Defense: Classical Variation, Shirov-Anand Variation | |
| Dec 17, 2025 | Diaz Perez | ½–½ | Ostrovskiy | Round 6: Diaz Perez, Michel Alejandro - Ostrovskiy, Aleksandr | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Dec 17, 2025 | Ostrovskiy | ½–½ | Gonzalez Zamora | Round 5: Ostrovskiy, Aleksandr - Gonzalez Zamora, Juan Carlos | Sicilian Defense: Richter-Rauzer Variation, Vitolins Variation | |
| Dec 16, 2025 | Matviishen | 1–0 | Ostrovskiy | Round 4: Matviishen, Viktor - Ostrovskiy, Aleksandr | Queen's Gambit Accepted: Janowski-Larsen Variation | |
| Dec 16, 2025 | Ostrovskiy | 1–0 | Martinez Duany | Round 3: Ostrovskiy, Aleksandr - Martinez Duany, Lelys Stanley | Ruy Lopez: Closed, Martinez Variation | |
| Dec 15, 2025 | Barrientos | 0–1 | Ostrovskiy | Round 2: Barrientos, Sergio E - Ostrovskiy, Aleksandr | Queen's Gambit Declined | |
| Nov 16, 2025 | Ostrovskiy | 0–1 | Hjartarson | Icelandic team chess championship premier league | Alekhine Defense: Exchange Variation | |
| Nov 15, 2025 | Hardaway | ½–½ | Ostrovskiy | Icelandic team chess championship premier league | French Defense: Tarrasch Variation, Open System, Main Line | |
| Nov 15, 2025 | Thorhallsson | 0–1 | Ostrovskiy | Icelandic team chess championship premier league | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Nov 14, 2025 | Ostrovskiy | ½–½ | Jakubiec | Icelandic team chess championship premier league | Sicilian Defense: Kan Variation, Maróczy Bind, Réti Variation | |
| Nov 13, 2025 | Berczes | ½–½ | Ostrovskiy | SixDays November 2025 GM-B | Slav Defense | |
| Nov 12, 2025 | Ostrovskiy | ½–½ | Binu | SixDays November 2025 GM-B | Zukertort Opening | |
| Nov 12, 2025 | Putnam | 1–0 | Ostrovskiy | SixDays November 2025 GM-B | Caro-Kann Defense: Classical Variation, Main Line | |
| Nov 11, 2025 | Ostrovskiy | 1–0 | Kairbekova | SixDays November 2025 GM-B | Sicilian Defense: Taimanov Variation | |
| Nov 10, 2025 | Kolimar | 1–0 | Ostrovskiy | SixDays November 2025 GM-B | Catalan Opening: Closed | |
| Nov 10, 2025 | Ostrovskiy | ½–½ | Apaar Saxena | SixDays November 2025 GM-B | Italian Game: Giuoco Pianissimo, Normal | |
| Nov 9, 2025 | Hera | 1–0 | Ostrovskiy | SixDays November 2025 GM-B | Caro-Kann Defense: Tartakower Variation | |
| Nov 9, 2025 | Ostrovskiy | ½–½ | Pap | SixDays November 2025 GM-B | Ruy Lopez: Morphy Defense, Cozio Defense | |
| Nov 6, 2025 | Ostrovskiy | 0–1 | Patrelakis | SixDays November 2025 GM-B | French Defense: Winawer Variation, Alekhine-Maróczy Gambit | |
| Oct 26, 2025 | Kung | 0–1 | Ostrovskiy | Round 5: Kung, Thomas - Ostrovskiy, Aleksandr | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Oct 26, 2025 | Ostrovskiy | 1–0 | Hill | Round 4: Ostrovskiy, Aleksandr - Hill, Brad W | English Opening: King's English Variation, Four Knights Variation, Quiet Line | |
| Oct 25, 2025 | Panda | ½–½ | Ostrovskiy | Round 3: Panda, Vedic - Ostrovskiy, Aleksandr | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Oct 25, 2025 | Ostrovskiy | ½–½ | Fishbein | Round 2: Ostrovskiy, Aleksandr - Fishbein, Mitch | Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | |
| Oct 24, 2025 | Laureano | 0–1 | Ostrovskiy | Round 1: Laureano, Dereck - Ostrovskiy, Aleksandr | Queen's Pawn Game: Accelerated London System, Steinitz Countergambit | |
| Jun 30, 2025 | Ostrovskiy | * | Sammons | 18th Annual Philadephia International | ? | |
| Jun 29, 2025 | Liang | 1–0 | Ostrovskiy | Round 7: Liang, Awonder - Ostrovskiy, Aleksandr | Caro-Kann Defense: Breyer Variation | |
| Jun 28, 2025 | Ostrovskiy | * | Pressman | 18th Annual Philadephia International | ? | |
| Apr 27, 2025 | Albornoz Cabrera | * | Ostrovskiy | Round 9: Albornoz Cabrera, Carlos Daniel - Ostrovskiy, Aleksandr | ? | |
| Apr 26, 2025 | Ostrovskiy | 0–1 | Woodward | Round 8: Ostrovskiy, Aleksandr - Woodward, Andy | Sicilian Defense: Najdorf Variation, English Attack | |
| Apr 26, 2025 | Vogel | 0–1 | Ostrovskiy | Round 7: Vogel, Roven - Ostrovskiy, Aleksandr | Nimzo-Larsen Attack: Classical Variation | |
| Apr 25, 2025 | Ostrovskiy | * | Klimkowski | Round 6: Ostrovskiy, Aleksandr - Klimkowski, Jan | ? | |
| Apr 24, 2025 | Ostrovskiy | 0–1 | Sosa | Round 4: Ostrovskiy, Aleksandr - Sosa, Tomas | Sicilian Defense: Hyperaccelerated Dragon | |
| Apr 20, 2025 | Sriansh Das | 1–0 | Ostrovskiy | Semana Santa A. 2025 | Caro-Kann Defense: Tartakower Variation | |
| Apr 19, 2025 | Diaz Camallonga | 1–0 | Ostrovskiy | Semana Santa A. 2025 | Caro-Kann Defense: Two Knights Attack | |
| Mar 29, 2025 | Ostrovskiy | ½–½ | Uskov | SixDays Budapest March 2025 GM A | Sicilian Defense: Moscow Variation | |
| Mar 28, 2025 | Ostrovskiy | 0–1 | Rohrer | SixDays Budapest March 2025 GM A | Ruy Lopez: Morphy Defense, Modern Steinitz Defense | |
| Mar 28, 2025 | Pap | ½–½ | Ostrovskiy | SixDays Budapest March 2025 GM A | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Mar 27, 2025 | Moldagali | 1–0 | Ostrovskiy | SixDays Budapest March 2025 GM A | French Defense: Steinitz Variation, Boleslavsky Variation | |
| Mar 26, 2025 | Ostrovskiy | ½–½ | Aczel | SixDays Budapest March 2025 GM A | Sicilian Defense: Najdorf Variation, English Attack | |
| Mar 26, 2025 | Borgaonkar Akshay | 1–0 | Ostrovskiy | SixDays Budapest March 2025 GM A | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Mar 25, 2025 | Ostrovskiy | 0–1 | Zia | SixDays Budapest March 2025 GM A | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Mar 25, 2025 | Berczes | ½–½ | Ostrovskiy | SixDays Budapest March 2025 GM A | Bogo-Indian Defense: Retreat Variation | |
| Mar 24, 2025 | Jake Shanty | 0–1 | Ostrovskiy | SixDays Budapest March 2025 GM A | Queen's Gambit Declined: Three Knights, Vienna Variation | |
| Jan 20, 2025 | Ostrovskiy | ½–½ | Schnaider | Round 9: Ostrovskiy, Aleksandr - Schnaider, Ilan | Sicilian Defense: Moscow Variation, Main Line | |
| Jan 20, 2025 | Kevlishvili | ½–½ | Ostrovskiy | Round 8: Kevlishvili, Robby - Ostrovskiy, Aleksandr | Caro-Kann Defense: Advance Variation, Van der Wiel Attack | |
| Jan 19, 2025 | Ostrovskiy | ½–½ | Cordova | Round 7: Ostrovskiy, Aleksandr - Cordova, Emilio | French Defense: Steinitz Variation, Boleslavsky Variation | |
| Jan 19, 2025 | Mardov | 1–0 | Ostrovskiy | Round 6: Mardov, Dimitar - Ostrovskiy, Aleksandr | English Opening: Agincourt Defense, Wimpy System | |
| Jan 18, 2025 | Ostrovskiy | 0–1 | Park | Round 4: Ostrovskiy, Aleksandr - Park, Evan | Zukertort Opening | |
| Jan 18, 2025 | Escobar Forero | ½–½ | Ostrovskiy | Round 5: Escobar Forero, Alder - Ostrovskiy, Aleksandr | Caro-Kann Defense: Tartakower Variation | |
| Jan 17, 2025 | Ostrovskiy | ½–½ | Shlyakhtenko | Round 2: Ostrovskiy, Aleksandr - Shlyakhtenko, Robert | Sicilian Defense: Delayed Alapin Variation | |
| Jan 17, 2025 | Katz | 1–0 | Ostrovskiy | Round 3: Katz, Alexander - Ostrovskiy, Aleksandr | Caro-Kann Defense: Advance Variation | |
| Jan 16, 2025 | Chasin | 1–0 | Ostrovskiy | Round 1: Chasin, Nico - Ostrovskiy, Aleksandr | King's Indian Attack | |
| Dec 18, 2024 | Ostrovskiy | ½–½ | Ruiz Castillo | Ronda 9: Ostrovskiy, Aleksandr - Ruiz Castillo, Joshua Daniel | Queen's Pawn Game: Accelerated London System | |
| Dec 18, 2024 | Ostrovskiy | 1–0 | Lopez Raygoza | Ronda 8: Ostrovskiy, Aleksandr - Lopez Raygoza, Luis Alberto | Queen's Pawn Game: Accelerated London System | |
| Dec 18, 2024 | Vargas Segura | 0–1 | Ostrovskiy | Ronda 7: Vargas Segura, Ivan Albert - Ostrovskiy, Aleksandr | Caro-Kann Defense | |
| Dec 18, 2024 | Ostrovskiy | 1–0 | Pagan | Ronda 6: Ostrovskiy, Aleksandr - Pagan, Jonathan | Four Knights Game: Spanish Variation | |
| Dec 18, 2024 | Albornoz Cabrera | 1–0 | Ostrovskiy | Ronda 5: Albornoz Cabrera, Carlos Daniel - Ostrovskiy, Aleksandr | Sicilian Defense: Dragon Variation | |
| Dec 18, 2024 | Ostrovskiy | 1–0 | Orta Ruz | Ronda 4: Ostrovskiy, Aleksandr - Orta Ruz, Andre Fernando | Sicilian Defense: Closed, Traditional | |
| Dec 18, 2024 | Cepero Lopez | 0–1 | Ostrovskiy | Ronda 3: Cepero Lopez, Amy Ashley - Ostrovskiy, Aleksandr | Scandinavian Defense: Portuguese Gambit, Wuss Variation | |
| Dec 18, 2024 | Ostrovskiy | 1–0 | Reyes Serrano | Ronda 2: Ostrovskiy, Aleksandr - Reyes Serrano, Jose de Jesus | Queen's Pawn Game: Accelerated London System, Steinitz Countergambit | |
| Dec 18, 2024 | Medina Baeza | 0–1 | Ostrovskiy | Ronda 1: Medina Baeza, Yongsu Renan - Ostrovskiy, Aleksandr | Queen's Pawn Game: Colle System | |
| Dec 18, 2024 | Martinez Duany | ½–½ | Ostrovskiy | Ronda 9: Martinez Duany, Lelys Stanley - Ostrovskiy, Aleksandr | Queen's Gambit Declined: Ragozin Defense | |
| Dec 17, 2024 | Ostrovskiy | ½–½ | Zacarias Rodriguez | Ronda 8: Ostrovskiy, Aleksandr - Zacarias Rodriguez, Santiago | Sicilian Defense: Modern Variations, Main Line | |
| Dec 17, 2024 | Otero Acosta | ½–½ | Ostrovskiy | Ronda 7: Otero Acosta, Diasmany - Ostrovskiy, Aleksandr | Queen's Gambit Declined | |
| Dec 16, 2024 | Ostrovskiy | 0–1 | Berdayes Ason | Ronda 6: Ostrovskiy, Aleksandr - Berdayes Ason, Dylan Isidro | Sicilian Defense: Moscow Variation, Main Line | |
| Dec 16, 2024 | Ruiz Castillo | ½–½ | Ostrovskiy | Ronda 5: Ruiz Castillo, Joshua Daniel - Ostrovskiy, Aleksandr | Nimzo-Larsen Attack: Modern Variation | |
| Dec 15, 2024 | Ostrovskiy | 1–0 | Caballero Ramos | Ronda 4: Ostrovskiy, Aleksandr - Caballero Ramos, Greter | French Defense: Winawer Variation, Advance Variation | |
| Dec 14, 2024 | Gonzalez Tun | 0–1 | Ostrovskiy | Ronda 3: Gonzalez Tun, Aaron - Ostrovskiy, Aleksandr | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Dec 14, 2024 | Ostrovskiy | 0–1 | Cori | Ronda 2: Ostrovskiy, Aleksandr - Cori, Jorge | Four Knights Game: Scotch Variation Accepted | |