| — | Kosteniuk | 1–0 | Ovod | WRBC 2022. Rapid Women | Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | |
| — | Kosteniuk | 0–1 | Kovanova | WRBC 2022. Blitz Women | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| — | Kosteniuk | 1–0 | Lu | WRBC 2022. Blitz Women | Sicilian Defense: Alapin Variation, Stoltz Attack | |
| — | Kosteniuk | 1–0 | Tania | WRBC 2022. Blitz Women | King's Indian Attack: Keres Variation | |
| — | Kosteniuk | 1–0 | Javakhishvili | WRBC 2022. Blitz Women | Modern Defense: Standard Defense | |
| — | Kosteniuk | 1–0 | Lagno | WRBC 2022. Blitz Women | Italian Game: Scotch Invitation Declined | |
| — | Kosteniuk | 0–1 | Khademalsharieh | WRBC 2022. Blitz Women | Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | |
| — | Kosteniuk | 1–0 | Omonova | WRBC 2022. Blitz Women | Sicilian Defense: Alapin Variation, Barmen Defense | |
| — | Kosteniuk | 0–1 | Assaubayeva | WRBC 2022. Blitz Women | Sicilian Defense: Alapin Variation, Barmen Defense | |
| — | Gaponenko | 0–1 | Kosteniuk | WRBC 2022. Rapid Women | Ruy Lopez: Exchange Variation, Normal Variation | |
| — | Nurgali | 0–1 | Kosteniuk | WRBC 2022. Blitz Women | Dutch Defense: Leningrad Variation | |
| — | Garifullina | 0–1 | Kosteniuk | WRBC 2022. Blitz Women | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| — | Nakhbayeva | 0–1 | Kosteniuk | WRBC 2022. Blitz Women | Dutch Defense: Queen's Knight Variation | |
| — | Munkhzul | 0–1 | Kosteniuk | WRBC 2022. Blitz Women | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| — | Gunina | 1–0 | Kosteniuk | WRBC 2022. Blitz Women | Queen's Gambit Declined: Three Knights, Vienna Variation | |
| — | Khotenashvili | 0–1 | Kosteniuk | WRBC 2022. Blitz Women | Zukertort Opening: Dutch Variation | |
| — | Shuvalova | 0–1 | Kosteniuk | WRBC 2022. Blitz Women | Dutch Defense: Queen's Knight Variation | |
| — | Dzagnidze | ½–½ | Kosteniuk | WRBC 2022. Blitz Women | Dutch Defense: Semi-Leningrad Variation | |
| — | Arabidze | 1–0 | Kosteniuk | WRBC 2022. Blitz Women | Dutch Defense: Staunton Gambit | |
| Jun 27, 2026 | Kosteniuk | 1–0 | Vega Gutierrez | Demi-Finales: Kosteniuk, Alexandra - Vega Gutierrez, Sabrina | Sicilian Defense: Delayed Alapin Variation, with e6 | |
| Jun 25, 2026 | Osmak | 0–1 | Kosteniuk | Finales: Osmak, Yuliia - Kosteniuk, Alexandra | King's Indian Attack | |
| Jun 21, 2026 | Omonova | 1–0 | Kosteniuk | Quarter Finals | Game 1: Omonova, Umida - Kosteniuk, Alexandra | Caro-Kann Defense: Breyer Variation | |
| Jun 20, 2026 | Kosteniuk | ½–½ | Rodriguez Redondo | Round 10: Kosteniuk, Alexandra - Rodriguez Redondo, Adhara | Italian Game: Giuoco Pianissimo, Normal | |
| Jun 20, 2026 | Song | 1–0 | Kosteniuk | Round 9: Song, Yuxin - Kosteniuk, Alexandra | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Jun 20, 2026 | Kosteniuk | 1–0 | Leung | Round 4: Kosteniuk, Alexandra - Leung, Kwan Yat Calix | Sicilian Defense: Smith-Morra Gambit | |
| Jun 20, 2026 | Koneru | 0–1 | Kosteniuk | Round 3: Koneru, Humpy - Kosteniuk, Alexandra | Zukertort Opening | |
| Jun 20, 2026 | Kosteniuk | 0–1 | Injac | Round 2: Kosteniuk, Alexandra - Injac, Teodora | Italian Game: Giuoco Pianissimo, Normal | |
| Jun 20, 2026 | Kosteniuk | ½–½ | Yu | 2026 Fide World Blitz Team Chess Championship Pool A | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Jun 19, 2026 | Kosteniuk | ½–½ | Liu | Round 12: Kosteniuk, Alexandra - Liu, Bei | Sicilian Defense: Closed | |
| Jun 19, 2026 | Ulziikhishig Khishigbat | 0–1 | Kosteniuk | Round 11: Ulziikhishig Khishigbat - Kosteniuk, Alexandra | Nimzo-Indian Defense: Sämisch Variation | |
| Jun 18, 2026 | Kosteniuk | 0–1 | Nurman | Round 8: Kosteniuk, Alexandra - Nurman, Alua | Sicilian Defense: Alapin Variation, Barmen Defense | |
| Jun 18, 2026 | Tokhirjonova | ½–½ | Kosteniuk | Round 7: Tokhirjonova, Gulrukhbegim - Kosteniuk, Alexandra | Caro-Kann Defense: Exchange Variation | |
| Jun 17, 2026 | Song | 1–0 | Kosteniuk | Round 4: Song, Yuxin - Kosteniuk, Alexandra | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Jun 17, 2026 | Kosteniuk | 1–0 | Jimenez Fernandez | Round 3: Kosteniuk, Alexandra - Jimenez Fernandez, Rebeca | Caro-Kann Defense: Two Knights Attack | |
| Jun 13, 2026 | Kosteniuk | 1–0 | Badarudin | 2026 Asean E Sports Chess Cup Groupd | Caro-Kann Defense: Apocalypse Attack | |
| Jun 13, 2026 | Kosteniuk | ½–½ | Megaranto | 2026 Asean E Sports Chess Cup Groupd | Modern Defense: Standard Line | |
| Jun 12, 2026 | Kosteniuk | 1–0 | Laohawirapap | 2026 Asean E Sports Chess Cup Groupd | Sicilian Defense: Smith-Morra Gambit | |
| Jun 12, 2026 | Esipenko | 1–0 | Kosteniuk | 2026 Asean E Sports Chess Cup Groupd | English Opening: King's English Variation | |
| Jun 7, 2026 | Kosteniuk | 0–1 | Sukandar | WR Women's Chess Tour - Tokyo Blitz | Sicilian Defense: Alapin Variation, Anti-Alapin Gambit | |
| Jun 7, 2026 | Sukandar | 0–1 | Kosteniuk | WR Women's Chess Tour - Tokyo Blitz | Queen's Pawn Game: London System | |
| Jun 7, 2026 | Kosteniuk | ½–½ | Sukandar | WR Women's Chess Tour - Tokyo Blitz | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Jun 7, 2026 | Nurman | 0–1 | Kosteniuk | WR Women's Chess Tour - Tokyo Blitz | Four Knights Game: Scotch Variation, Belgrade Gambit | |
| Jun 7, 2026 | Kosteniuk | 1–0 | Nurman | WR Women's Chess Tour - Tokyo Blitz | Sicilian Defense: Closed, Traditional | |
| Jun 4, 2026 | Sakai | 0–1 | Kosteniuk | WR Women's Chess Tour - Tokyo Rapid | Bogo-Indian Defense: Nimzowitsch Variation | |
| Jun 4, 2026 | Nurman | 0–1 | Kosteniuk | WR Women's Chess Tour - Tokyo Blitz | Petrov's Defense: Modern Attack, Center Variation | |
| Jun 4, 2026 | Lagno | 1–0 | Kosteniuk | WR Women's Chess Tour - Tokyo Blitz | Four Knights Game: Spanish Variation | |
| Jun 4, 2026 | Kosteniuk | ½–½ | Lagno | WR Women's Chess Tour - Tokyo Blitz | Italian Game: Giuoco Pianissimo | |
| Jun 4, 2026 | Lagno | 1–0 | Kosteniuk | WR Women's Chess Tour - Tokyo Blitz | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Jun 4, 2026 | Kosteniuk | 1–0 | Lagno | WR Women's Chess Tour - Tokyo Blitz | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Jun 4, 2026 | Lagno | ½–½ | Kosteniuk | WR Women's Chess Tour - Tokyo Blitz | Caro-Kann Defense: Tartakower Variation | |
| Jun 4, 2026 | Sukandar | 0–1 | Kosteniuk | WR Women's Chess Tour - Tokyo Blitz | Queen's Pawn Game: London System | |
| Jun 4, 2026 | Vaishali | 1–0 | Kosteniuk | WR Women's Chess Tour - Tokyo Rapid | French Defense: Exchange Variation | |
| Jun 4, 2026 | Kosteniuk | ½–½ | Vaishali | WR Women's Chess Tour - Tokyo Rapid | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Jun 4, 2026 | Kosteniuk | 1–0 | Sakai | WR Women's Chess Tour - Tokyo Rapid | King's Indian Attack | |
| May 31, 2026 | Kosteniuk | 1–0 | Haag | Schweizer Mannschaftsmeisterschaft 2026, Nationalliga A | Sicilian Defense: Sozin Attack, Main Line | |
| May 13, 2026 | Batsiashvili | 0–1 | Kosteniuk | Round 1: Batsiashvili, Nino - Kosteniuk, Alexandra | Slav Defense: Exchange Variation | |
| May 9, 2026 | Bacrot | 1–0 | Kosteniuk | Luc Winants Memorial Rapid Chess Tournament 2026 | Nimzo-Larsen Attack: Classical Variation | |
| May 9, 2026 | Kosteniuk | 0–1 | Anton Guijarro | Luc Winants Memorial Rapid Chess Tournament 2026 | Caro-Kann Defense: Apocalypse Attack | |
| May 3, 2026 | Kosteniuk | 1–0 | Bulmaga | Round 5: Kosteniuk, Alexandra - Bulmaga, Irina | Yusupov-Rubinstein System | |
| May 3, 2026 | Ushenina | 1–0 | Kosteniuk | Round 4: Ushenina, Anna - Kosteniuk, Alexandra | Queen's Gambit Declined | |
| May 3, 2026 | Zatonskih | 0–1 | Kosteniuk | Round 3: Zatonskih, Anna - Kosteniuk, Alexandra | Queen's Gambit Declined: Ragozin Defense | |
| Apr 19, 2026 | Kosteniuk | 1–0 | Mihaljevic | 1BLwomen | Sicilian Defense: Alapin Variation | |
| Apr 18, 2026 | Janzelj | * | Kosteniuk | 1BLwomen | Queen's Pawn Game: Colle System, Grünfeld Formation | |
| Apr 17, 2026 | Kosteniuk | 1–0 | Butenandt | 1BLwomen | English Opening: Neo-Catalan | |
| Apr 6, 2026 | Kosteniuk | ½–½ | Dauner | Round 9: Kosteniuk, Alexandra - Dauner, Benedikt | ? | |
| Apr 6, 2026 | Saric | 1–0 | Kosteniuk | Round 8: Saric, Ivan - Kosteniuk, Alexandra | ? | |
| Apr 5, 2026 | Faerber | 0–1 | Kosteniuk | Round 7: Faerber, David - Kosteniuk, Alexandra | ? | |
| Apr 5, 2026 | Kosteniuk | 1–0 | Loeffler | Round 6: Kosteniuk, Alexandra - Loeffler, Stefan | ? | |
| Apr 4, 2026 | Dominguez Perez | 1–0 | Kosteniuk | Round 5: Dominguez Perez, Leinier - Kosteniuk, Alexandra | ? | |
| Apr 4, 2026 | Kamsky | ½–½ | Kosteniuk | Round 4: Kamsky, Gata - Kosteniuk, Alexandra | ? | |
| Apr 3, 2026 | Kosteniuk | 1–0 | Quirke | Round 3: Kosteniuk, Alexandra - Quirke, Jeffrey | ? | |
| Apr 3, 2026 | Kosteniuk | 1–0 | Kuehn | Round 1: Kosteniuk, Alexandra - Kuehn, Martin | ? | |
| Apr 3, 2026 | Ciolek | ½–½ | Kosteniuk | Round 2: Ciolek, Andreas - Kosteniuk, Alexandra | ? | |
| Mar 25, 2026 | Kosteniuk | 0–1 | Muzychuk | 2026 Chesscom Open Play In 4 | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Mar 25, 2026 | Mekhitarian | ½–½ | Kosteniuk | 2026 Chesscom Open Play In 4 | Réti Opening: Advance Variation, Michel Gambit | |
| Mar 25, 2026 | Kosteniuk | ½–½ | Samadov | 2026 Chesscom Open Play In 4 | Sicilian Defense: Smith-Morra Gambit | |
| Mar 25, 2026 | Gorovets | ½–½ | Kosteniuk | 2026 Chesscom Open Play In 4 | English Opening: King's English Variation | |
| Mar 25, 2026 | Kosteniuk | 1–0 | Daneshvar | 2026 Chesscom Open Play In 4 | King's Pawn Game | |
| Mar 25, 2026 | Galaviz Medina | 0–1 | Kosteniuk | 2026 Chesscom Open Play In 4 | Nimzo-Indian Defense: St. Petersburg Variation, American Variation | |
| Mar 25, 2026 | Kosteniuk | 0–1 | Terry | 2026 Chesscom Open Play In 4 | Caro-Kann Defense: Apocalypse Attack | |
| Mar 25, 2026 | Le | 1–0 | Kosteniuk | 2026 Chesscom Open Play In 4 | Zukertort Opening | |
| Mar 25, 2026 | Pichot | 1–0 | Kosteniuk | 2026 Chesscom Open Play In 4 | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Mar 18, 2026 | Dominguez Perez | 0–1 | Kosteniuk | 2026 Chesscom Open Play In 2 | ? | |
| Mar 18, 2026 | Kosteniuk | ½–½ | Deac | 2026 Chesscom Open Play In 2 | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Mar 18, 2026 | Karthikeyan | 0–1 | Kosteniuk | 2026 Chesscom Open Play In 2 | Zukertort Opening | |
| Mar 18, 2026 | Kosteniuk | ½–½ | Vogel | 2026 Chesscom Open Play In 2 | Sicilian Defense: Smith-Morra Gambit | |
| Mar 18, 2026 | Vokhidov | ½–½ | Kosteniuk | 2026 Chesscom Open Play In 2 | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Mar 18, 2026 | Kosteniuk | 0–1 | Terry | 2026 Chesscom Open Play In 2 | French Defense: Exchange Variation | |
| Mar 18, 2026 | Pranav | 0–1 | Kosteniuk | 2026 Chesscom Open Play In 2 | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Mar 18, 2026 | Kosteniuk | ½–½ | Henriquez Villagra | 2026 Chesscom Open Play In 2 | Sicilian Defense: Smith-Morra Gambit | |
| Mar 18, 2026 | Maghsoodloo | 1–0 | Kosteniuk | 2026 Chesscom Open Play In 2 | English Opening: King's English Variation, Kramnik-Shirov Counterattack | |
| Feb 13, 2026 | Assaubayeva | 1–0 | Kosteniuk | Freestyle Chess Women's Match | ? | |
| Feb 11, 2026 | Kosteniuk | 1–0 | Assaubayeva | Freestyle Chess Women's Match | ? | |
| Feb 11, 2026 | Kosteniuk | 0–1 | Assaubayeva | Freestyle Chess Women's Match | ? | |
| Feb 11, 2026 | Assaubayeva | ½–½ | Kosteniuk | Freestyle Chess Women's Match | ? | |
| Feb 7, 2026 | Manko | ½–½ | Kosteniuk | Frauen Bundesliga | Catalan Opening | |
| Feb 6, 2026 | Kosteniuk | 1–0 | Roebers | Frauen Bundesliga | French Defense: Exchange Variation | |
| Jan 10, 2026 | Matnadze Bujiashvili | 0–1 | Kosteniuk | Round 5: Matnadze Bujiashvili, Ann - Kosteniuk, Alexandra | Bogo-Indian Defense: Nimzowitsch Variation | |
| Jan 9, 2026 | Kosteniuk | ½–½ | Stefanova | Round 13: Kosteniuk, Alexandra - Stefanova, Antoaneta | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Jan 9, 2026 | Kiolbasa | 1–0 | Kosteniuk | Round 12: Kiolbasa, Oliwia - Kosteniuk, Alexandra | Caro-Kann Defense: Maróczy Variation | |