| Jan 11, 2024 | Stamatis Kourkoulos-Arditis | 1–0 | Jakub Kosakowski | Round 9: Stamatis Kourkoulos-Arditis - Jakub Kosakowski | Sicilian Defense: Four Knights Variation, Exchange Variation | |
| Jan 10, 2024 | Jakub Kosakowski | ½–½ | Dimitris Alexakis | Round 8: Jakub Kosakowski - Dimitris Alexakis | Zukertort Opening: Sicilian Invitation | |
| Jan 9, 2024 | Mahendru Jaiveer | 1–0 | Jakub Kosakowski | Round 7: Mahendru Jaiveer - Jakub Kosakowski | Sicilian Defense: Taimanov Variation | |
| Jan 8, 2024 | Jakub Kosakowski | 1–0 | Tao Pang | Round 6: Jakub Kosakowski - Tao Pang | Zukertort Opening | |
| Jan 7, 2024 | Jakub Kosakowski | ½–½ | Vedant Nagarkatte | Round 5: Jakub Kosakowski - Vedant Nagarkatte | Queen's Pawn Game: Colle System | |
| Jan 6, 2024 | Nikolaos Spyropoulos | ½–½ | Jakub Kosakowski | Round 4: Nikolaos Spyropoulos - Jakub Kosakowski | Sicilian Defense: Four Knights Variation, Exchange Variation | |
| Jan 5, 2024 | Jakub Kosakowski | ½–½ | Ioannis Nikolaidis | Round 3: Jakub Kosakowski - Ioannis Nikolaidis | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jan 4, 2024 | Nikolaos Poupalos | 0–1 | Jakub Kosakowski | Round 2: Nikolaos Poupalos - Jakub Kosakowski | Sicilian Defense: Taimanov Variation | |
| Jan 3, 2024 | Jakub Kosakowski | 1–0 | Spyridon Kapnisis | Round 1: Jakub Kosakowski - Spyridon Kapnisis | Pirc Defense: Byrne Variation | |
| May 28, 2023 | Jakub Kosakowski | * | Liordis Vera | 32nd Annual Chicago Open | ? | |
| May 27, 2023 | Jakub Kosakowski | ½–½ | Gunnar Andersen | 32nd Annual Chicago Open | East Indian Defense | |
| May 27, 2023 | Michalina Rudzinska | * | Jakub Kosakowski | 32nd Annual Chicago Open | ? | |
| Apr 10, 2023 | Jakub Kosakowski | ½–½ | Angel Espinosa Aranda | Ronda 9: Jakub Kosakowski - Angel Espinosa Aranda | Queen's Pawn Game: London System | |
| Apr 9, 2023 | Mher Hovhannisyan | 0–1 | Jakub Kosakowski | Ronda 8: Mher Hovhannisyan - Jakub Kosakowski | Caro-Kann Defense: Panov Attack, Modern Defense | |
| Apr 9, 2023 | Jakub Kosakowski | 1–0 | Alejandro Domingo Nunez | Ronda 7: Jakub Kosakowski - Alejandro Domingo Nunez | Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack | |
| Apr 8, 2023 | Meruert Kamalidenova | ½–½ | Jakub Kosakowski | Ronda 6: Meruert Kamalidenova - Jakub Kosakowski | Caro-Kann Defense: Tartakower Variation | |
| Apr 7, 2023 | Jakub Kosakowski | ½–½ | Alex Garrido Outon | Ronda 5: Jakub Kosakowski - Alex Garrido Outon | Sicilian Defense: Najdorf Variation, Opocensky Variation | |
| Apr 7, 2023 | Marta Garcia Martin | 0–1 | Jakub Kosakowski | Ronda 4: Marta Garcia Martin - Jakub Kosakowski | Caro-Kann Defense: Advance Variation, Short Variation | |
| Apr 6, 2023 | Jakub Kosakowski | ½–½ | Zhaoqi Liu | Ronda 3: Jakub Kosakowski - Zhaoqi Liu | French Defense: Advance Variation, Euwe Variation | |
| Apr 6, 2023 | Oisin O`cuilleanain | 0–1 | Jakub Kosakowski | Ronda 2: Oisin O`cuilleanain - Jakub Kosakowski | Caro-Kann Defense: Two Knights Attack, Mindeno Variation, Exchange Line | |
| Apr 5, 2023 | Jakub Kosakowski | 1–0 | Maria Antonia Vicens Company | Ronda 1: Jakub Kosakowski - Maria Antonia Vicens Company | Zukertort Opening | |
| Feb 24, 2023 | Jakub Kosakowski | 0–1 | Tom Meurs | Round 9: Jakub Kosakowski - Tom Meurs | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Feb 23, 2023 | Sergey A. Fedorchuk | * | Jakub Kosakowski | Round 8: Sergey A. Fedorchuk - Jakub Kosakowski | Caro-Kann Defense: Maróczy Variation | |
| Feb 22, 2023 | Jakub Kosakowski | ½–½ | Krishnan Sasikiran | Round 7: Jakub Kosakowski - Krishnan Sasikiran | Ruy Lopez: Closed, Breyer Defense, Zaitsev Hybrid | |
| Feb 22, 2023 | Rao Sharan | * | Jakub Kosakowski | Round 6: Rao Sharan - Jakub Kosakowski | Rapport-Jobava System | |
| Feb 21, 2023 | Jakub Kosakowski | * | Alexander Kovchan | Round 5: Jakub Kosakowski - Alexander Kovchan | ? | |
| Feb 20, 2023 | Marcin Sieciechowicz | * | Jakub Kosakowski | Round 4: Marcin Sieciechowicz - Jakub Kosakowski | King's Indian Defense: Sämisch Variation, Sämisch Gambit | |
| Feb 20, 2023 | Jakub Kosakowski | 1–0 | S. Nitin | Round 3: Jakub Kosakowski - S. Nitin | East Indian Defense | |
| Feb 19, 2023 | Andrew J Muir | 0–1 | Jakub Kosakowski | Round 2: Andrew J Muir - Jakub Kosakowski | King's Indian Defense: Steiner Attack | |
| Feb 19, 2023 | Jakub Kosakowski | 1–0 | Etienne Orieux | Round 1: Jakub Kosakowski - Etienne Orieux | French Defense: Schlechter Variation | |
| Feb 16, 2022 | Jesper Sondergaard Thybo | 1–0 | Jakub Kosakowski | Round 7: Jesper Sondergaard Thybo - Jakub Kosakowski | Zukertort Opening: Nimzo-Larsen Variation | |
| Feb 16, 2022 | Jakub Kosakowski | 0–1 | Vladislav Bakhmatsky | Round 6: Jakub Kosakowski - Vladislav Bakhmatsky | French Defense: Rubinstein Variation, Blackburne Defense | |
| Feb 15, 2022 | Robin Bentel | 0–1 | Jakub Kosakowski | Round 5: Robin Bentel - Jakub Kosakowski | Queen's Gambit Declined: Three Knights Variation | |
| Feb 14, 2022 | Jakub Kosakowski | ½–½ | Sergey A. Fedorchuk | Round 4: Jakub Kosakowski - Sergey A. Fedorchuk | Sicilian Defense: Kupreichik Variation | |
| Feb 14, 2022 | Annmarie Muetsch | 0–1 | Jakub Kosakowski | Round 3: Annmarie Muetsch - Jakub Kosakowski | Caro-Kann Defense: Classical Variation, Flohr Variation | |
