| Jan 4, 2026 | Kostecka | 0–1 | Mittelberger | Round 8: Kostecka, Marika - Mittelberger, Peter | Modern Defense: Standard Defense | |
| Jan 3, 2026 | Kostecka | 1–0 | Guba | Round 7: Kostecka, Marika - Guba, Viktor | Ruy Lopez: Morphy Defense, Modern Steinitz Defense | |
| Jan 2, 2026 | Struck | ½–½ | Kostecka | Round 6: Struck, Lasse - Kostecka, Marika | English Opening: Symmetrical Variation, Rubinstein Variation | |
| Dec 31, 2025 | Kostecka | 1–0 | Stanojevic | Round 2: Kostecka, Marika - Stanojevic, Ilija | Sicilian Defense: Accelerated Dragon, Maróczy Bind, Gurgenidze Variation | |
| Dec 31, 2025 | Saine | 1–0 | Kostecka | Round 4: Saine, Zachary - Kostecka, Marika | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Dec 31, 2025 | Gallasch | 0–1 | Kostecka | Round 3: Gallasch, Robin - Kostecka, Marika | Sicilian Defense | |
| Dec 31, 2025 | Kostecka | ½–½ | Bartelt | Round 5: Kostecka, Marika - Bartelt, Max Peter | French Defense: Schlechter Variation | |
| Jul 20, 2025 | Garifulin | 1–0 | Kostecka | SERBIA OPEN 2025 - CHALLENGER - СРБИЈА ОПЕН 2025 - ИЗАЗИВАЧИ | Sicilian Defense: Dragon Variation, Yugoslav Attack, Belezky Line | |
| Jul 18, 2025 | Boci | ½–½ | Kostecka | SERBIA OPEN 2025 - CHALLENGER - СРБИЈА ОПЕН 2025 - ИЗАЗИВАЧИ | Sicilian Defense: Chekhover Variation | |
| Jul 18, 2025 | Kostecka | ½–½ | Yildirim | SERBIA OPEN 2025 - CHALLENGER - СРБИЈА ОПЕН 2025 - ИЗАЗИВАЧИ | Ruy Lopez: Morphy Defense, Arkhangelsk Variation | |
| Jul 17, 2025 | Pikula | ½–½ | Kostecka | SERBIA OPEN 2025 - CHALLENGER - СРБИЈА ОПЕН 2025 - ИЗАЗИВАЧИ | Sicilian Defense: Najdorf Variation, Adams Attack | |
| Jul 16, 2025 | Kostecka | ½–½ | Azaric | SERBIA OPEN 2025 - CHALLENGER - СРБИЈА ОПЕН 2025 - ИЗАЗИВАЧИ | Ruy Lopez: Morphy Defense, Neo-Arkhangelsk Variation | |
| Jul 25, 2022 | Kostecka | ½–½ | Bogusz | Warsaw Open | A | Sicilian Defense: Najdorf Variation, English Attack | |
| Jul 24, 2022 | Fishchuk | 1–0 | Kostecka | Warsaw Open | A | Bogo-Indian Defense: Grünfeld Variation | |
| Jul 23, 2022 | Kostecka | 1–0 | Zalega | Warsaw Open | A | Sicilian Defense: Classical Variation | |
| Jul 23, 2022 | Atkinson | 1–0 | Kostecka | Warsaw Open | A | English Opening: Anglo-Indian Defense, King's Knight Variation | |
| Jul 22, 2022 | Kostecka | ½–½ | Pettersson | Warsaw Open | A | Caro-Kann Defense: Karpov Variation, Modern Main Line | |
| Jul 21, 2022 | Malek | 1–0 | Kostecka | Warsaw Open | A | Nimzo-Indian Defense: Sämisch Variation, O'Kelly Variation | |
| Jul 19, 2022 | Kostecka | 0–1 | Kulesza | Warsaw Open | A | Sicilian Defense: Najdorf Variation, English Attack | |
| Jul 18, 2022 | Ciechanski | 1–0 | Kostecka | Warsaw Open | A | Sicilian Defense: Closed, Traditional | |
| Sep 12, 2021 | Kostecka | 1–0 | Statucki | Polish League Division 1 | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Sep 11, 2021 | Warchol | 1–0 | Kostecka | Polish League Division 1 | King's Indian Defense: Fianchetto Variation, Uhlmann-Szabo System | |
| Sep 8, 2021 | Kostecka | 0–1 | Czerwinska | Polish League Division 1 | Philidor Defense: Lion Variation | |
| Sep 7, 2021 | Kostecka | 0–1 | Murawko | Polish League Division 1 | Modern Defense: Standard Defense | |
| Sep 6, 2021 | Rudnicka | ½–½ | Kostecka | Polish League Division 1 | Indian Defense: Przepiorka Variation | |
| Sep 5, 2021 | Kostecka | 1–0 | Budkiewicz | Polish League Division 1 | Sicilian Defense: Scheveningen Variation, English Attack, with f3 | |
| Sep 4, 2021 | Adamczyk | 1–0 | Kostecka | Polish League Division 1 | King's Indian Defense: Fianchetto Variation, Yugoslav Variation, Rare Line | |
