27 games in the PremovedPrep archive. Games as White.
| White | Black | Result | ECO | Event | Date |
|---|---|---|---|---|---|
| Kostecka, Marika | Mittelberger, Peter | 0-1 | B06 | Round 8: Kostecka, Marika - Mittelberger, Peter | 2026-01-04 |
| Kostecka, Marika | Guba, Viktor | 1-0 | C72 | Round 7: Kostecka, Marika - Guba, Viktor | 2026-01-03 |
| Kostecka, Marika | Stanojevic, Ilija | 1-0 | B36 | Round 2: Kostecka, Marika - Stanojevic, Ilija | 2025-12-31 |
| Kostecka, Marika | Bartelt, Max Peter | 1/2-1/2 | C00 | Round 5: Kostecka, Marika - Bartelt, Max Peter | 2025-12-31 |
| Kostecka, Marika | Yildirim, Kemal | 1/2-1/2 | C78 | SERBIA OPEN 2025 - CHALLENGER - СРÐÐÐÐ ÐÐÐÐ 2025 - ÐÐÐÐÐÐÐЧР| 2025-07-18 |
| Kostecka, Marika | Azaric, Slavko | 1/2-1/2 | C78 | SERBIA OPEN 2025 - CHALLENGER - СРÐÐÐÐ ÐÐÐÐ 2025 - ÐÐÐÐÐÐÐЧР| 2025-07-16 |
| Kostecka, Marika | Bogusz, Alan | 1/2-1/2 | B90 | Warsaw Open | A | 2022-07-25 |
| Kostecka, Marika | Zalega, Maciej | 1-0 | B56 | Warsaw Open | A | 2022-07-23 |
| Kostecka, Marika | Pettersson, Alexander | 1/2-1/2 | B17 | Warsaw Open | A | 2022-07-22 |
| Kostecka, Marika | Kulesza, Andrzej | 0-1 | B90 | Warsaw Open | A | 2022-07-19 |
| Kostecka, Marika | Statucki, Maciej | 1-0 | B38 | Polish League Division 1 | 2021-09-12 |
| Kostecka, Marika | Czerwinska, Milena | 0-1 | C41 | Polish League Division 1 | 2021-09-08 |
| Kostecka, Marika | Murawko, Katarzyna | 0-1 | B06 | Polish League Division 1 | 2021-09-07 |
| Kostecka, Marika | Budkiewicz, Magdalena | 1-0 | B90 | Polish League Division 1 | 2021-09-05 |