| Game | Result | Opening | Date |
|---|---|---|---|
| Wajer, Szymon (1742) – Kostowski, Ireneus, Dr. (1875) | 1/2-1/2 | Sicilian Defense: Alapin Variation, Barmen Defense | 2026-08-18 |
| Kostowski, Ireneus, Dr. (1875) – Brudzynski, Wojciech (1934) | 0-1 | Indian Defense: London System | 2026-08-17 |
| Borowik, Grzegorz (1511) – Kostowski, Ireneus, Dr. (1875) | 0-1 | Benoni Defense: Modern Variation | 2026-08-16 |
| Kostowski, Ireneus, Dr. (1875) – Stawecki, Bartlomiej (1653) | 1-0 | Queen's Pawn Game: Accelerated London System | 2026-08-15 |
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