| Jul 13, 2026 | Sniadecki | 1–0 | Lachacz | Blitz C18 | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Jul 13, 2026 | Lachacz | 0–1 | Zareba | Blitz C18 | Sicilian Defense: Dragon Variation, Classical Variation | |
| Jul 13, 2026 | Krawczyk | 0–1 | Lachacz | Blitz C18 | King's Indian Attack: Wahls Defense | |
| Jul 13, 2026 | Lachacz | 0–1 | Borischik | Blitz C18 | Pirc Defense: Austrian Attack | |
| Jul 11, 2026 | Borischik | 1–0 | Lachacz | Rapid C18 | English Opening: Symmetrical Variation, Fianchetto Variation | |
| Jun 7, 2026 | Lachacz | 1–0 | Korzeniewski | mwj sypniewo c18 | Petrov's Defense: Classical Attack, Staunton Variation | |
| Jun 7, 2026 | Wisniarek | ½–½ | Lachacz | mwj sypniewo c18 | Queen's Gambit Declined: Modern Variation, Normal Line | |
| Jun 5, 2026 | Lachacz | ½–½ | Wolnicki | mwj sypniewo c18 | Caro-Kann Defense: Tartakower Variation | |
| Jun 5, 2026 | Matuszewski | 0–1 | Lachacz | mwj sypniewo c18 | Sicilian Defense: Najdorf Variation, Freak Attack | |
| Jun 4, 2026 | Lachacz | 1–0 | Pachura | mwj sypniewo c18 | French Defense: Winawer Variation, Portisch-Hook Variation | |
| Jun 3, 2026 | Lachacz | ½–½ | Korzystka | mwj sypniewo c18 | Queen's Pawn Game: Zukertort Variation | |
| Jun 3, 2026 | Lachacz | 1–0 | Marcinkowski | mwj sypniewo c18 | Caro-Kann Defense: Tartakower Variation | |
| Jun 3, 2026 | Kolinski | ½–½ | Lachacz | mwj sypniewo c18 | Sicilian Defense: Chekhover Variation | |
| May 29, 2026 | Kisiel | 1–0 | Lachacz | II DMP Juniorow 2026 | Indian Defense: Anti-Nimzo-Indian | |
| May 28, 2026 | Lachacz | 1–0 | Wcislo | II DMP Juniorow 2026 | Queen's Gambit Accepted: Classical Defense, Main Line | |
| May 27, 2026 | Sonibare | 0–1 | Lachacz | II DMP Juniorow 2026 | Sicilian Defense: Najdorf Variation, Zagreb Variation | |
| May 25, 2026 | Borowik | 1–0 | Lachacz | II DMP Juniorow 2026 | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| May 24, 2026 | Stanik | 0–1 | Lachacz | II DMP Juniorow 2026 | Sicilian Defense: Moscow Variation | |
| May 23, 2026 | Lachacz | 0–1 | Komarow-Dereniowski | II DMP Juniorow 2026 | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| May 22, 2026 | Spytek | ½–½ | Lachacz | II DMP Juniorow 2026 | Catalan Opening: Open Defense, Classical Line | |
| May 21, 2026 | Lachacz | ½–½ | Szalanski | II DMP Juniorow 2026 | Nimzo-Indian Defense: Classical Variation, Berlin Variation | |
| May 21, 2026 | Lachacz | 0–1 | Niesporek | II DMP Juniorow 2026 | English Opening: Symmetrical Variation, Anti-Benoni Variation, Spielmann Defense | |
| Jun 15, 2025 | Lachacz | 0–1 | Kolinski | MWJ | Queen's Gambit Declined: Harrwitz Attack, Fianchetto Defense | |
| Jun 14, 2025 | Wisniarek | ½–½ | Lachacz | MWJ | Queen's Gambit Declined: Modern Variation, Normal Line | |
| Jun 13, 2025 | Lachacz | 1–0 | Oszutowska | MWJ | Sicilian Defense: Taimanov Variation, Bastrikov Variation | |
| Jun 13, 2025 | Kordusiak | 0–1 | Lachacz | MWJ | Sicilian Defense: Alapin Variation | |
| Jun 12, 2025 | Lachacz | 1–0 | Anczarski | MWJ | Caro-Kann Defense: Goldman Variation | |
| Jun 12, 2025 | Kosecki | ½–½ | Lachacz | MWJ | Sicilian Defense: Modern Variations | |
| Jun 11, 2025 | Lachacz | 1–0 | Gustowski | MWJ | Ruy Lopez: Morphy Defense, Caro Variation | |
| Jun 11, 2025 | Pyrek | 1–0 | Lachacz | MWJ | Queen's Gambit Declined: Modern Variation, Normal Line | |
| Jun 10, 2025 | Rothe | 1–0 | Lachacz | MWJ | Sicilian Defense: Grand Prix Attack | |
| Aug 2, 2024 | Lachacz | 0–1 | Liskiewicz | Mistrzostwa Polski Juniorów - C16 RAPID | Pirc Defense: Classical Variation, Quiet System, Chigorin Line | |
| Jun 3, 2024 | Lachacz | 1–0 | Haluja | chlopcy do lat 17 | Caro-Kann Defense: Exchange Variation | |
| Jun 2, 2024 | Lachacz | 1–0 | Garwacki | chlopcy do lat 17 | Philidor Defense: Lion Variation | |
| Jun 2, 2024 | Nawrocki | 1–0 | Lachacz | chlopcy do lat 17 | Sicilian Defense: Najdorf Variation | |
| Jun 1, 2024 | Lachacz | 1–0 | Pachura | chlopcy do lat 17 | French Defense: Advance Variation, Euwe Variation | |
| Jun 1, 2024 | Nowicki | 0–1 | Lachacz | chlopcy do lat 17 | Sicilian Defense: Staunton-Cochrane Variation | |
| May 31, 2024 | Skrzypinski | 1–0 | Lachacz | chlopcy do lat 17 | Sicilian Defense: Chekhover Variation | |