| Mar 15, 2026 | Kozak | 0–1 | Gorecki | Indywidualne Mistrzostwa Polski Juniorow 2026 - C16 | French Defense: Classical Variation, Shirov-Anand Variation | |
| Mar 14, 2026 | Jodlowski | ½–½ | Kozak | Indywidualne Mistrzostwa Polski Juniorow 2026 - C16 | Hungarian Opening: Symmetrical Variation | |
| Mar 13, 2026 | Rabenda | ½–½ | Kozak | Indywidualne Mistrzostwa Polski Juniorow 2026 - C16 | Benoni Defense: Knight's Tour Variation | |
| Mar 12, 2026 | Kozak | 0–1 | Szudrowicz | Indywidualne Mistrzostwa Polski Juniorow 2026 - C16 | Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation | |
| Mar 11, 2026 | Khimichenko | 1–0 | Kozak | Indywidualne Mistrzostwa Polski Juniorow 2026 - C16 | English Opening: Symmetrical Variation, Mecking Variation | |
| Mar 10, 2026 | Kozak | ½–½ | Pawleta | Indywidualne Mistrzostwa Polski Juniorow 2026 - C16 | Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack | |
| Mar 10, 2026 | Smolinski | 1–0 | Kozak | Indywidualne Mistrzostwa Polski Juniorow 2026 - C16 | Sicilian Defense: Najdorf Variation, Opocensky Variation, Modern Line | |
| Mar 9, 2026 | Kozak | 1–0 | Uhryn | Indywidualne Mistrzostwa Polski Juniorow 2026 - C16 | French Defense: Classical Variation, Shirov-Anand Variation | |
| Mar 8, 2026 | Futyma | 1–0 | Kozak | Indywidualne Mistrzostwa Polski Juniorow 2026 - C16 | Benoni Defense: Benoni-Indian Defense, Kingside Move Order | |
| Jun 19, 2025 | Niesporek | 1–0 | Kozak | DMPJ 1 liga 2025 | Sicilian Defense: Najdorf Variation, Adams Attack | |
| Jun 18, 2025 | Kozak | 1–0 | Oles | DMPJ 1 liga 2025 | King's Pawn Game | |
| Jun 15, 2025 | Gora | ½–½ | Kozak | DMPJ 1 liga 2025 | Sicilian Defense: Najdorf Variation, Lipnitsky Attack | |
| Jun 14, 2025 | Kozak | ½–½ | Fojcik | DMPJ 1 liga 2025 | French Defense: Rubinstein Variation, Blackburne Defense | |
| Aug 17, 2024 | Fojcik | ½–½ | Kozak | Open A | Benoni Defense: Classical Variation, Traditional Variation | |
| Aug 17, 2024 | Moczulski | ½–½ | Kozak | Open A | Sicilian Defense: Alapin Variation | |
| Aug 16, 2024 | Kozak | 1–0 | Kisiel | Open A | French Defense: Classical Variation, Steinitz Variation | |
| Aug 14, 2024 | Kozak | ½–½ | Kawecki | Open A | English Opening: Symmetrical Variation | |
| Aug 14, 2024 | Owczarek | 0–1 | Kozak | Open A | English Opening: Four Knights System, Nimzowitsch Variation | |
| Aug 12, 2024 | Baran | ½–½ | Kozak | Open A | Sicilian Defense: Najdorf Variation, Opocensky Variation | |
| Aug 11, 2024 | Kozak | ½–½ | Osinski | Open A | Sicilian Defense: Najdorf Variation, English Attack | |
| Aug 10, 2024 | Kozak | 0–1 | Dabek | Open A | Sicilian Defense: Najdorf Variation, English Attack | |
| Aug 10, 2024 | Nowicki | 1–0 | Kozak | Open A | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Jun 20, 2023 | Kozak | ½–½ | Przybylski | DMPJ - I Liga 2023 | Italian Game: Scotch Gambit, Max Lange Attack | |
| Jun 19, 2023 | Rutkowski | ½–½ | Kozak | DMPJ - I Liga 2023 | Sicilian Defense: Prins Variation | |
| Jun 18, 2023 | Kozak | 1–0 | Wons | DMPJ - I Liga 2023 | Sicilian Defense: Lasker-Pelikan Variation | |
| Jun 17, 2023 | Dobrowolski | ½–½ | Kozak | DMPJ - I Liga 2023 | Sicilian Defense: Najdorf Variation, English Attack | |
| Jun 16, 2023 | Dobrowolski | ½–½ | Kozak | DMPJ - I Liga 2023 | Sicilian Defense: Najdorf Variation, English Attack | |
| Jun 15, 2023 | Kozak | 1–0 | Gruca | DMPJ - I Liga 2023 | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Jun 14, 2023 | Czeremcha | ½–½ | Kozak | DMPJ - I Liga 2023 | Italian Game: Hungarian Defense | |
| Jun 13, 2023 | Rajbharath | ½–½ | Kozak | DMPJ - I Liga 2023 | Benoni Defense: Classical Variation | |
| Jan 20, 2022 | Kozak | 0–1 | Mazonik | Malopolskie Chess Tour - Grupa Amatorska | Alekhine Defense: Exchange Variation | |
| Jan 19, 2022 | Kopaczewski | ½–½ | Kozak | Malopolskie Chess Tour - Grupa Amatorska | English Opening: King's English Variation, Two Knights Variation, Reversed Dragon | |
| Jan 18, 2022 | Kozak | 1–0 | Wykurz | Malopolskie Chess Tour - Grupa Amatorska | Scotch Game: Mieses Variation | |
| Jan 18, 2022 | Grochola | 0–1 | Kozak | Malopolskie Chess Tour - Grupa Amatorska | Sicilian Defense | |
| Jan 17, 2022 | Ryszka | ½–½ | Kozak | Malopolskie Chess Tour - Grupa Amatorska | Nimzo-Larsen Attack: Modern Variation | |
| Jan 16, 2022 | Kozak | 0–1 | Kowalczyk | Malopolskie Chess Tour - Grupa Amatorska | Modern Defense: Pseudo-Austrian Attack | |
| Jan 16, 2022 | Socha | 0–1 | Kozak | Malopolskie Chess Tour - Grupa Amatorska | Sicilian Defense: Najdorf Variation | |
| Jan 15, 2022 | Kozak | 1–0 | Ryszka | Malopolskie Chess Tour - Grupa Amatorska | Sicilian Defense: Hyperaccelerated Fianchetto | |
| — | Kozak | ½–½ | Kraczek | C16b | Alekhine Defense: Exchange Variation | |
| — | Kozak | 1–0 | Jablonski | C16b | Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack | |
| — | Kozak | 0–1 | Dobosiewicz | C16b | Italian Game: Scotch Gambit, Max Lange Attack | |
| — | Cieslak | 1–0 | Kozak | C16b | English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, with Nb6 | |
| — | Trzeciak | ½–½ | Kozak | C16b | Polish Opening: Schiffler-Sokolsky Variation | |
