| Mar 6, 2026 | Kossowski | 0–1 | Kaliszuk | AMP-TEAM | Ruy Lopez: Closed, Flohr System | |
| Sep 8, 2024 | Kossowski | ½–½ | Pelowski | 2liga-3 | Caro-Kann Defense: Gurgenidze System | |
| Sep 7, 2024 | Olszewski | ½–½ | Kossowski | 2liga-3 | Bishop's Opening: Vienna Hybrid, Hromádka Variation | |
| Sep 5, 2024 | Kossowski | 0–1 | Flis | 2liga-3 | Ruy Lopez: Closed, Chigorin Defense | |
| Sep 4, 2024 | Brzozowski | 1–0 | Kossowski | 2liga-3 | Nimzo-Larsen Attack: Classical Variation | |
| Sep 3, 2024 | Kossowski | 1–0 | Wozniak | 2liga-3 | Nimzowitsch Defense: Williams Variation | |
| Sep 2, 2024 | Draganik | 0–1 | Kossowski | 2liga-2 | Vienna Game: Vienna Gambit, Paulsen Attack | |
| Sep 1, 2024 | Kossowski | 1–0 | Meller | 2liga-3 | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Aug 31, 2024 | Wozny | 1–0 | Kossowski | 2liga-3 | Bogo-Indian Defense: Nimzowitsch Variation | |
| Aug 25, 2024 | Szczygiel | ½–½ | Kossowski | 60. Jubileuszowy Miedzynarodowy Festiwal Szachowy Akiby Rubinsteina - OPEN D | Nimzo-Indian Defense: Normal Variation, Classical Defense | |
| Aug 24, 2024 | Kossowski | 1–0 | Artsemenka | 60. Jubileuszowy Miedzynarodowy Festiwal Szachowy Akiby Rubinsteina - OPEN D | French Defense: Tarrasch Variation, Guimard Defense, Main Line | |
| Aug 23, 2024 | Rosc | 0–1 | Kossowski | 60. Jubileuszowy Miedzynarodowy Festiwal Szachowy Akiby Rubinsteina - OPEN D | Queen's Pawn Game: London System | |
| Aug 22, 2024 | Kossowski | 1–0 | Palejko | 60. Jubileuszowy Miedzynarodowy Festiwal Szachowy Akiby Rubinsteina - OPEN D | Petrov's Defense: Nimzowitsch Attack | |
| Aug 21, 2024 | Darowicki | 1–0 | Kossowski | 60. Jubileuszowy Miedzynarodowy Festiwal Szachowy Akiby Rubinsteina - OPEN D | King's Indian Attack | |
| Aug 20, 2024 | Kossowski | ½–½ | Gromczak | 60. Jubileuszowy Miedzynarodowy Festiwal Szachowy Akiby Rubinsteina - OPEN D | Pirc Defense: Austrian Attack, Kurajica Variation | |
| Aug 19, 2024 | Zgadzaj | 0–1 | Kossowski | 60. Jubileuszowy Miedzynarodowy Festiwal Szachowy Akiby Rubinsteina - OPEN D | Réti Opening: Advance Variation | |
| Aug 18, 2024 | Kossowski | 1–0 | Ogorzalek | 60. Jubileuszowy Miedzynarodowy Festiwal Szachowy Akiby Rubinsteina - OPEN D | Sicilian Defense: Accelerated Dragon, Maróczy Bind, Gurgenidze Variation | |
| Aug 17, 2024 | Kuznik | 0–1 | Kossowski | 60. Jubileuszowy Miedzynarodowy Festiwal Szachowy Akiby Rubinsteina - OPEN D | Scotch Game | |
| Nov 21, 2021 | Kossowski | 1–0 | Mocko | Polfinal MPJ C17 | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation | |
| Nov 20, 2021 | Strepikowski | 1–0 | Kossowski | Polfinal MPJ C17 | Ruy Lopez: Closed, Pilnik Variation | |
| Nov 19, 2021 | Kossowski | 1–0 | Celebias | Polfinal MPJ C17 | Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack | |
| Nov 18, 2021 | Kossowski | ½–½ | Smuda | Polfinal MPJ C17 | Philidor Defense: Lion Variation | |
| Nov 18, 2021 | Galeziewski | ½–½ | Kossowski | Polfinal MPJ C17 | Bogo-Indian Defense: Nimzowitsch Variation | |
| Nov 17, 2021 | Jedrzejczak | 0–1 | Kossowski | Polfinal MPJ C17 | Italian Game: Classical Variation, Greco Gambit | |
| Nov 16, 2021 | Kossowski | ½–½ | Sawicki | Polfinal MPJ C17 | Caro-Kann Defense: Classical Variation, Lobron System | |
| Nov 16, 2021 | Labedz | 1–0 | Kossowski | Polfinal MPJ C17 | Scotch Game | |
| Nov 15, 2021 | Kossowski | 1–0 | Wolny | Polfinal MPJ C17 | Sicilian Defense: Scheveningen Variation, Classical Main Line | |
