| Jun 5, 2026 | Przedmojski | 0–1 | Olszewski | Deweloperni_Mistrzostwa_Polski_w_Szachach_Blyskawicznych | Queen's Pawn Game: Barry Attack, Grünfeld Variation | |
| Jun 5, 2026 | Olszewski | 1–0 | Heberla | Deweloperni_Mistrzostwa_Polski_w_Szachach_Blyskawicznych | Zukertort Opening: Dutch Variation | |
| Jun 5, 2026 | Nasuta | 0–1 | Olszewski | Deweloperni_Mistrzostwa_Polski_w_Szachach_Blyskawicznych | Sicilian Defense: Najdorf Variation, Lipnitsky Attack | |
| Jun 5, 2026 | Olszewski | 1–0 | Dobrowolski | Deweloperni_Mistrzostwa_Polski_w_Szachach_Blyskawicznych | Queen's Gambit Accepted: Classical Defense, Rubinstein Variation | |
| Jun 5, 2026 | Lewandowski | 0–1 | Olszewski | Deweloperni_Mistrzostwa_Polski_w_Szachach_Blyskawicznych | Sicilian Defense: Najdorf Variation | |
| Jun 5, 2026 | Olszewski | 0–1 | Jedynak | Deweloperni_Mistrzostwa_Polski_w_Szachach_Blyskawicznych | French Defense: Winawer Variation, Portisch-Hook Variation | |
| Jun 5, 2026 | Olszewski | ½–½ | Staroszczyk | Deweloperni_Mistrzostwa_Polski_w_Szachach_Blyskawicznych | Semi-Slav Defense: Chigorin Defense | |
| Jun 1, 2026 | Olszewski | 0–1 | Slaby | Deweloperni_Mistrzostwa_Polski_w_Szachach_Blyskawicznych | Zukertort Opening | |
| Jun 1, 2026 | Olszewski | ½–½ | Socko | Deweloperni_Mistrzostwa_Polski_w_Szachach_Blyskawicznych | Zukertort Opening: Quiet System | |
| Apr 19, 2026 | Olszewski | ½–½ | Vardanyan | EICC 2026 | Sicilian Defense: Classical Variation | |
| Apr 18, 2026 | Tadic | 0–1 | Olszewski | EICC 2026 | Sicilian Defense: Kan Variation, Polugaevsky Variation | |
| Apr 16, 2026 | Olszewski | 1–0 | Perossa | EICC 2026 | Rapport-Jobava System | |
| Apr 15, 2026 | Rybka | ½–½ | Olszewski | EICC 2026 | Sicilian Defense: Kan Variation, Polugaevsky Variation | |
| Apr 14, 2026 | Olszewski | 0–1 | Bettalli | EICC 2026 | Zukertort Opening | |
| Apr 13, 2026 | Goroshkov | 0–1 | Olszewski | EICC 2026 | Sicilian Defense: Alapin Variation, Stoltz Attack, Ivanchuk Line | |
| Apr 12, 2026 | Olszewski | 0–1 | Injac | EICC 2026 | Zukertort Opening: Sicilian Invitation | |
| Apr 10, 2026 | Lyakh | ½–½ | Olszewski | EICC 2026 | Indian Defense: Anti-Nimzo-Indian | |
| Apr 9, 2026 | Olszewski | ½–½ | Pasti | EICC 2026 | Zukertort Opening | |
| Apr 8, 2026 | Mkrtchyan | 0–1 | Olszewski | EICC 2026 | King's Indian Defense: Fianchetto Variation, Immediate Fianchetto | |
| Apr 7, 2026 | Olszewski | 1–0 | Lecki | EICC 2026 | Zukertort Opening: Sicilian Invitation | |
| Oct 4, 2025 | Piotrowski | 1–0 | Olszewski | MP-rapid25 | Indian Defense: Knights Variation | |
| Oct 4, 2025 | Olszewski | 1–0 | Derejczyk | MP-rapid25 | Caro-Kann Defense: Advance Variation, Short Variation | |
| Oct 4, 2025 | Kaliszuk | ½–½ | Olszewski | MP-rapid25 | Sicilian Defense: Chekhover Variation | |
| Oct 4, 2025 | Olszewski | 1–0 | Kopinski | MP-rapid25 | French Defense: Classical Variation, Shirov-Anand Variation | |
| Oct 4, 2025 | Bilochenko | 1–0 | Olszewski | MP-rapid25 | King's Indian Defense: Orthodox Variation, Positional Defense | |
| Oct 4, 2025 | Olszewski | ½–½ | Lasok | MP-rapid25 | Sicilian Defense: O'Kelly Variation, Maróczy Bind, Geller Line | |
| Oct 4, 2025 | Owczarek | 0–1 | Olszewski | MP-rapid25 | Nimzo-Indian Defense: Sämisch Variation | |
| Oct 8, 2022 | Olszewski | 1–0 | Przybylski | PGNiG TERMIKA Polish Cup - Bydgoszcz | Qualification | Caro-Kann Defense: Advance Variation, Short Variation | |
| Oct 8, 2022 | Olszewski | 1–0 | Kowalski | PGNiG TERMIKA Polish Cup - Bydgoszcz | Qualification | Modern Defense: Standard Defense | |
| Oct 8, 2022 | Olszewski | 1–0 | Seemann | PGNiG TERMIKA Polish Cup - Bydgoszcz | Qualification | Sicilian Defense: Najdorf Variation, English Attack | |
| Oct 8, 2022 | Olszewski | 1–0 | Szpar | PGNiG TERMIKA Polish Cup - Bydgoszcz | Qualification | Sicilian Defense: Classical Variation | |
| Oct 8, 2022 | Budzisz | ½–½ | Olszewski | PGNiG TERMIKA Polish Cup - Bydgoszcz | Qualification | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Oct 8, 2022 | Maciejewski | 0–1 | Olszewski | PGNiG TERMIKA Polish Cup - Bydgoszcz | Qualification | Italian Game: Scotch Gambit, Max Lange Attack | |
| Oct 8, 2022 | Janik | 1–0 | Olszewski | PGNiG TERMIKA Polish Cup - Bydgoszcz | Qualification | Italian Game: Two Knights Defense, Polerio Defense, Bishop Check Line | |
| Oct 8, 2022 | Sliwicka | 0–1 | Olszewski | PGNiG TERMIKA Polish Cup - Bydgoszcz | Qualification | Four Knights Game: Gunsberg Variation | |
| Sep 5, 2022 | Olszewski | ½–½ | Gumularz | Enea - DMP Ekstraliga | Queen's Gambit Declined: Three Knights Variation | |
| Sep 4, 2022 | Kanarek | ½–½ | Olszewski | Druzynowe Mistrzowa Polski Ekstraliga | Ruy Lopez: Closed, Breyer Defense, Zaitsev Hybrid | |
| Sep 3, 2022 | Teclaf | ½–½ | Olszewski | Enea - DMP Ekstraliga | East Indian Defense | |