| Oct 24, 2025 | Ramos | 0–1 | Klimaszewski | Round 4: Ramos, Angelo Bil - Klimaszewski, Dariusz | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation | |
| Oct 23, 2025 | Klimaszewski | 0–1 | Bellon Lopez | Round 3: Klimaszewski, Dariusz - Bellon Lopez, Juan Manuel | Sicilian Defense: French Variation | |
| Oct 22, 2025 | Hulse | 0–1 | Klimaszewski | Round 2: Hulse, Brian - Klimaszewski, Dariusz | King's Indian Defense: Fianchetto Variation, Carlsbad Variation | |
| Oct 21, 2025 | Klimaszewski | 1–0 | Choong | Round 1: Klimaszewski, Dariusz - Choong, Liong-On Mark | Sicilian Defense: French Variation | |
| Oct 4, 2025 | Klimaszewski | 0–1 | Pigott | European individual senior chess championship 2025 - Open 65+, Rabac, Croatia | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Oct 3, 2025 | Huss | ½–½ | Klimaszewski | European individual senior chess championship 2025 - Open 65+, Rabac, Croatia | King's Indian Defense: Petrosian Variation, Stein Defense | |
| Feb 26, 2025 | Klimaszewski | 0–1 | Haba | WSTCC | Scotch Game: Potter Variation | |
| Feb 17, 2025 | Mrva | 1–0 | Klimaszewski | WSTCC | King's Indian Defense: Semi-Averbakh System | |
| Nov 28, 2024 | Bergstrom | 1–0 | Klimaszewski | World Senior Chess Championship 2024 | Sicilian Defense: Alapin Variation, Barmen Defense | |
| Nov 27, 2024 | Klimaszewski | ½–½ | Birnboim | World Senior Chess Championship 2024 | French Defense: Advance Variation, Main Line | |
| Nov 26, 2024 | Campora | 1–0 | Klimaszewski | World Senior Chess Championship 2024 | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation | |
| Nov 25, 2024 | Klimaszewski | 1–0 | Boulard | World Senior Chess Championship 2024 | Caro-Kann Defense: Exchange Variation | |
| Nov 24, 2024 | Vatter | ½–½ | Klimaszewski | World Senior Chess Championship 2024 | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation | |
| Nov 22, 2024 | Klimaszewski | ½–½ | Maier | World Senior Chess Championship 2024 | French Defense: King's Indian Attack | |
| Nov 21, 2024 | Fernandez Garcia | 0–1 | Klimaszewski | World Senior Chess Championship 2024 | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation | |
| Nov 20, 2024 | Klimaszewski | ½–½ | Maryasin | World Senior Chess Championship 2024 | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Nov 19, 2024 | Klimaszewski | ½–½ | Nasybullin | World Senior Chess Championship 2024 | Caro-Kann Defense: Exchange Variation | |
| Nov 18, 2024 | Hugentobler | ½–½ | Klimaszewski | World Senior Chess Championship 2024 | Sicilian Defense: Closed, Traditional | |
| Jun 22, 2024 | Chojnacki | * | Klimaszewski | krakow b | ? | |
| Jun 24, 2024 | Omarsson | 1–0 | Klimaszewski | Krakow B | King's Indian Defense: Orthodox Variation, Bayonet Attack | |
| Jun 23, 2024 | Klimaszewski | 1–0 | Wolak | Krakow B | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Jun 23, 2024 | Botez | 0–1 | Klimaszewski | Krakow B | Pirc Defense | |
| Oct 26, 2023 | Klimaszewski | 0–1 | Renman | 65+ World Senior Championship | French Defense: King's Indian Attack | |
| Oct 25, 2023 | Klimaszewski | * | Baimurzin | 65+ World Senior Championship | ? | |
| Jun 18, 2023 | Klimaszewski | ½–½ | Czajkowski | Mistrzostwa Polski Seniorow 2023 | King's Indian Attack: Sicilian Variation | |
| Jun 17, 2023 | Palosz | ½–½ | Klimaszewski | Mistrzostwa Polski Seniorow 2023 | Sicilian Defense: Four Knights Variation | |
| Jun 16, 2023 | Klimaszewski | 1–0 | Stepien | Mistrzostwa Polski Seniorow 2023 | Sicilian Defense: Modern Variations | |
| Jun 15, 2023 | Klimaszewski | ½–½ | Czerwonski | Mistrzostwa Polski Seniorow 2023 | Scotch Game: Romanishin Variation | |
| Jun 15, 2023 | Bugajski | ½–½ | Klimaszewski | Mistrzostwa Polski Seniorow 2023 | King's Indian Defense: Fianchetto Variation, Carlsbad Variation | |
| Jun 14, 2023 | Pietrzak | 0–1 | Klimaszewski | Mistrzostwa Polski Seniorow 2023 | Sicilian Defense: Four Knights Variation | |
| Jun 13, 2023 | Klimaszewski | 1–0 | Rak | Mistrzostwa Polski Seniorow 2023 | Caro-Kann Defense: Exchange Variation, Rubinstein Variation | |
| Jun 12, 2023 | Klimaszewski | ½–½ | Wasik | Mistrzostwa Polski Senior�w 2023 | Caro-Kann Defense: Exchange Variation | |
| Jul 13, 2022 | Leszner | 0–1 | Klimaszewski | ESCC 50+ Lublin 2022 | Sicilian Defense: Closed, Fianchetto Variation | |
| Jul 12, 2022 | Klimaszewski | ½–½ | Wielosz | ESCC 50+ Lublin 2022 | Bird Opening | |
| Jul 11, 2022 | Druckenthaner | ½–½ | Klimaszewski | ESCC 50+ Lublin 2022 | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation | |
| Jul 10, 2022 | Klimaszewski | 0–1 | Mrva | ESCC 50+ Lublin 2022 | Scotch Game: Schmidt Variation | |
| Jul 9, 2022 | Tereladze | ½–½ | Klimaszewski | ESCC 50+ Lublin 2022 | Sicilian Defense: Old Sicilian | |
| Jul 8, 2022 | Klimaszewski | 1–0 | Lasinskas | ESCC 50+ Lublin 2022 | Ponziani Opening | |
| Jul 7, 2022 | Krzyzanowska-Zadlo | 0–1 | Klimaszewski | ESCC 50+ Lublin 2022 | Sicilian Defense: Smith-Morra Gambit Accepted | |
| Jul 6, 2022 | Klimaszewski | 1–0 | Sawiniec | ESCC 50+ Lublin 2022 | Bird Opening: Dutch Variation | |
| Jul 5, 2022 | Chwalewski | 0–1 | Klimaszewski | ESCC 50+ Lublin 2022 | Torre Attack: Fianchetto Defense | |
| — | Klimaszewski | 1–0 | Gromczak | rubinsteinE | Modern Defense: Two Knights Variation, Suttles Variation | |
| — | Klimaszewski | ½–½ | Stepien | rubinsteinE | Sicilian Defense: Chekhover Variation | |
| — | Klimaszewski | 1–0 | Marszk | rubinsteinE | Pirc Defense: Sveshnikov System | |
| — | Klimaszewski | ½–½ | Sokolowski | rubinsteinE | Sicilian Defense: Four Knights Variation | |
| — | Bartczak | 0–1 | Klimaszewski | rubinsteinE | Polish Defense | |
| — | Milanowski | ½–½ | Klimaszewski | rubinsteinE | Indian Defense | |
| — | Osiecki | 0–1 | Klimaszewski | rubinsteinE | Sicilian Defense: Alapin Variation | |
| — | Shilov | ½–½ | Klimaszewski | rubinsteinE | King's Indian Defense: Averbakh Variation, Benoni Defense, Advance Variation | |
| — | Janocha | 1–0 | Klimaszewski | rubinsteinE | King's Indian Defense: Sämisch Variation, Orthodox Variation | |