| Apr 19, 2026 | Sielicki | ½–½ | Karason | Round 1: Sielicki, Tomasz - Karason, Askell O | Queen's Gambit Declined: Harrwitz Attack, Fianchetto Defense | |
| Nov 1, 2025 | Sielicki | ½–½ | Gueci | Round 11: Sielicki, Tomasz - Gueci, Salvatore Riccardo | Indian Defense | |
| Oct 30, 2025 | Sielicki | ½–½ | Sadiku | Round 9: Sielicki, Tomasz - Sadiku, Bedri | Trompowsky Attack | |
| Oct 29, 2025 | Blasco | 0–1 | Sielicki | Round 8: Blasco, Domenico - Sielicki, Tomasz | Queen's Pawn Game: Krause Variation | |
| Oct 28, 2025 | Sielicki | 1–0 | Canonne | Round 7: Sielicki, Tomasz - Canonne, Antoine | Mikenas Defense | |
| Oct 26, 2025 | Baimurzin | 1–0 | Sielicki | Round 6: Baimurzin, Aitkazy - Sielicki, Tomasz | English Opening: King's English Variation | |
| Oct 25, 2025 | Sielicki | 1–0 | Vieira | Round 5: Sielicki, Tomasz - Vieira, Alexandre Letizio | Queen's Gambit Accepted: Alekhine Defense | |
| Oct 24, 2025 | Bogdanov | 1–0 | Sielicki | Round 4: Bogdanov, Valentin - Sielicki, Tomasz | Queen's Gambit Declined | |
| Oct 23, 2025 | Sielicki | 0–1 | Furman | Round 3: Sielicki, Tomasz - Furman, Boris | Trompowsky Attack | |
| Oct 22, 2025 | Teo | ½–½ | Sielicki | Round 2: Teo, Kok Siong - Sielicki, Tomasz | Tarrasch Defense: Dubov Tarrasch | |
| Sep 5, 2024 | Grabowski | ½–½ | Sielicki | 2liga-2 | Scotch Game: Malaniuk Variation | |
| Sep 4, 2024 | Sielicki | 0–1 | Czachor | DMP II LIga 2024 1 | Indian Defense | |
| Sep 3, 2024 | Szydelko | ½–½ | Sielicki | DMP II LIga 2024 1 | Italian Game: Classical Variation, Giuoco Pianissimo, with a6 | |
| Sep 1, 2024 | Spytek | 1–0 | Sielicki | DMP II LIga 2024 1 | Queen's Gambit Declined | |
| Aug 31, 2024 | Sielicki | ½–½ | Paprocki | DMP II LIga 2024 1 | Queen's Gambit Declined | |
| Jul 11, 2024 | Haensel | 0–1 | Sielicki | wst50 | Tarrasch Defense: Dubov Tarrasch | |
| Jul 10, 2024 | Czernicki | ½–½ | Sielicki | wst50 | Queen's Pawn Game: Krause Variation | |
| Jul 9, 2024 | Sielicki | ½–½ | Davis | wst50 | Pirc Defense: Austrian Attack, Kurajica Variation | |
| Jul 7, 2024 | Sagalchik | 1–0 | Sielicki | wstcc2024o50 | Tarrasch Defense: Two Knights Variation | |
| Jul 6, 2024 | Kirkebo | 1–0 | Sielicki | wstcc2024o50 | English Opening: King's English Variation, Reversed Sicilian | |
| Jul 5, 2024 | Sielicki | ½–½ | Burrows | wstcc2024o50 | French Defense: Exchange Variation | |
| Jul 4, 2024 | Dettmann | 1–0 | Sielicki | wstcc2024o50 | Italian Game: Classical Variation, Greco Gambit | |
| Jul 3, 2024 | Sielicki | 1–0 | Kempter | wstcc2024o50 | Trompowsky Attack: Classical Defense, Big Center Variation | |
| Jul 2, 2024 | Sielicki | ½–½ | Fleish | wstcc2024o50 | Indian Defense | |
| May 15, 2024 | Miljanic | ½–½ | Sielicki | European Senior Team Chess Championship 2024 - Section 50 + | Caro-Kann Defense: Panov Attack, Modern Defense | |
| May 8, 2024 | Sielicki | 0–1 | Jelic | European Senior Team Chess Championship 2024 - Section 50 + | Queen's Pawn Game: Levitsky Attack | |
| Jul 20, 2023 | Rasalingam | ½–½ | Sielicki | European Senior Team Chess Championship 2023 50+ | King's Gambit Accepted: Abbazia Defense | |
| Jul 19, 2023 | Sielicki | ½–½ | Zetocha | European Senior Team Chess Championship 2023 50+ | French Defense: Classical Variation, Richter Attack | |
| Jul 18, 2023 | Nordenbaek | 1–0 | Sielicki | European Senior Team Chess Championship 2023 50+ | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Jul 17, 2023 | Sielicki | 0–1 | Holmes | European Senior Team Chess Championship 2023 50+ | Trompowsky Attack | |
| Jul 16, 2023 | Emms | 1–0 | Sielicki | European Senior Team Chess Championship 2023 50+ | Queen's Gambit Declined: Tarrasch Defense, Pseudo-Tarrasch | |
| Jul 15, 2023 | Sielicki | 0–1 | Mitchell | European Senior Team Chess Championship 2023 50+ | Trompowsky Attack: Poisoned Pawn Variation | |
| Jul 14, 2023 | Sielicki | ½–½ | Setikiene | European Senior Team Chess Championship 2023 50+ | Trompowsky Attack: Classical Defense, Big Center Variation | |
| Jul 13, 2023 | Kilanski | 0–1 | Sielicki | European Senior Team Chess Championship 2023 50+ | Caro-Kann Defense: Tartakower Variation | |
| Jul 12, 2023 | Sielicki | ½–½ | Jackson | European Senior Team Chess Championship 2023 50+ | Queen's Pawn Game: Accelerated London System, Steinitz Countergambit | |
| Jul 10, 2022 | Wielosz | 1–0 | Sielicki | ESCC 50+ Lublin 2022 | Queen's Pawn Game | |
| Jul 9, 2022 | Sielicki | 0–1 | Mrva | ESCC 50+ Lublin 2022 | Philidor Defense: Lion Variation, Shirov Gambit | |
| Jul 8, 2022 | Garabetyan | ½–½ | Sielicki | ESCC 50+ Lublin 2022 | Tarrasch Defense: Two Knights Variation | |
| Jul 7, 2022 | Sielicki | 1–0 | Chlewinski | ESCC 50+ Lublin 2022 | Indian Defense | |
| Jul 6, 2022 | Tereladze | 1–0 | Sielicki | ESCC 50+ Lublin 2022 | Caro-Kann Defense: Tartakower Variation | |
| Jul 5, 2022 | Sielicki | 1–0 | Babijczuk | ESCC 50+ Lublin 2022 | Dutch Defense: Hopton Attack | |
| Oct 25, 2021 | Hamad | * | Sielicki | FIDE World Amateur 2021 U2000 | ? | |
| Oct 24, 2021 | Sielicki | * | Stathatos | FIDE World Amateur 2021 U2000 | ? | |
| Oct 23, 2021 | Tenuunbold | * | Sielicki | FIDE World Amateur 2021 U2000 | ? | |
| Oct 22, 2021 | Sielicki | ½–½ | Ehab | FIDE World Amateur 2021 U2000 | Slav Defense: Exchange Variation | |
| Oct 21, 2021 | Kovalskyi | * | Sielicki | FIDE World Amateur 2021 U2000 | ? | |
| Oct 20, 2021 | Sielicki | ½–½ | Zielinski | FIDE World Amateur 2021 U2000 | Indian Defense | |
| Oct 19, 2021 | Tarnowska | ½–½ | Sielicki | FIDE World Amateur 2021 U2000 | Ruy Lopez: Schliemann Defense, Schönemann Attack | |
| Oct 18, 2021 | Sielicki | * | Hamad | FIDE World Amateur 2021 U2000 | ? | |
| Jul 29, 2021 | Sielicki | * | Karsay | 14th Paleochora International Tournament | ? | |
| Jul 27, 2021 | Louis | * | Sielicki | 13th International Tournament of Paleochora | ? | |
| Jul 26, 2021 | Sielicki | * | Athanasakopoulos | 14th Paleochora International Tournament | ? | |
| Jul 26, 2021 | Sielicki | * | Athanasakopoulos | 13th International Tournament of Paleochora | ? | |
| Jul 24, 2021 | Sielicki | * | Mavromoustakos | 13th International Tournament of Paleochora | ? | |
| Jul 18, 2021 | Sielicki | ½–½ | Kaminski | Warsaw Najdorf Festival | ? | |
| — | Sielicki | 1–0 | Posnik | rubinsteinE | Trompowsky Attack | |
| — | Sielicki | 1–0 | Majdziak | rubinsteinE | Rapport-Jobava System | |
| — | Sielicki | 1–0 | Czepczynski | rubinsteinE | Modern Defense: Pseudo-Austrian Attack | |
| — | Sielicki | 0–1 | Janocha | rubinsteinE | Rapport-Jobava System | |
| — | Sielicki | 0–1 | Stepien | rubinsteinE | ? | |
| — | Fikus | ½–½ | Sielicki | rubinsteinE | Richter-Veresov Attack: Richter Variation | |
| — | Szydelko | ½–½ | Sielicki | rubinsteinE | Queen's Gambit Declined: Semi-Tarrasch Defense | |
| — | Kolodziej | ½–½ | Sielicki | rubinsteinE | Caro-Kann Defense: Panov Attack, Modern Defense, Mieses Line | |
| — | Kawula | 0–1 | Sielicki | rubinsteinE | Blumenfeld Countergambit Accepted | |