| Jun 30, 2026 | Sieciechowicz | ½–½ | Tytynnik | Najdorf Memorial | King's Indian Attack: Pachman System | |
| Jun 29, 2026 | Sprzeczka | 0–1 | Sieciechowicz | Najdorf Memorial | Slav Defense: Exchange Variation, Symmetrical Line | |
| Jun 28, 2026 | Sieciechowicz | ½–½ | Sujkowski | Najdorf Memorial | Queen's Gambit Accepted: Normal Variation, Traditional System | |
| Jun 27, 2026 | Sieciechowicz | 1–0 | Mulawa | Macieja Memorial | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Jun 27, 2026 | Krzyzanowski | 1–0 | Sieciechowicz | Macieja Memorial | Zukertort Opening: Nimzo-Larsen Variation | |
| Jun 27, 2026 | Sieciechowicz | 1–0 | Kazakouski | Macieja Memorial | Rat Defense: English Rat | |
| Jun 27, 2026 | Terkiewicz | 0–1 | Sieciechowicz | Macieja Memorial | Grünfeld Defense: Brinckmann Attack | |
| Jun 27, 2026 | Sieciechowicz | 1–0 | Socko | Macieja Memorial | Nimzo-Indian Defense: Classical Variation | |
| Jun 27, 2026 | Kubicka | 1–0 | Sieciechowicz | Macieja Memorial | Sicilian Defense: Keres Variation | |
| Jun 27, 2026 | Sieciechowicz | 1–0 | Backiel | Macieja Memorial | Semi-Slav Defense: Marshall Gambit, Forgotten Variation | |
| Jun 27, 2026 | Stachniak | 0–1 | Sieciechowicz | Macieja Memorial | Zukertort Opening: Nimzo-Larsen Variation | |
| Jun 27, 2026 | Sieciechowicz | 0–1 | Dardha | Macieja Memorial | Nimzo-Indian Defense: Classical Variation, Berlin Variation | |
| Jun 27, 2026 | Sieciechowicz | 1–0 | Wolak | Macieja Memorial | Nimzo-Indian Defense: Normal Variation, Botvinnik System | |
| Jun 27, 2026 | Lewczuk | 0–1 | Sieciechowicz | Macieja Memorial | Bird Opening: Dutch Variation | |
| Jun 27, 2026 | Zajac | ½–½ | Sieciechowicz | Najdorf Memorial | King's Indian Attack: Double Fianchetto | |
| Apr 19, 2026 | Sieciechowicz | 0–1 | Walaszczyk | EICC 2026 | Anderssen's Opening | |
| Apr 18, 2026 | Szczurek | ½–½ | Sieciechowicz | EICC 2026 | Sicilian Defense: Hyperaccelerated Fianchetto | |
| Apr 16, 2026 | Moroni | ½–½ | Sieciechowicz | EICC 2026 | Queen's Pawn Game: Symmetrical Variation | |
| Apr 15, 2026 | Sieciechowicz | ½–½ | Acs | EICC 2026 | King's Indian Attack: Symmetrical Defense | |
| Apr 14, 2026 | Sieciechowicz | 1–0 | Gov | EICC 2026 | King's Indian Attack: Keres Variation | |
| Apr 13, 2026 | Amar | 1–0 | Sieciechowicz | EICC 2026 | French Defense: Advance Variation, Wade Variation | |
| Apr 12, 2026 | Sieciechowicz | 1–0 | Nowak | EICC 2026 | Zukertort Opening: Sicilian Invitation | |
| Apr 10, 2026 | Tezcan | ½–½ | Sieciechowicz | EIIC 2026 | Four Knights Game: Scotch Variation Accepted, Main Line | |
| Apr 9, 2026 | Sieciechowicz | 0–1 | Subelj | EICC 2026 | Semi-Slav Defense: Anti-Moscow Gambit | |
| Apr 8, 2026 | Meshkovs | ½–½ | Sieciechowicz | EICC 2026 | Semi-Slav Defense: Stoltz Variation | |
| Apr 7, 2026 | Sieciechowicz | 1–0 | Wasiluk | EIIC 2026 | Nimzo-Indian Defense: Classical Variation, Noa Variation | |
| Mar 22, 2026 | Sukovic | ½–½ | Sieciechowicz | Round 5: Sukovic, Andrej - Sieciechowicz, Marcin | Ruy Lopez: Open Berlin Defense, l'Hermet Variation | |
| Mar 22, 2026 | Sieciechowicz | 0–1 | Bosiocic | Round 4: Sieciechowicz, Marcin - Bosiocic, Marin | Nimzo-Indian Defense: Kmoch Variation | |
| Mar 21, 2026 | Di Giacinto | 1–0 | Sieciechowicz | Round 3: Di Giacinto, Gaudio - Sieciechowicz, Marcin | Nimzo-Larsen Attack: Classical Variation | |
| Mar 21, 2026 | Sieciechowicz | ½–½ | Krstulovic | Round 2: Sieciechowicz, Marcin - Krstulovic, Alex | Grünfeld Defense: Exchange Variation, Classical Variation | |
| Mar 18, 2026 | Sieciechowicz | ½–½ | Klimkowski | Round 1: Sieciechowicz, Marcin - Klimkowski, Jan | Queen's Gambit Declined: Barmen Variation | |
| Oct 4, 2025 | Sieciechowicz | 1–0 | Cyborowski | MP-rapid25 | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Oct 4, 2025 | Rog | 0–1 | Sieciechowicz | MP-rapid25 | Sicilian Defense: Alapin Variation | |
| Oct 4, 2025 | Sieciechowicz | 1–0 | Hury | MP-rapid25 | King's Indian Defense: Semi-Averbakh System | |
| Oct 4, 2025 | Pakleza | 1–0 | Sieciechowicz | MP-rapid25 | Queen's Pawn Game: London System | |
| Oct 4, 2025 | Sieciechowicz | 1–0 | Liskiewicz | MP-rapid25 | Nimzo-Indian Defense: Classical Variation, Milner-Barry Variation | |
| Oct 4, 2025 | Kaliszuk | 0–1 | Sieciechowicz | MP-rapid25 | Scotch Game: Schmidt Variation | |
| Oct 4, 2025 | Bartoszewicz | ½–½ | Sieciechowicz | MP-rapid25 | Sicilian Defense: Najdorf Variation, Opocensky Variation, Traditional Line | |
| Oct 4, 2025 | Sieciechowicz | 1–0 | Somyk | MP-rapid25 | Tarrasch Defense: Two Knights Variation | |
| Sep 13, 2025 | Sieciechowicz | 1–0 | Krasenkow | TCQ | Rat Defense: English Rat | |
| Sep 13, 2025 | Kucza | 0–1 | Sieciechowicz | TCQ | Sicilian Defense: Najdorf Variation, Poisoned Pawn Accepted | |
| Sep 13, 2025 | Sieciechowicz | 1–0 | Derejczyk | TCQ | Queen's Gambit Declined: Charousek Variation | |
| Sep 13, 2025 | Smeryk | ½–½ | Sieciechowicz | TCQ | French Defense: Wing Gambit | |
| Sep 13, 2025 | Serdiuk | 0–1 | Sieciechowicz | TCQ | French Defense: Exchange Variation | |
| Sep 13, 2025 | Sieciechowicz | 1–0 | Swiderski | TCQ | Nimzo-Indian Defense: Classical Variation, Noa Variation | |
| Sep 13, 2025 | Krzyzanowski | 0–1 | Sieciechowicz | TCQ | Queen's Gambit Declined: Neo-Orthodox Variation, Main Line | |
| Sep 13, 2025 | Sieciechowicz | 1–0 | Babinska | TCQ | Slav Defense: Czech Variation, Bled Attack | |
| Sep 12, 2025 | Sieciechowicz | 0–1 | Teclaf | TCQ | English Defense | |
| Sep 6, 2025 | Dziuba | 1–0 | Sieciechowicz | 2 liga 2025 1 | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Sep 3, 2025 | Suder | ½–½ | Sieciechowicz | 2 liga 2025 1 | English Opening: Agincourt Defense | |
| Sep 3, 2025 | Sieciechowicz | 1–0 | Ugorek | 2 liga 2025 1 | Queen's Gambit Accepted: Normal Variation | |
| Sep 3, 2025 | Marczuk | 0–1 | Sieciechowicz | 2 liga 2025 1 | Italian Game: Giuoco Piano | |
| Sep 3, 2025 | Sieciechowicz | ½–½ | Cyfka | 2 liga 2025 1 | Nimzo-Indian Defense: Classical Variation, Noa Variation | |
| Sep 2, 2025 | Sieciechowicz | 1–0 | Czernek | 2 liga 2025 1 | Nimzo-Indian Defense: Classical Variation | |
| Sep 1, 2025 | Kindler | 0–1 | Sieciechowicz | 2 liga 2025 1 | Italian Game: Classical Variation, Greco Gambit, Traditional Line | |
| Sep 22, 2024 | Galperin | 1–0 | Sieciechowicz | 1liga1 | Slav Defense: Exchange Variation | |
| Sep 21, 2024 | Sieciechowicz | 1–0 | Kucza | 1liga1 | Queen's Indian Defense: Classical Variation, Traditional Variation | |
| Sep 20, 2024 | Solodovnichenko | 1–0 | Sieciechowicz | 1liga1 | French Defense: Winawer Variation, Bogoljubow Variation | |
| Sep 19, 2024 | Sieciechowicz | ½–½ | Stachowiak | 1liga1 | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Sep 18, 2024 | Pacan-Milej | ½–½ | Sieciechowicz | 1liga1 | Slav Defense: Exchange Variation | |
| Sep 17, 2024 | Sieciechowicz | ½–½ | Zylka | 1liga1 | Queen's Gambit Accepted: Furman Variation | |
| Sep 16, 2024 | Eggink | ½–½ | Sieciechowicz | 1liga1 | Grünfeld Defense: Exchange Variation, Modern Exchange Variation | |
| Sep 15, 2024 | Sieciechowicz | ½–½ | Mickiewicz | 1liga2 | Nimzo-Indian Defense: Rubinstein System | |
| Sep 14, 2024 | Niedbala | 1–0 | Sieciechowicz | 1liga1 | Grünfeld Defense: Exchange Variation | |
| Sep 3, 2024 | Sieciechowicz | ½–½ | Teclaf | Festival | Nimzo-Indian Defense: Classical Variation | |
| Sep 2, 2024 | Md Imran | ½–½ | Sieciechowicz | Festival | Zukertort Opening: Nimzo-Larsen Variation | |
| Sep 1, 2024 | Sieciechowicz | ½–½ | Brodowski | Festival | Indian Defense | |
| Aug 31, 2024 | Hnydiuk | ½–½ | Sieciechowicz | Festival | Sicilian Defense: Moscow Variation, Moscow Gambit | |
| Aug 30, 2024 | Sieciechowicz | ½–½ | Socko | Festival | Nimzo-Indian Defense: Classical Variation | |
| Aug 29, 2024 | Madej | 0–1 | Sieciechowicz | Festival | Sicilian Defense: Najdorf Variation, Opocensky Variation | |
| Aug 28, 2024 | Sieciechowicz | ½–½ | Gumularz | Festival | Nimzo-Indian Defense: Classical Variation | |
| Aug 27, 2024 | Janeczko | 0–1 | Sieciechowicz | Festival | Sicilian Defense: Moscow Variation | |
| Aug 26, 2024 | Sieciechowicz | 1–0 | Paprocki | Festival | Kangaroo Defense | |
| Aug 14, 2024 | Sieciechowicz | 1–0 | Babiarz | anderssenA2024 | Queen's Gambit Accepted: Furman Variation | |
| Aug 13, 2024 | Rozentalis | ½–½ | Sieciechowicz | anderssenA2024 | Ruy Lopez: Berlin Defense | |
| Aug 12, 2024 | Sieciechowicz | ½–½ | Gibala | anderssenA2024 | Nimzo-Indian Defense: Classical Variation, Milner-Barry Variation | |
| Aug 12, 2024 | Mis | 1–0 | Sieciechowicz | anderssenA2024 | English Opening: Anglo-Indian Defense, Anglo-Grünfeld Variation | |
| Aug 11, 2024 | Sieciechowicz | 1–0 | Hourigan | anderssenA2024 | Queen's Gambit Declined: Austrian Defense | |
| Aug 10, 2024 | Sieciechowicz | ½–½ | Koziorowicz | anderssenA2024 | Nimzo-Indian Defense: Classical Variation, Noa Variation | |
| Aug 9, 2024 | Sieciechowicz | 1–0 | Rainer | anderssenA2024 | Semi-Slav Defense | |
| Aug 9, 2024 | Bhagat Kush | 0–1 | Sieciechowicz | anderssenA2024 | Grünfeld Defense: Exchange Variation | |
| Aug 8, 2024 | Sygulski | ½–½ | Sieciechowicz | anderssenA2024 | Neo-Grünfeld Defense: Exchange Variation | |
| Jun 29, 2024 | Sieciechowicz | 1–0 | Nurgaliyev | krakow a | Grünfeld Defense: Exchange Variation | |
| Jun 28, 2024 | Citak | ½–½ | Sieciechowicz | krakow a | French Defense: Tarrasch Variation, Chistyakov Defense | |
| Jun 27, 2024 | Sieciechowicz | ½–½ | Gorkiewicz | krakow a | Queen's Gambit Accepted: Central Variation, McDonnell Defense | |
| Jun 26, 2024 | Rozentalis | 1–0 | Sieciechowicz | krakow a | French Defense: Tarrasch Variation, Chistyakov Defense | |
| Jun 25, 2024 | Sieciechowicz | 1–0 | Fier | krakow a | Nimzo-Indian Defense: Classical Variation, Noa Variation | |
| Jun 24, 2024 | Kosakowski | ½–½ | Sieciechowicz | krakow a | French Defense: Tarrasch Variation, Open System, Euwe-Keres Line | |
| Jun 23, 2024 | Sieciechowicz | 1–0 | Mahitosh Dey | krakow a | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Jun 23, 2024 | Janeczko | ½–½ | Sieciechowicz | krakow a | Bishop's Opening: Vienna Hybrid | |
| Jun 22, 2024 | Sieciechowicz | 1–0 | Vortmeier | krakow a | King's Indian Defense: Semi-Averbakh System | |
| Jun 2, 2024 | Brzezina | ½–½ | Sieciechowicz | GRA | Slav Defense: Quiet Variation, Pin Defense | |
| Jun 1, 2024 | Sieciechowicz | 1–0 | Brozyna | GRA | Semi-Slav Defense | |
| May 31, 2024 | Sieciechowicz | 1–0 | Michalowski | GRA | Queen's Gambit Declined: Charousek Variation | |
| May 31, 2024 | Mirski | ½–½ | Sieciechowicz | GRA | Queen's Pawn Game: Symmetrical Variation, Pseudo-Catalan | |
| May 30, 2024 | Sieciechowicz | 1–0 | Hnatyshyn | GRA | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Mar 24, 2024 | Grzesik | 0–1 | Sieciechowicz | Round 11: Grzesik, Gracjan - Sieciechowicz, Marcin | Slav Defense | |
| Mar 24, 2024 | Sieciechowicz | 1–0 | Maj | Round 10: Sieciechowicz, Marcin - Maj, Andrzej | Slav Defense: Czech Variation, Wiesbaden Variation, Sharp Line | |
| Mar 24, 2024 | Sieciechowicz | ½–½ | Plichta | Round 9: Sieciechowicz, Marcin - Plichta, Kamil | Queen's Pawn Game: Modern Defense | |
| Mar 24, 2024 | Sernecki | 1–0 | Sieciechowicz | Round 8: Sernecki, Franciszek - Sieciechowicz, Marcin | Semi-Slav Defense: Stoltz Variation | |