| Jun 5, 2026 | Dobrowolski | 1–0 | Kowalczuk | Deweloperni_Mistrzostwa_Polski_w_Szachach_Blyskawicznych | Owen Defense | |
| Jun 5, 2026 | Kowalczuk | 0–1 | Przedmojski | Deweloperni_Mistrzostwa_Polski_w_Szachach_Blyskawicznych | French Defense: Tarrasch Variation | |
| Jun 5, 2026 | Kowalczuk | 0–1 | Lach | Deweloperni_Mistrzostwa_Polski_w_Szachach_Blyskawicznych | Sicilian Defense: Accelerated Dragon | |
| Jun 4, 2026 | Kowalczuk | 0–1 | Lach | Deweloperni_Mistrzostwa_Polski_w_Szachach_Szybkich | Sicilian Defense: Old Sicilian | |
| Jun 4, 2026 | Kowalczuk | 0–1 | Slaby | Deweloperni_Mistrzostwa_Polski_w_Szachach_Szybkich | Caro-Kann Defense | |
| Apr 19, 2026 | Kowalczuk | ½–½ | Arnason | Round 1: Kowalczuk, Wojciech - Arnason, Jon L | Four Knights Game: Scotch Variation Accepted | |
| Nov 1, 2025 | Boulard | 1–0 | Kowalczuk | Round 11: Boulard, Eric - Kowalczuk, Wojciech | English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, with Nb6 | |
| Oct 31, 2025 | Taylor | 0–1 | Kowalczuk | Round 10: Taylor, Timothy - Kowalczuk, Wojciech | Catalan Opening: Closed, Botvinnik Variation | |
| Oct 30, 2025 | Kowalczuk | 1–0 | Allakhverdiev | Round 9: Kowalczuk, Wojciech - Allakhverdiev, Eduard | Elephant Gambit | |
| Oct 29, 2025 | Koehler | 1–0 | Kowalczuk | Round 8: Koehler, Gerhard, Dr. - Kowalczuk, Wojciech | Queen's Indian Defense: Kasparov Variation | |
| Oct 28, 2025 | Kowalczuk | 1–0 | Teo | Round 7: Kowalczuk, Wojciech - Teo, Kok Siong | Sicilian Defense: Kan Variation, Modern Variation | |
| Oct 26, 2025 | Kowalczuk | 1–0 | Di Lascio | Round 6: Kowalczuk, Wojciech - Di Lascio, Savino | Caro-Kann Defense: Bronstein-Larsen Variation | |
| Oct 25, 2025 | Petran | 1–0 | Kowalczuk | Round 5: Petran, Peter - Kowalczuk, Wojciech | Hungarian Opening | |
| Oct 24, 2025 | Kowalczuk | ½–½ | Vehi Bach | Round 4: Kowalczuk, Wojciech - Vehi Bach, Victor Manuel | Sicilian Defense: Kan Variation, Maróczy Bind, Réti Variation | |
| Oct 23, 2025 | Henttinen | ½–½ | Kowalczuk | Round 3: Henttinen, Markku I.O. - Kowalczuk, Wojciech | Queen's Gambit Declined: Harrwitz Attack, Fianchetto Defense | |
| Oct 22, 2025 | Kowalczuk | 1–0 | Shaw | Round 2: Kowalczuk, Wojciech - Shaw, Clifford | French Defense: Chigorin Variation | |
| Sep 27, 2025 | Renman | 0–1 | Kowalczuk | European individual senior chess championship 2025 - Open 65+, Rabac, Croatia | Semi-Slav Defense: Meran Variation | |
| Nov 21, 2024 | Maier | 1–0 | Kowalczuk | World Senior Chess Championship 2024 | Petrov's Defense: Three Knights Game | |
| Aug 25, 2024 | Mazalon | 0–1 | Kowalczuk | 60. Jubileuszowy Mi?dzynarodowy Festiwal Szachowy Akiby Rubinsteina - OPEN C | Queen's Gambit Accepted: Classical Defense, Rubinstein Variation | |
| Aug 24, 2024 | Kowalczuk | ½–½ | Tust-Kopec | 60. Jubileuszowy Mi?dzynarodowy Festiwal Szachowy Akiby Rubinsteina - OPEN C | Ponziani Opening: Jaenisch Counterattack | |
| Aug 23, 2024 | Fikus | 0–1 | Kowalczuk | 60. Jubileuszowy Miedzynarodowy Festiwal Szachowy Akiby Rubinsteina - OPEN C | Scandinavian Defense: Modern Variation, Gipslis Variation | |
| Aug 22, 2024 | Kowalczuk | 1–0 | Wasylkiewicz | 60. Jubileuszowy Miedzynarodowy Festiwal Szachowy Akiby Rubinsteina - OPEN C | Scandinavian Defense: Main Line, Mieses Variation | |
| Aug 21, 2024 | Kruczynski | ½–½ | Kowalczuk | 60. Jubileuszowy Miedzynarodowy Festiwal Szachowy Akiby Rubinsteina - OPEN C | Sicilian Defense: Closed, Chameleon Variation | |
| Aug 19, 2024 | Szydelko | ½–½ | Kowalczuk | 60. Jubileuszowy Mi?dzynarodowy Festiwal Szachowy Akiby Rubinsteina - OPEN C | Slav Defense | |
| Aug 18, 2024 | Kowalczuk | ½–½ | Skubis | 60. Jubileuszowy Mi?dzynarodowy Festiwal Szachowy Akiby Rubinsteina - OPEN C | Sicilian Defense: Chekhover Variation | |
| Aug 17, 2024 | Nowak | 0–1 | Kowalczuk | 60. Jubileuszowy Mi?dzynarodowy Festiwal Szachowy Akiby Rubinsteina - OPEN C | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Aug 14, 2024 | Xu | 1–0 | Kowalczuk | Festiwal Adolfa Anderssena 2024 B | Queen's Gambit Declined: Three Knights Variation | |
| Aug 13, 2024 | Kowalczuk | 1–0 | Tyran | Festiwal Adolfa Anderssena 2024 B | Sicilian Defense: Kan Variation, Polugaevsky Variation | |
| Aug 12, 2024 | Kowalczuk | 0–1 | Szopa | Festiwal Adolfa Anderssena 2024 B | Caro-Kann Defense: Karpov Variation, Modern Variation, Kasparov Attack | |
| Aug 12, 2024 | Kaluszynski | 0–1 | Kowalczuk | Festiwal Adolfa Anderssena 2024 B | English Opening: Anglo-Indian Defense | |
| Aug 11, 2024 | Trybus | 1–0 | Kowalczuk | Festiwal Adolfa Anderssena 2024 B | Scotch Game: Potter Variation | |
| Aug 10, 2024 | Kowalczuk | 1–0 | Herrmann | Festiwal Adolfa Anderssena 2024 B | Modern Defense | |
| Aug 9, 2024 | Kowalczuk | ½–½ | Paluszek | Festiwal Adolfa Anderssena 2024 B | French Defense: Advance Variation | |
| Aug 9, 2024 | Grech | 1–0 | Kowalczuk | Festiwal Adolfa Anderssena 2024 B | Nimzo-Indian Defense: Kmoch Variation | |
| Aug 8, 2024 | Romero Barkouk | 0–1 | Kowalczuk | Festiwal Adolfa Anderssena 2024 B | Caro-Kann Defense: Two Knights Attack | |
| Jul 20, 2023 | Kowalczuk | ½–½ | Burnett | European Senior Team Chess Championship 2023 50+ | Sicilian Defense: Modern Variations, Anti-Qxd4 Move Order Accepted | |
| Jul 19, 2023 | Lalic | 0–1 | Kowalczuk | European Senior Team Chess Championship 2023 50+ | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jul 18, 2023 | Kowalczuk | ½–½ | Hill | European Senior Team Chess Championship 2023 50+ | Sicilian Defense: Hyperaccelerated Fianchetto | |
| Jul 17, 2023 | Mrva | 1–0 | Kowalczuk | European Senior Team Chess Championship 2023 50+ | Sicilian Defense: French Variation | |
| Jul 16, 2023 | Kowalczuk | ½–½ | Rewitz | European Senior Team Chess Championship 2023 50+ | Caro-Kann Defense: Tartakower Variation | |
| Jul 15, 2023 | Buckley | 1–0 | Kowalczuk | European Senior Team Chess Championship 2023 50+ | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Jul 14, 2023 | Kowalczuk | 0–1 | Hebden | European Senior Team Chess Championship 2023 50+ | Italian Game: Scotch Gambit, Max Lange Attack | |
| Jul 13, 2023 | Osiecki | 1–0 | Kowalczuk | European Senior Team Chess Championship 2023 50+ | Petrov's Defense: Modern Attack, Center Variation | |
| Jul 12, 2023 | Kowalczuk | 1–0 | Baliuniene | European Senior Team Chess Championship 2023 50+ | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| — | Kowalczuk | 1–0 | Norder | wroclaw SENIOR OPEN | Lion Defense: Anti-Philidor, Lion's Cave | |
| — | Kowalczuk | 1–0 | Delaruelle | wroclaw SENIOR OPEN | Italian Game: Two Knights Defense, Polerio Defense, Bishop Check Line | |
| — | Kowalczuk | ½–½ | Rogowski | wroclaw SENIOR OPEN | Sicilian Defense: Kan Variation, Modern Variation | |
| — | Kowalczuk | ½–½ | Bielinski | wroclaw SENIOR OPEN | Rat Defense: Accelerated Gurgenidze | |
| — | Kowalczuk | ½–½ | Tomalak | rubinsteinE | Scotch Game: Mieses Variation | |
| — | Kowalczuk | ½–½ | Pyka | rubinsteinE | Scandinavian Defense: Main Line, Mieses Variation | |
| — | Kowalczuk | 1–0 | Bernat | rubinsteinE | French Defense: Chigorin Variation | |
| — | Kowalczuk | ½–½ | Osiecki | rubinsteinE | French Defense: Chigorin Variation | |
| — | Kowalczuk | 1–0 | Friml | rubinsteinE | Sicilian Defense: Najdorf Variation, Lipnitsky Attack | |
| — | Bohdanowicz | ½–½ | Kowalczuk | wroclaw SENIOR OPEN | Vienna Game: Vienna Gambit, Main Line | |
| — | Josse | * | Kowalczuk | wroclaw SENIOR OPEN | French Defense: Rubinstein Variation, Blackburne Defense | |
| — | Alvarado | 0–1 | Kowalczuk | wroclaw SENIOR OPEN | Zukertort Opening: Quiet System | |
| — | Stec | ½–½ | Kowalczuk | wroclaw SENIOR OPEN | Petrov's Defense: French Attack | |
| — | Hilarecki | ½–½ | Kowalczuk | wroclaw SENIOR OPEN | Queen's Gambit Accepted: Classical Defense, Alekhine System, Main Line | |
| — | Wziatek | 0–1 | Kowalczuk | rubinsteinE | English Opening: Agincourt Defense | |
| — | Kolodziej | ½–½ | Kowalczuk | rubinsteinE | Philidor Defense | |
| — | Wierzbicka | 1–0 | Kowalczuk | rubinsteinE | King's Indian Attack: Wahls Defense | |
| — | Poniewierski | ½–½ | Kowalczuk | rubinsteinE | Queen's Pawn Game: Symmetrical Variation | |