| Jun 30, 2026 | Backiel | 1–0 | Siennicki | Najdorf Memorial | English Opening: King's English Variation | |
| Jun 29, 2026 | Siennicki | 1–0 | Gorka | Najdorf Memorial | French Defense: Winawer Variation, Alekhine Gambit, Kan Variation | |
| Jun 28, 2026 | Druzd | ½–½ | Siennicki | Najdorf Memorial | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jun 27, 2026 | Leniart | 1–0 | Siennicki | Macieja Memorial | Vienna Game: Mieses Variation | |
| Jun 27, 2026 | Siennicki | 0–1 | Kruk | Macieja Memorial | Modern Defense | |
| Jun 27, 2026 | Barchuk | 1–0 | Siennicki | Macieja Memorial | Queen's Pawn Game | |
| Jun 27, 2026 | Siennicki | ½–½ | Sriram | Macieja Memorial | Pirc Defense | |
| Jun 27, 2026 | Bartel | 1–0 | Siennicki | Macieja Memorial | Vienna Game: Mieses Variation | |
| Jun 27, 2026 | Backiel | 0–1 | Siennicki | Macieja Memorial | Vienna Game: Mieses Variation | |
| Jun 27, 2026 | Siennicki | 1–0 | Stachniak | Macieja Memorial | Queen's Pawn Game: London System | |
| Jun 27, 2026 | Haladaj | ½–½ | Siennicki | Macieja Memorial | Nimzo-Indian Defense: Normal Variation | |
| Jun 27, 2026 | Siennicki | ½–½ | Kraczek | Macieja Memorial | London System | |
| Jun 27, 2026 | Borischik | 1–0 | Siennicki | Macieja Memorial | Sicilian Defense: Hyperaccelerated Dragon | |
| Jun 27, 2026 | Siennicki | 0–1 | Terkiewicz | Najdorf Memorial | Sicilian Defense: Moscow Variation | |
| Apr 13, 2025 | Graf | ½–½ | Siennicki | Columbus Mistrzostwa Polski Amatorów - do 2200 FIDE | Caro-Kann Defense: Advance Variation, Bayonet Attack | |
| Apr 8, 2025 | Siennicki | 1–0 | Siennicki | Columbus Mistrzostwa Polski Amatorów - do 2200 FIDE | Queen's Pawn Game: Symmetrical Variation | |
| Feb 9, 2025 | Pietras | ½–½ | Siennicki | Open B | Queen's Pawn Game | |
| Feb 8, 2025 | Siennicki | 1–0 | Domoradzki | Open B | Petrov's Defense: Classical Attack, Mason Variation | |
| Feb 6, 2025 | Siennicki | 0–1 | Wieczorek | Open B | Caro-Kann Defense | |
| Feb 4, 2025 | Siennicki | 1–0 | Pawlak | B | Sicilian Defense: Kalashnikov Variation | |
| Feb 4, 2025 | Makarec | 1–0 | Siennicki | B | Caro-Kann Defense: Tartakower Variation | |
| Aug 25, 2024 | Siennicki | 0–1 | Ratajek | 60. Jubileuszowy Miedzynarodowy Festiwal Szachowy Akiby Rubinsteina - OPEN D | Indian Defense | |
| Aug 17, 2024 | Siennicki | 0–1 | Wilk | 60. Jubileuszowy Miedzynarodowy Festiwal Szachowy Akiby Rubinsteina - OPEN D | Indian Defense: London System | |
| May 4, 2024 | Szumlas | * | Siennicki | Round 7: Szumlas, Tytus - Siennicki, Ludwik | ? | |
| May 3, 2024 | Cmoch | * | Siennicki | Round 5: Cmoch, Mateusz - Siennicki, Ludwik | ? | |
| May 2, 2024 | Siennicki | * | Sander | Round 4: Siennicki, Ludwik - Sander, Karol | ? | |
| May 1, 2024 | Siennicki | * | Kopia | Round 2: Siennicki, Ludwik - Kopia, Julian | ? | |
| May 1, 2024 | Fudala | * | Siennicki | Round 1: Fudala, Dominik - Siennicki, Ludwik | ? | |
| — | Siennicki | 0–1 | Suska | Rubinstein Chess Festival 2025 - OPEN A | Alekhine Defense: Brooklyn Variation | |
| — | Siennicki | 1–0 | Szymkiewicz | Rubinstein Chess Festival 2025 - OPEN A | Caro-Kann Defense: Tartakower Variation | |
| — | Siennicki | 0–1 | Meers | Rubinstein Chess Festival 2025 - OPEN A | Dutch Defense | |
| — | Siennicki | ½–½ | Zareba | Rubinstein Chess Festival 2025 - OPEN A | French Defense: Tarrasch Variation, Open System | |
| — | Futyma | 0–1 | Siennicki | Rubinstein Chess Festival 2025 - OPEN A | Scandinavian Defense: Main Line | |
| — | Tokarz | 0–1 | Siennicki | Rubinstein Chess Festival 2025 - OPEN A | Caro-Kann Defense: Advance Variation, Bayonet Attack | |
| — | Jedras | 0–1 | Siennicki | Rubinstein Chess Festival 2025 - OPEN A | Caro-Kann Defense: Advance Variation, Tal Variation | |
| — | Luberanski | 1–0 | Siennicki | Rubinstein Chess Festival 2025 - OPEN A | Caro-Kann Defense: Advance Variation, Short Variation | |
