| — | Niermann | ½–½ | Karas | Grenke Open | French Defense: Schlechter Variation | |
| — | Niermann | ½–½ | Bomans | Grenke Open | English Opening: Symmetrical Variation | |
| — | Dathe | ½–½ | Niermann | Grenke Open | Réti Opening: Anglo-Slav Variation, Bogoljubow Variation | |
| Nov 23, 2025 | Henning | 1–0 | Niermann | Round 9: Henning, Marvin - Niermann, Tristan | Sicilian Defense: Delayed Alapin Variation, with d6 | |
| Nov 23, 2025 | Mazurtsova | 0–1 | Niermann | Round 8: Mazurtsova, Margarita - Niermann, Tristan | English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation | |
| Nov 23, 2025 | Niermann | 0–1 | Tschernatsch | Round 7: Niermann, Tristan - Tschernatsch, Johannes | English Opening: Great Snake Variation | |
| Nov 23, 2025 | Diesenhof | 0–1 | Niermann | Round 6: Diesenhof, Michael - Niermann, Tristan | King's Indian Defense: Fianchetto Variation, Yugoslav Variation, Exchange Line | |
| Nov 23, 2025 | Niermann | 0–1 | Hassemeier | Round 5: Niermann, Tristan - Hassemeier, Mika | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Nov 23, 2025 | Niermann | ½–½ | Krause | Round 4: Niermann, Tristan - Krause, Benedict | English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation | |
| Nov 23, 2025 | Huth | 0–1 | Niermann | Round 3: Huth, Kevin - Niermann, Tristan | Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation | |
| Nov 23, 2025 | Niermann | 1–0 | Ziegenfuss | Round 2: Niermann, Tristan - Ziegenfuss, Larissa | English Opening: King's English Variation | |
| Nov 23, 2025 | Martin | 0–1 | Niermann | Round 1: Martin, Tamino Sebastian - Niermann, Tristan | Sicilian Defense: Alapin Variation, Smith-Morra Declined | |
| Nov 22, 2025 | Mimkes | 0–1 | Niermann | Round 9: Mimkes, Antal - Niermann, Tristan | Sicilian Defense: Classical Variation | |
| Nov 22, 2025 | Niermann | 1–0 | Mimkes | Round 8: Niermann, Tristan - Mimkes, Pavel | Queen's Indian Accelerated | |
| Nov 22, 2025 | Keifert | 0–1 | Niermann | Round 7: Keifert, Elijah - Niermann, Tristan | Zukertort Opening: Sicilian Invitation | |
| Nov 22, 2025 | Ruhmann | 0–1 | Niermann | Round 6: Ruhmann, Gabriel - Niermann, Tristan | English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation | |
| Nov 22, 2025 | Niermann | 0–1 | Graefe | Round 5: Niermann, Tristan - Graefe, Charly | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Nov 22, 2025 | Geldner | ½–½ | Niermann | Round 4: Geldner, Gerrit - Niermann, Tristan | English Opening: Symmetrical Variation, Ultra-Symmetrical Variation | |
| Nov 22, 2025 | Niermann | 1–0 | Arnold | Round 3: Niermann, Tristan - Arnold, Leander | Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | |
| Nov 22, 2025 | Schaefer | ½–½ | Niermann | Round 2: Schaefer, Marlon - Niermann, Tristan | Sicilian Defense: Alapin Variation | |
| Nov 22, 2025 | Niermann | 1–0 | Winterstein | Round 1: Niermann, Tristan - Winterstein, Nils | Zukertort Opening: Pirc Invitation | |
| Apr 15, 2025 | Pisk | ½–½ | Niermann | Reykjavik Open 2025 | Zukertort Opening: Sicilian Invitation | |
| Apr 14, 2025 | Niermann | 1–0 | Villiers | Reykjavik Open 2025 | Semi-Slav Defense: Normal Variation | |
| Apr 13, 2025 | Niermann | ½–½ | Allard | Reykjavik Open 2025 | English Opening: Symmetrical Variation, Botvinnik System Reversed, with Nf3 | |
| Apr 12, 2025 | Nissinen | 1–0 | Niermann | Reykjavik Open 2025 | Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation | |
| Apr 11, 2025 | Niermann | 1–0 | Harish | Reykjavik Open 2025 | English Opening: Agincourt Defense | |
| Apr 10, 2025 | Niermann | 0–1 | Petersen | Reykjavik Open 2025 | English Opening: Agincourt Defense | |
| Apr 9, 2025 | Schellenpfeil | 0–1 | Niermann | Reykjavik Open 2025 | Benoni Defense: Classical Variation, Traditional Variation | |
| Mar 31, 2024 | Titze | ½–½ | Niermann | new tournament description | Indian Defense: Budapest Defense, Rubinstein Variation | |
| Mar 30, 2024 | Niermann | 0–1 | Wong | new tournament description | Catalan Opening: Open Defense, Classical Line | |
| Mar 30, 2024 | Mishra | 1–0 | Niermann | GRENKE Chess Open | Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation, Early Deviations | |
| Mar 29, 2024 | Niermann | 1–0 | Albert | Grenke Chess Open 2024 | King's Indian Defense: Fianchetto Variation, Long Variation | |
| Jan 28, 2024 | Niermann | ½–½ | De Winter | Tata Steel Toptienkamp 2024 | King's Indian Attack: Symmetrical Defense | |
| Jan 27, 2024 | Pastar | ½–½ | Niermann | Tata Steel Toptienkamp 2024 | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jan 26, 2024 | Niermann | 1–0 | Baselmans | Tata Steel Toptienkamp 2024 | Indian Defense: London System | |
| Jan 24, 2024 | Bekker | 0–1 | Niermann | Tata Steel Toptienkamp 2024 | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Jan 23, 2024 | Abdulla | 1–0 | Niermann | Tata Steel Toptienkamp 2024 | Sicilian Defense: Kalashnikov Variation | |
| Jan 22, 2024 | Niermann | 1–0 | Van Foreest | Tata Steel Toptienkamp 2024 | Semi-Slav Defense: Stoltz Variation | |
| Jan 21, 2024 | Pijpers | 1–0 | Niermann | Tata Steel Toptienkamp 2024 | Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation | |
| Jan 20, 2024 | Niermann | 1–0 | Holzke | Tata Steel Toptienkamp 2024 | Four Knights Game: Scotch Variation Accepted | |
| Jan 19, 2024 | Zwirs | 0–1 | Niermann | Tata Steel Toptienkamp 2024 | Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation, Early Deviations | |
| Feb 6, 2022 | Tan | * | Niermann | chessemy open 2022 | English Opening: Symmetrical Variation, Hedgehog Defense | |
| Feb 5, 2022 | Niermann | 1–0 | Vypkhaniuk | chessemy open 2022 | King's Indian Defense: Fianchetto Variation, Immediate Fianchetto | |
| Feb 4, 2022 | Stotyn | 0–1 | Niermann | chessemy open 2022 | Grünfeld Defense: Russian Variation | |
| Feb 3, 2022 | Niermann | 1–0 | Germer | chessemy open 2022 | Zukertort Opening: Sicilian Invitation | |
| Feb 2, 2022 | Perkampus | ½–½ | Niermann | chessemy open 2022 | Grünfeld Defense: Exchange Variation | |
| Feb 1, 2022 | Niermann | 1–0 | Tiede | chessemy open 2022 | Indian Defense | |
| Jan 31, 2022 | Van Den Doel | 1–0 | Niermann | chessemy open 2022 | Ruy Lopez: Morphy Defense, Anderssen Variation | |
| Jan 30, 2022 | Niermann | 1–0 | Nyenhuis | chessemy open 2022 | Catalan Opening: Open Defense, Classical Line | |
| Jan 29, 2022 | Semling | 0–1 | Niermann | chessemy open 2022 | Ruy Lopez: Open, Main Line | |
