| Jun 26, 2026 | Nieminen | 0–1 | Akhmet | Round 11: Nieminen, Oliver - Akhmet, Suleyman | Sicilian Defense: Smith-Morra Gambit | |
| Jun 25, 2026 | Fadeev | ½–½ | Nieminen | Round 10: Fadeev, Justin Michael - Nieminen, Oliver | Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation | |
| Jun 24, 2026 | Nieminen | 1–0 | Peric | Round 9: Nieminen, Oliver - Peric, Toman | Queen's Gambit Declined: Normal Defense | |
| Jun 23, 2026 | Yen | 0–1 | Nieminen | Round 8: Yen, Yu-En - Nieminen, Oliver | Réti Opening: Advance Variation | |
| Jun 22, 2026 | Nieminen | 0–1 | Yu | Round 7: Nieminen, Oliver - Yu, Raphael Si-Wei | Sicilian Defense: Taimanov Variation | |
| Jun 20, 2026 | Li | 1–0 | Nieminen | Round 6: Li, Changxing - Nieminen, Oliver | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jun 19, 2026 | Nieminen | 1–0 | Vesterbaek | Round 5: Nieminen, Oliver - Vesterbaek, Noah Rath | Scotch Game: Schmidt Variation | |
| Jun 18, 2026 | Tona | 1–0 | Nieminen | Round 4: Tona, Leonardo - Nieminen, Oliver | Queen's Pawn Game: Colle System | |
| Jun 17, 2026 | Nieminen | 1–0 | Frisch | Round 3: Nieminen, Oliver - Frisch, Jan Raphael | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Jun 16, 2026 | Chung | ½–½ | Nieminen | Round 2: Chung, Frederick H. - Nieminen, Oliver | Semi-Slav Defense: Main Line | |
| Jun 15, 2026 | Nieminen | 0–1 | Lacan Rus | Round 1: Nieminen, Oliver - Lacan Rus, David | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation | |
| Feb 15, 2026 | Nieminen | 1–0 | Ral Lustig | Nordisk Mesterskab gruppe C | Alekhine Defense: Exchange Variation | |
| Feb 14, 2026 | Bernhoftsen-Banks | 1–0 | Nieminen | Nordisk Mesterskab gruppe C | Caro-Kann Defense: Exchange Variation, Rubinstein Variation | |
| Feb 14, 2026 | Bro Jacobsen | ½–½ | Nieminen | Nordisk Mesterskab gruppe C | Sicilian Defense: Moscow Variation | |
| Feb 13, 2026 | Ravikumar | 0–1 | Nieminen | Nordisk Mesterskab gruppe C | English Opening: King's English Variation | |
| Feb 12, 2026 | Nieminen | 1–0 | Christensen | Nordisk Mesterskab gruppe C | Modern Defense | |
| Feb 8, 2026 | Nieminen | 0–1 | Sandmann | Nordisk Mesterskab gruppe C | Sicilian Defense: Najdorf Variation, Adams Attack | |
| Jan 5, 2026 | Nieminen | 1–0 | Tkachov | Round 7: Nieminen, Oliver - Tkachov, Mykhailo | Ruy Lopez: Cozio Defense | |
| Jan 4, 2026 | Nieminen | 1–0 | Levanov | Round 5: Nieminen, Oliver - Levanov, Nikolay | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Jan 4, 2026 | Koskensilta | 0–1 | Nieminen | Round 4: Koskensilta, Ohto - Nieminen, Oliver | Sicilian Defense: Classical Variation | |
| Jan 3, 2026 | Nieminen | 1–0 | Paksai | Round 3: Nieminen, Oliver - Paksai, Csongor | French Defense: Advance Variation, Milner-Barry Gambit, Hector Variation | |
| Jan 3, 2026 | Nieminen | 0–1 | Heino | Round 1: Nieminen, Oliver - Heino, Joona | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Dec 14, 2025 | Vorobyov | 1–0 | Nieminen | Round 6: Vorobyov, Radmir - Nieminen, Oliver | Sicilian Defense: Sozin Attack, Main Line | |
| Jun 8, 2025 | Nieminen | 1–0 | Oksanen | Nuorten SM 2025, U14 | Sicilian Defense: Dragon Variation, Yugoslav Attack, Panov Variation | |
| Jun 7, 2025 | Donovan | ½–½ | Nieminen | Nuorten SM 2025, U14 | Queen's Gambit Declined: Harrwitz Attack, Orthodox Defense | |
| Jun 6, 2025 | Nieminen | 1–0 | Tkachov | Nuorten SM 2025, U14 | Ruy Lopez: Cozio Defense | |
| Jun 6, 2025 | Rantala | ½–½ | Nieminen | Nuorten SM 2025, U14 | Caro-Kann Defense: Maróczy Variation | |
| Jun 5, 2025 | Nieminen | 1–0 | Reunanen | Nuorten SM 2025, U14 | Petrov's Defense: Nimzowitsch Attack | |
| Jun 5, 2025 | Kesavaara | 0–1 | Nieminen | Nuorten SM 2025, U14 | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| May 7, 2025 | Nieminen | 0–1 | Vorobyov | Nuorten SM 2025, U14 | Caro-Kann Defense: Tartakower Variation | |
| Aug 20, 2024 | Nieminen | 1–0 | Margolin-Herman | EYCC 2024 Blitz O12 | Sicilian Defense: Najdorf Variation, Lipnitsky Attack | |
| Aug 20, 2024 | Nieminen | 0–1 | Beniosev | EYCC 2024 Blitz O12 | Sicilian Defense: Taimanov Variation, Bastrikov Variation | |
| Aug 20, 2024 | Nieminen | 0–1 | Toledo | EYCC 2024 Blitz O12 | Sicilian Defense: Taimanov Variation, Normal Variation | |
| Aug 20, 2024 | Margolin-Herman | 0–1 | Nieminen | EYCC 2024 Blitz O12 | Modern Defense: Standard Defense | |
| Aug 20, 2024 | Beniosev | 1–0 | Nieminen | EYCC 2024 Blitz O12 | Modern Defense | |
| Aug 20, 2024 | Toledo | 1–0 | Nieminen | EYCC 2024 Blitz O12 | Modern Defense | |
| Aug 19, 2024 | Nieminen | ½–½ | Pavlyk | EYCC 2024 Blitz O12 | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Aug 19, 2024 | Nieminen | 0–1 | Gersemann | EYCC 2024 Blitz O12 | Four Knights Game: Scotch Variation, Schmid Defense | |
| Aug 19, 2024 | Pavlyk | 1–0 | Nieminen | EYCC 2024 Blitz O12 | Pirc Defense: Classical Variation | |
| Aug 19, 2024 | Gersemann | 0–1 | Nieminen | EYCC 2024 Blitz O12 | Modern Defense: Standard Defense | |
| Aug 17, 2024 | Leenen | 1–0 | Nieminen | EYCC 2024 Rapid O12 | King's Indian Defense: Sämisch Variation, Byrne Defense | |
| — | Nieminen | 1–0 | Lilliehook | Nordic Youth Chess Championship | Sicilian Defense: Closed, Traditional | |
| — | Nieminen | ½–½ | Hallmundarson | Nordic Youth Chess Championship | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| — | Nieminen | ½–½ | Tharmarai | Nordic Youth Chess Championship | Sicilian Defense: Closed | |
| — | Sivaparan | ½–½ | Nieminen | Nordic Youth Chess Championship | Sicilian Defense: Boleslavsky Variation | |
| — | Solbu | 0–1 | Nieminen | Nordic Youth Chess Championship | Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation | |
| — | Vorobyov | ½–½ | Nieminen | Nordic Youth Chess Championship | Sicilian Defense: Snyder Variation | |
