| 18 jul 2026 | Panda, Barnabas 2187 | Niemi, Kalle 2301 | 1-0 | E71 Defensa India de Rey: Karpov System | XXXIV Heart of Finland Open | 49 | Ver |
| 17 jul 2026 | Niemi, Kalle 2301 | Zhang, Yiming 2167 | ½-½ | B90 Defensa Siciliana: Najdorf Variation, Yates Variation | XXXIV Heart of Finland Open | 42 | Ver |
| 16 jul 2026 | Niemi, Kalle 2301 | Tumanov, Dmitri 2138 | 1-0 | C02 Defensa Francesa: Advance Variation, Milner-Barry Gambit | XXXIV Heart of Finland Open | 43 | Ver |
| 16 jul 2026 | Harikrishnan.A.Ra 2519 | Niemi, Kalle 2301 | 1-0 | A05 Ataque Indio de Rey: Symmetrical Defense | XXXIV Heart of Finland Open | 59 | Ver |
| 15 jul 2026 | Elgar, Tim 2166 | Niemi, Kalle 2301 | 0-1 | A05 Ataque Indio de Rey: Symmetrical Defense | XXXIV Heart of Finland Open | 47 | Ver |
| 14 jul 2026 | Niemi, Kalle 2301 | Korneev, Oleg 2433 | 0-1 | B56 Defensa Siciliana: Classical Variation | XXXIV Heart of Finland Open | 38 | Ver |
| 14 jul 2026 | Vorobyov, Radmir 2169 | Niemi, Kalle 2301 | 0-1 | C48 Apertura de los Cuatro Caballos: Spanish Variation | XXXIV Heart of Finland Open | 42 | Ver |
| 14 jul 2026 | Niemi, Kalle 2301 | Salmelin, Aaro 2106 | 1-0 | C79 Apertura Española (Ruy López): Morphy Defense, Steinitz Deferred | XXXIV Heart of Finland Open | 71 | Ver |