| Apr 21, 2025 | Heider | 1–0 | Wenzke | Round 8: Heider, Niklas - Wenzke, Elias | French Defense: Exchange Variation | |
| Apr 20, 2025 | Heider | 1–0 | Berkle | Round 7: Heider, Niklas - Berkle, Pascal | Caro-Kann Defense: Maróczy Variation | |
| Apr 20, 2025 | Hrisowalandis A. Milonas | 0–1 | Heider | Round 6: Hrisowalandis A. Milonas - Heider, Niklas | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation | |
| Apr 19, 2025 | Heider | 1–0 | Auwens | Round 5: Heider, Niklas - Auwens, Michel | Philidor Defense: Exchange Variation | |
| Apr 19, 2025 | Chua | 1–0 | Heider | Round 4: Chua, Ethan - Heider, Niklas | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation | |
| Apr 18, 2025 | Heider | 1–0 | Foltin | Round 3: Heider, Niklas - Foltin, Alica | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Apr 18, 2025 | Reuter | 1–0 | Heider | Round 2: Reuter, Julian-Frank - Heider, Niklas | Neo-Grünfeld Defense: Classical Variation, Original Defense | |
| Apr 17, 2025 | Heider | 1–0 | Arman Mehdi Kia | Round 1: Heider, Niklas - Arman Mehdi Kia | Sicilian Defense: Hyperaccelerated Fianchetto | |
| Apr 15, 2025 | Pijpers | 1–0 | Heider | Round 9: Pijpers, Arthur - Heider, Niklas | Sicilian Defense: Closed, Anti-Sveshnikov Variation, with d6 | |
| Dec 30, 2024 | Heider | ½–½ | Reuter | Round 7: Heider, Niklas - Reuter, Julian-Frank | Sicilian Defense: Moscow Variation | |
| Dec 30, 2024 | Rustemeyer | 0–1 | Heider | Round 6: Rustemeyer, Stephan - Heider, Niklas | Caro-Kann Defense: Panov Attack, Modern Defense | |
| Dec 29, 2024 | Heider | ½–½ | Theisen | Round 5: Heider, Niklas - Theisen, Johannes | Sicilian Defense: Moscow Variation, Main Line | |
| Dec 29, 2024 | Erkelenz | 0–1 | Heider | Round 4: Erkelenz, Fynn - Heider, Niklas | East Indian Defense | |
| Dec 28, 2024 | Heider | 0–1 | Langner | Round 3: Heider, Niklas - Langner, Jasper | French Defense: Exchange Variation | |
| Dec 28, 2024 | Verfuerth | ½–½ | Heider | Round 2: Verfuerth, Thomas - Heider, Niklas | English Opening: King's English Variation, Kramnik-Shirov Counterattack | |
| Dec 27, 2024 | Heider | 1–0 | Reimer | Round 1: Heider, Niklas - Reimer, Felix Ryu | Scotch Game: Scotch Gambit | |
