| Jul 23, 2026 | Arndt | 1–0 | Angst | Round 10: Arndt, Uwe - Angst, Oliver | Slav Defense: Exchange Variation | |
| Jul 22, 2026 | Joly | ½–½ | Arndt | Round 9: Joly, Fabrice - Arndt, Uwe | Caro-Kann Defense: Exchange Variation | |
| Jul 21, 2026 | Arndt | ½–½ | Fogo Esquivel | Round 8: Arndt, Uwe - Fogo Esquivel, Levi Kalani Alexander | Catalan Opening: Open Defense, Classical Line | |
| Jul 20, 2026 | Rosen | 0–1 | Arndt | Round 7: Rosen, Noah - Arndt, Uwe | Caro-Kann Defense: Advance Variation, Short Variation | |
| Jul 18, 2026 | Arndt | ½–½ | Carey | Round 6: Arndt, Uwe - Carey, Michael | Benko Gambit Accepted: Fully Accepted Variation | |
| Jul 17, 2026 | Berezovskii | 1–0 | Arndt | Round 5: Berezovskii, Arina - Arndt, Uwe | Caro-Kann Defense: Exchange Variation | |
| Jul 16, 2026 | Arndt | ½–½ | Dauth | Round 4: Arndt, Uwe - Dauth, Benjamin | Queen's Pawn Game | |
| Jul 15, 2026 | Arndt | 1–0 | Magnussen | Round 3: Arndt, Uwe - Magnussen, Petur Gardar | Queen's Gambit Declined | |
| Jul 14, 2026 | Udelnov | 1–0 | Arndt | Round 2: Udelnov, Valentin - Arndt, Uwe | Caro-Kann Defense: Advance Variation, Short Variation | |
| Jul 13, 2026 | Balabayeva | 1–0 | Arndt | Round 1: Balabayeva, Xeniya - Arndt, Uwe | Semi-Slav Defense | |
| Jan 5, 2026 | Arndt | 0–1 | Bartelt | Round 9: Arndt, Uwe - Bartelt, Max Peter | Catalan Opening: Open Defense | |
| Jan 4, 2026 | Malmquist | 0–1 | Arndt | Round 8: Malmquist, Neo - Arndt, Uwe | Caro-Kann Defense: Exchange Variation | |
| Jan 2, 2026 | Arndt | 0–1 | Shuqja | Round 6: Arndt, Uwe - Shuqja, Klean | Indian Defense: Anti-Nimzo-Indian | |
| Dec 31, 2025 | Thompson | ½–½ | Arndt | Round 4: Thompson, Ian D - Arndt, Uwe | Catalan Opening: Open Defense, Classical Line | |
| Dec 31, 2025 | Arndt | ½–½ | Wahlund | Round 3: Arndt, Uwe - Wahlund, Max | Kangaroo Defense | |
| Dec 31, 2025 | Hammar | 0–1 | Arndt | Round 2: Hammar, Ulf - Arndt, Uwe | Semi-Slav Defense: Chigorin Defense | |
| Dec 31, 2025 | Arndt | 1–0 | Guba | Round 5: Arndt, Uwe - Guba, Viktor | King's Indian Defense: Semi-Averbakh System | |
| Oct 8, 2025 | Arndt | 0–1 | Hill | Round 5: Arndt, Uwe - Hill, Alistair | ? | |
| Oct 5, 2025 | Korneev Leskova | ½–½ | Arndt | Round 2: Korneev Leskova, Svyatoslav - Arndt, Uwe | English Opening: Caro-Kann Defensive System | |
| Apr 10, 2025 | Kadovic | 0–1 | Arndt | Reykjavik Open 2025 | Caro-Kann Defense: Maróczy Variation | |
| Mar 18, 2024 | Arndt | ½–½ | Cramling Bellon | Reykjavik Open 2024 | Zukertort Opening: Reversed Grünfeld | |
| Mar 31, 2023 | Arndt | * | Kusa | Reykjavik Open | ? | |