| Jul 31, 2025 | Heimann | 0–1 | Stefanou | Round 5: Heimann, Alexander - Stefanou, Dimitrios | Rat Defense: English Rat | |
| Jun 14, 2025 | Heimann | ½–½ | Ye | ODJM A 2025 | Slav Defense | |
| Jun 13, 2025 | Krause | 1–0 | Heimann | ODJM A 2025 | English Opening: Caro-Kann Defensive System | |
| Jun 12, 2025 | Tulchynsky | ½–½ | Heimann | ODJM A 2025 | Sicilian Defense: French Variation | |
| Jun 11, 2025 | Heimann | 0–1 | Hoffmann | ODJM A 2025 | Zukertort Opening | |
| Jun 11, 2025 | Heimann | 1–0 | Hierl | ODJM A 2025 | Queen's Pawn Game: Colle System | |
| Jun 10, 2025 | Mimkes | 1–0 | Heimann | ODJM A 2025 | Sicilian Defense: Wing Gambit, Carlsbad Variation | |
| Jun 9, 2025 | Heimann | ½–½ | Ronsin | ODJM A 2025 | Catalan Opening: Closed Variation, Traditional Variation | |
| Jun 8, 2025 | Seifert | 0–1 | Heimann | ODJM A 2025 | Sicilian Defense | |
| Jun 8, 2025 | Heimann | ½–½ | Fellberg | ODJM A 2025 | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| May 25, 2024 | Geist | 1–0 | Heimann | ODJM A 2024 | Sicilian Defense: Kan Variation, Maróczy Bind, Réti Variation | |
| May 24, 2024 | Heimann | 1–0 | Stiehler | ODJM A 2024 | King's Indian Defense: Fianchetto Variation, Larsen Defense | |
| May 23, 2024 | Moerke | ½–½ | Heimann | ODJM A 2024 | Queen's Gambit Declined: Three Knights Variation | |
| May 22, 2024 | Heimann | ½–½ | Wendt | ODJM A 2024 | Queen's Gambit Declined: Modern Variation | |
| May 22, 2024 | Mainka | ½–½ | Heimann | ODJM A 2024 | Sicilian Defense: Scheveningen Variation | |
| May 21, 2024 | Heimann | ½–½ | Andrade | ODJM A 2024 | Zukertort Opening | |
| May 20, 2024 | Hofmann | ½–½ | Heimann | ODJM A 2024 | Indian Defense: Knights Variation | |
| May 12, 2024 | Heimann | 1–0 | Bye 2 | Round 5: Heimann, Alexander - Bye 2 | ? | |
| May 12, 2024 | Heimann | 1–0 | Xia | Round 4: Heimann, Alexander - Xia, Joshua | Sicilian Defense: Najdorf Variation | |
| May 12, 2024 | Bye 2 | 0–1 | Heimann | Round 3: Bye 2 - Heimann, Alexander | ? | |
| May 11, 2024 | Heimann | ½–½ | Yao | Round 2: Heimann, Alexander - Yao, Hanchi | Réti Opening: Reversed Blumenfeld Gambit | |
| May 11, 2024 | Talwalkar | ½–½ | Heimann | Round 1: Talwalkar, Vedant - Heimann, Alexander | Alekhine Defense: Modern Variation, Larsen Variation | |
| Apr 21, 2024 | Rajaram | ½–½ | Heimann | Round 5: Rajaram, Rohan - Heimann, Alexander | Queen's Indian Defense: Classical Variation, Traditional Variation | |
| Apr 21, 2024 | Heimann | 1–0 | Guo | Round 4: Heimann, Alexander - Guo, Ethan | Réti Opening: Advance Variation | |
| Mar 10, 2024 | Heimann | ½–½ | Abhinav Penagalapati | Round 5: Heimann, Alexander - Abhinav Penagalapati | Sicilian Defense: Richter-Rauzer Variation, Ivanov Variation | |
| Mar 10, 2024 | Champsi | ½–½ | Heimann | Round 4: Champsi, Imran - Heimann, Alexander | Nimzo-Indian Defense: Classical Variation | |
| Mar 10, 2024 | Heimann | ½–½ | Liu | Round 3: Heimann, Alexander - Liu, Patrick | Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack | |
| Mar 9, 2024 | Suarez | ½–½ | Heimann | Round 2: Suarez, Sebastian - Heimann, Alexander | Sicilian Defense: Scheveningen Variation, English Attack, with f3 | |
| Mar 9, 2024 | Chinni | 1–0 | Heimann | Round 1: Chinni, Rishabh - Heimann, Alexander | Sicilian Defense: Open | |
| Oct 6, 2024 | Heimann | ½–½ | Amburgy | Round 5: Heimann, Alexander - Amburgy, Ryan | Ruy Lopez: Morphy Defense, Arkhangelsk Variation | |
| Oct 6, 2024 | Widjaja | 0–1 | Heimann | Round 4: Widjaja, Luke - Heimann, Alexander | Sicilian Defense: French Variation | |
| Oct 5, 2024 | Heimann | 1–0 | Bhatta | Round 2: Heimann, Alexander - Bhatta, Rohit | Ruy Lopez: Berlin Defense | |
| Oct 5, 2024 | Heimann | 1–0 | Yan | Round 3: Heimann, Alexander - Yan, Nathan | King's Pawn Game | |
| Oct 4, 2024 | Zhou | ½–½ | Heimann | Round 1: Zhou, Ruoyu - Heimann, Alexander | French Defense: Exchange Variation | |
| Aug 4, 2024 | Ganesan | 0–1 | Heimann | Round 5: Ganesan, Vikrant - Heimann, Alexander | ? | |
| Aug 3, 2024 | Heimann | 1–0 | Zhou | Round 4: Heimann, Alexander - Zhou, Ruoyu | ? | |
| Aug 3, 2024 | Jin | 0–1 | Heimann | Round 3: Jin, Austin - Heimann, Alexander | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Aug 2, 2024 | Heimann | ½–½ | Bhatta | Round 1: Heimann, Alexander - Bhatta, Rohit | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Aug 2, 2024 | Yang | 0–1 | Heimann | Round 2: Yang, Maxwell - Heimann, Alexander | Queen's Gambit Declined: Three Knights, Vienna Variation | |
