| Mar 2, 2026 | Heimann | ½–½ | Putnam | American Cup Blitz | Queen's Gambit Declined: Traditional Variation | |
| Mar 2, 2026 | Akobian | 1–0 | Heimann | American Cup Blitz | Wade Defense | |
| Mar 2, 2026 | Heimann | 1–0 | Atwell | American Cup Blitz | French Defense: Classical Variation, Burn Variation, Morozevich Line | |
| Mar 2, 2026 | Wang | ½–½ | Heimann | American Cup Blitz | Zukertort Opening: Black Mustang Defense | |
| Mar 2, 2026 | Heimann | 1–0 | Sukandar | American Cup Blitz | Queen's Gambit Declined: Harrwitz Attack, Fianchetto Defense | |
| Mar 2, 2026 | Bilych | 1–0 | Heimann | American Cup Blitz | Four Knights Game: Spanish Variation, Symmetrical Variation | |
| Mar 2, 2026 | Heimann | 1–0 | Boros | American Cup Blitz | Nimzowitsch Defense: Kennedy Variation, Linksspringer Variation | |
| Mar 2, 2026 | Kiolbasa | 1–0 | Heimann | American Cup Blitz | Four Knights Game | |
| Mar 1, 2026 | Heimann | ½–½ | Wang | Saint Louis Masters | French Defense: St. George Defense | |
| Feb 28, 2026 | Heimann | 0–1 | Narayanan | Saint Louis Masters | Scotch Game: Schmidt Variation | |
| Feb 28, 2026 | Atwell | ½–½ | Heimann | Saint Louis Masters | Bogo-Indian Defense: Retreat Variation | |
| Feb 27, 2026 | Heimann | ½–½ | Antova | Saint Louis Masters | Bogo-Indian Defense: Vitolins Variation | |
| Feb 27, 2026 | Caglar | 0–1 | Heimann | Saint Louis Masters | Caro-Kann Defense: Endgame Offer | |
| Feb 26, 2026 | Heimann | 0–1 | Gueci | Saint Louis Masters | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Feb 26, 2026 | Kavutskiy | 0–1 | Heimann | Saint Louis Masters | King's Indian Attack, with e6 | |
| Feb 25, 2026 | Heimann | 0–1 | Rosen | Saint Louis Masters | Sicilian Defense: Taimanov Variation, Bastrikov Variation | |
| Feb 25, 2026 | Apaar Saxena | 1–0 | Heimann | Saint Louis Masters | Queen's Gambit Declined | |
| Feb 23, 2026 | Heimann | 0–1 | Caruana | American Cup Blitz | Caro-Kann Defense: Endgame Offer | |
| Jan 4, 2026 | Rajaram | 0–1 | Heimann | Round 5: Rajaram, Rohan - Heimann, Mark | Catalan Opening | |
| Jan 4, 2026 | Heimann | 1–0 | Mahajan | Round 3: Heimann, Mark - Mahajan, Rushaan | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Jan 3, 2026 | Virtanen | ½–½ | Heimann | Round 2: Virtanen, Teemu - Heimann, Mark | English Opening: Anglo-Indian Defense | |
| Jan 3, 2026 | Heimann | 1–0 | Nanugonda | Round 1: Heimann, Mark - Nanugonda, Vishva | King's Indian Attack | |
| Jan 1, 2026 | Aleksey Sorokin | 1–0 | Heimann | Round 4: Aleksey Sorokin - Heimann, Mark | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Jul 31, 2025 | Heimann | 1–0 | Jacobson | Round 5: Heimann, Mark - Jacobson, Aaron | French Defense: Classical Variation, Burn Variation | |
| Jul 30, 2025 | Cao | ½–½ | Heimann | Round 4: Cao, Qingfeng - Heimann, Mark | Catalan Opening: Open Defense | |
| Jul 29, 2025 | Heimann | 1–0 | Rosh Jain | Round 3: Heimann, Mark - Rosh Jain | Pirc Defense: Classical Variation | |
| Jul 29, 2025 | Ketzetzis | 0–1 | Heimann | Round 2: Ketzetzis, Georgios - Heimann, Mark | Caro-Kann Defense: Maróczy Variation | |
| Jul 28, 2025 | Heimann | 1–0 | Liashkevich | Round 1: Heimann, Mark - Liashkevich, Lizaveta | Zukertort Opening | |
| Aug 10, 2024 | Heimann | 1–0 | Paragua | 11th Annual Washington International - Championship | Sicilian Defense: French Variation, Westerinen Attack | |
| Aug 10, 2024 | Heimann | 1–0 | Zeltsan | 11th Annual Washington International - Championship | Sicilian Defense: French Variation, Normal | |
| Aug 10, 2024 | Gutla | 0–1 | Heimann | 11th Annual Washington International - Championship | Bogo-Indian Defense: Retreat Variation | |
| Jun 28, 2024 | Heimann | 1–0 | Suarez | Round 1: Heimann, Mark - Suarez, Sebastian | Sicilian Defense: Kan Variation, Modern Variation | |
| Jun 28, 2024 | Heimann | 1–0 | Yang | Round 3: Heimann, Mark - Yang, Vian | King's Pawn Game | |
| Jun 28, 2024 | Heimann | 1–0 | Ganesan | Round 5: Heimann, Mark - Ganesan, Vikrant | Sicilian Defense: Moscow Variation, Main Line | |
| Jun 28, 2024 | Rajaram | 0–1 | Heimann | Round 2: Rajaram, Rohan - Heimann, Mark | Indian Defense: Dzindzi-Indian Defense | |
| Jun 28, 2024 | Yan | 0–1 | Heimann | Round 4: Yan, Nathan - Heimann, Mark | French Defense: Tarrasch Variation, Open System, Euwe-Keres Line | |
| May 27, 2024 | Heimann | ½–½ | Rahul Srivatshav P | Round 9: Heimann, Mark - Rahul Srivatshav P | Sicilian Defense: Four Knights Variation | |
| May 27, 2024 | Plat | ½–½ | Heimann | Round 8: Plat, Vojtech - Heimann, Mark | Caro-Kann Defense: Exchange Variation, Rubinstein Variation | |
| May 26, 2024 | Bick | 0–1 | Heimann | Round 7: Bick, Gabriel James Koop - Heimann, Mark | Italian Game: Classical Variation, Greco Gambit | |
| May 26, 2024 | Heimann | 0–1 | Stearman | Round 6: Heimann, Mark - Stearman, Josiah | Nimzo-Indian Defense: Normal Variation, Ragozin Variation | |
| May 25, 2024 | Heimann | ½–½ | Sheng | Round 5: Heimann, Mark - Sheng, Joshua | Zukertort Opening | |
| May 25, 2024 | Georgiev | 0–1 | Heimann | Round 4: Georgiev, Vladimir - Heimann, Mark | Queen's Gambit Declined: Modern Variation | |
| May 24, 2024 | Heimann | 1–0 | Sivakumar | Round 3: Heimann, Mark - Sivakumar, Shaashwath | Sicilian Defense: Najdorf Variation, Adams Attack | |
| May 24, 2024 | Chinni | 0–1 | Heimann | Round 2: Chinni, Rishabh - Heimann, Mark | Ruy Lopez: Morphy Defense, Norwegian Variation | |
| May 24, 2024 | Heimann | ½–½ | Arutla | Round 1: Heimann, Mark - Arutla, Aditya | Nimzo-Indian Defense: Normal Variation | |
| May 12, 2024 | Heimann | 1–0 | Tang | Round 5: Heimann, Mark - Tang, Dylan | Ruy Lopez: Morphy Defense | |
| May 12, 2024 | Iinuma | 0–1 | Heimann | Round 4: Iinuma, Paul Y - Heimann, Mark | Nimzo-Indian Defense: Classical Variation, Noa Variation | |
| May 12, 2024 | Heimann | ½–½ | Atwell | Round 3: Heimann, Mark - Atwell, Rose | Zukertort Opening | |
| May 11, 2024 | Suarez | 0–1 | Heimann | Round 2: Suarez, Sebastian - Heimann, Mark | Ruy Lopez: Morphy Defense, Modern Steinitz Defense, Siesta Variation | |
| May 11, 2024 | Heimann | 1–0 | Yan | Round 1: Heimann, Mark - Yan, Nathan | Ruy Lopez: Exchange Variation, Gligoric Variation | |
| Apr 21, 2024 | Sivakumar | 0–1 | Heimann | Round 5: Sivakumar, Shaaketh - Heimann, Mark | Queen's Pawn Game: London System | |
| Apr 21, 2024 | Heimann | ½–½ | Atwell | Round 4: Heimann, Mark - Atwell, Rose | Petrov's Defense: Classical Attack, Marshall Variation | |
| Apr 3, 2024 | Pichot | 1–0 | Heimann | Menorca Open 2024 | Italian Game: Giuoco Pianissimo, Normal | |
| Apr 1, 2024 | Xiao | ½–½ | Heimann | Round 9: Xiao, Tong(QD) - Heimann, Mark | Ruy Lopez: Berlin Defense | |
| Mar 31, 2024 | Heimann | 1–0 | Lazaro Pujol | Round 8: Heimann, Mark - Lazaro Pujol, Abel | Queen's Gambit Declined: Ragozin Defense | |
| Mar 31, 2024 | Alekseenko | 1–0 | Heimann | Round 7: Alekseenko, Kirill - Heimann, Mark | Ruy Lopez: Morphy Defense, Cozio Defense | |
| Mar 30, 2024 | Heimann | 1–0 | Makhnev | Round 6: Heimann, Mark - Makhnev, Denis | Semi-Slav Defense: Normal Variation | |
| Mar 29, 2024 | Heimann | 1–0 | Basso | Round 5: Heimann, Mark - Basso, Pier Luigi | Ruy Lopez: Open | |
| Mar 29, 2024 | Ivanchuk | ½–½ | Heimann | Round 4: Ivanchuk, Vasyl - Heimann, Mark | Caro-Kann Defense: Tartakower Variation | |
| Mar 10, 2024 | Heimann | 1–0 | Atwell | Round 5: Heimann, Mark - Atwell, Rose | Slav Defense: Quiet Variation, Schallopp Defense | |
| Mar 10, 2024 | Guo | ½–½ | Heimann | Round 4: Guo, Ethan - Heimann, Mark | Caro-Kann Defense: Two Knights Attack | |
| Mar 10, 2024 | Yan | 0–1 | Heimann | Round 3: Yan, Nathan - Heimann, Mark | Caro-Kann Defense: Two Knights Attack | |
| Mar 9, 2024 | Heimann | 1–0 | Oberoi | Round 2: Heimann, Mark - Oberoi, Shelev | ? | |
| Mar 9, 2024 | Arutla | * | Heimann | Round 1: Arutla, Aditya - Heimann, Mark | Slav Defense: Modern Line | |
| Dec 30, 2024 | Liu | ½–½ | Heimann | Round 9: Liu, Yan - Heimann, Mark | English Opening: King's English Variation, Kramnik-Shirov Counterattack | |
| Dec 29, 2024 | Heimann | 1–0 | Prabhu | 34th Annual North American Open | English Opening: King's English Variation | |
| Dec 29, 2024 | Heimann | ½–½ | Zhou | Round 8: Heimann, Mark - Zhou, Jianchao | Sicilian Defense: Najdorf Variation | |
| Dec 28, 2024 | Heimann | 1–0 | Amburgy | 34th Annual North American Open | Ruy Lopez: Morphy Defense, Arkhangelsk Variation | |
| Dec 28, 2024 | Burke | 1–0 | Heimann | Round 6: Burke, John M - Heimann, Mark | Ruy Lopez: Berlin Defense, Rio Gambit Accepted | |
| Dec 27, 2024 | Heimann | ½–½ | Tang | Round 3: Heimann, Mark - Tang, Zoey | Sicilian Defense: Classical Variation, Sozin Attack | |
| Dec 27, 2024 | Yim | 0–1 | Heimann | 34th Annual North American Open | Nimzo-Indian Defense: Classical Variation, Noa Variation | |
| Dec 27, 2024 | Park | ½–½ | Heimann | Round 4: Park, Evan - Heimann, Mark | Ruy Lopez: Closed, Flohr System | |
| Oct 6, 2024 | Heimann | 1–0 | Wongso | Round 4: Heimann, Mark - Wongso, Steve | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Oct 6, 2024 | Heimann | ½–½ | Arutla | Round 5: Heimann, Mark - Arutla, Aditya | English Opening: Caro-Kann Defensive System | |
| Oct 5, 2024 | Heimann | ½–½ | Guo | Round 2: Heimann, Mark - Guo, Ethan | English Opening: Anglo-Indian Defense, Anti-Anti-Grünfeld | |
| Oct 5, 2024 | Rajaram | 0–1 | Heimann | Round 3: Rajaram, Rohan - Heimann, Mark | Indian Defense: Dzindzi-Indian Defense | |
| Oct 4, 2024 | Atwell | 0–1 | Heimann | Round 1: Atwell, Rose - Heimann, Mark | Sicilian Defense: Delayed Alapin Variation, with e6 | |
| Aug 30, 2024 | Webb | 1–0 | Heimann | Round 8: Webb, Laurence E - Heimann, Mark | Indian Defense: Anti-Nimzo-Indian | |
| Aug 28, 2024 | Valle Luis | 1–0 | Heimann | Round 6: Valle Luis, Leo - Heimann, Mark | French Defense: Advance Variation, Euwe Variation | |
| Aug 27, 2024 | Heimann | 0–1 | Piorun | Round 5: Heimann, Mark - Piorun, Kacper | French Defense: Winawer Variation, Delayed Exchange Variation | |
| Aug 26, 2024 | Heimann | 1–0 | Serrano Batova | Round 4: Heimann, Mark - Serrano Batova, Vicent | King's Indian Defense: Semi-Averbakh System | |
| Aug 25, 2024 | Argiroudis | 0–1 | Heimann | Round 3: Argiroudis, Stamatis - Heimann, Mark | Catalan Opening: Open Defense | |
| Aug 24, 2024 | Heimann | 1–0 | Gomez Navais | Round 2: Heimann, Mark - Gomez Navais, Marcal | King's Indian Defense: Normal Variation, Rare Defenses | |
| Aug 13, 2024 | Grigoryan | 1–0 | Heimann | Round 7: Grigoryan, Karen H. - Heimann, Mark | King's Indian Attack | |
| Aug 12, 2024 | Zhou | ½–½ | Heimann | Round 5: Zhou, Jianchao - Heimann, Mark | English Opening: Agincourt Defense | |
| Aug 11, 2024 | Heimann | 0–1 | Burke | Round 3: Heimann, Mark - Burke, John M | Italian Game: Classical Variation, Giuoco Pianissimo, with d6 | |
| — | Heimann | ½–½ | Drozdowski | Round 7: Heimann, Mark - Drozdowski, Kacper | Queen's Gambit Declined: Queen's Knight Variation | |
| — | Aaryan Varshney | ½–½ | Heimann | Round 6: Aaryan Varshney - Heimann, Mark | Queen's Gambit Declined: Barmen Variation | |
| — | Durak | 1–0 | Heimann | Round 8: Durak, Can - Heimann, Mark | King's Pawn Game | |
| — | Avsar | ½–½ | Heimann | Round 9: Avsar, Gediz - Heimann, Mark | Ruy Lopez: Morphy Defense, Classical Defense Deferred | |