| Apr 4, 2026 | Lammers | ½–½ | Baenziger | Grenke Chess Festival 2026 Open | English Opening: Anglo-Indian Defense, King's Knight Variation | |
| Apr 4, 2026 | Harshavardhan G B | ½–½ | Lammers | Grenke Chess Festival 2026 Open | Petrov's Defense | |
| Dec 30, 2025 | Lammers | 0–1 | Zude | Round 7: Lammers, Markus - Zude, Arno | Queen's Gambit Declined: Three Knights Variation | |
| Dec 29, 2025 | Lammers | ½–½ | Ziegenfuss | Round 6: Lammers, Markus - Ziegenfuss, Antonia | English Opening: Symmetrical Variation, Rubinstein Variation | |
| Dec 29, 2025 | Pahl | 0–1 | Lammers | Round 5: Pahl, Erik - Lammers, Markus | Petrov's Defense: Modern Attack, Center Variation | |
| Dec 28, 2025 | Lammers | 1–0 | Hundack | Round 4: Lammers, Markus - Hundack, Rolf | Queen's Pawn Game: Symmetrical Variation | |
| Dec 28, 2025 | Pahl | 1–0 | Lammers | Round 3: Pahl, Theis - Lammers, Markus | King's Pawn Game: Alapin Opening | |
| Dec 27, 2025 | Lammers | 1–0 | Rudolph | Round 2: Lammers, Markus - Rudolph, Peter | English Opening: Anglo-Indian Defense, King's Knight Variation | |
| Dec 27, 2025 | Thomas | 0–1 | Lammers | Round 1: Thomas, Jeremy - Lammers, Markus | Philidor Defense: Lion Variation | |
| Apr 21, 2025 | Szakmary | 1–0 | Lammers | Freestyle Chess Open A | ? | |
| Apr 19, 2025 | Lammers | 0–1 | Vogel | Freestyle Chess Open A | ? | |
| Apr 18, 2025 | Kollars | 1–0 | Lammers | Round 2: Kollars, Dmitrij - Lammers, Markus | ? | |
| Jan 5, 2025 | Abel | 0–1 | Lammers | Round 7: Abel, Dennes - Lammers, Markus | Zukertort Opening | |
| Jan 4, 2025 | Lammers | 1–0 | Peters | Round 5: Lammers, Markus - Peters, Tom | Indian Defense: Anti-Nimzo-Indian | |
| Jan 4, 2025 | Lammers | 1–0 | Stelmaszyk | Round 6: Lammers, Markus - Stelmaszyk, Nico | Queen's Gambit Accepted: Furman Variation | |
| Jan 3, 2025 | Hampel | 1–0 | Lammers | Round 3: Hampel, Felix - Lammers, Markus | English Opening: Symmetrical Variation, Three Knights Variation | |
| Jan 3, 2025 | ter Stal | 0–1 | Lammers | Round 4: ter Stal, Lars - Lammers, Markus | Nimzowitsch Defense: Colorado Countergambit Accepted | |
| Jan 2, 2025 | Lammers | 0–1 | Bruns | Round 2: Lammers, Markus - Bruns, Kai-Christian | Slav Defense: Quiet Variation | |
| Jan 2, 2025 | Celik | 0–1 | Lammers | Round 1: Celik, Abdullah - Lammers, Markus | Catalan Opening | |
| Oct 24, 2024 | Lammers | ½–½ | Bruch | 39th European Chess Club Cup | King's Indian Defense: Fianchetto Variation, Yugoslav Variation | |
| Oct 23, 2024 | Lammers | 1–0 | Birkisson | 39th European Chess Club Cup | Slav Defense: Quiet Variation, Schallopp Defense | |
| Oct 21, 2024 | Ilinca | 1–0 | Lammers | 39th European Chess Club Cup | Petrov's Defense: Modern Attack, Center Variation | |
| Oct 20, 2024 | Lammers | 1–0 | Hartio | 39th European Chess Club Cup | Indian Defense: Anti-Nimzo-Indian | |
| Apr 28, 2024 | Lammers | 0–1 | Ivanchuk | Bundesliga 2023/2024 | Pirc Defense: Classical Variation | |
| Apr 27, 2024 | Lammers | 1–0 | Kraemer | Bundesliga 2023/2024 | Queen's Pawn Game: Symmetrical Variation | |
| Feb 25, 2024 | Kempinski | 1–0 | Lammers | Schachbundesliga 23/24 | Benoni Defense | |
| Feb 24, 2024 | Lammers | ½–½ | Teclaf | Schachbundesliga 23/24 | Yusupov-Rubinstein System | |
| Feb 23, 2024 | Vogel | 1–0 | Lammers | Schachbundesliga 23/24 | Queen's Gambit Accepted: Central Variation, McDonnell Defense | |
| Feb 4, 2024 | Lammers | 0–1 | Shirov | Dt. Schachbundesliga 2023/2024 | Slav Defense: Exchange Variation | |
| Feb 3, 2024 | Lagarde | 1–0 | Lammers | Dt. Schachbundesliga 2023/2024 | King's Indian Attack | |
| Nov 3, 2024 | Lammers | 0–1 | Vandenhole | Round 7: Lammers, Markus - Vandenhole, Kobe | English Opening: Agincourt Defense | |
| Nov 2, 2024 | Lammers | 0–1 | Lippert | Round 5: Lammers, Markus - Lippert, Daniel | Slav Defense: Quiet Variation | |
| Nov 2, 2024 | Kutlar | 0–1 | Lammers | Round 6: Kutlar, Aras - Lammers, Markus | Nimzowitsch Defense: Scandinavian Variation, Advance Variation | |
| Nov 1, 2024 | Lammers | ½–½ | Hulshof | Round 3: Lammers, Markus - Hulshof, Peter | Slav Defense: Quiet Variation, Schallopp Defense | |
| Nov 1, 2024 | Skembris | 0–1 | Lammers | Round 4: Skembris, Simon Max - Lammers, Markus | Nimzowitsch Defense: Colorado Countergambit Accepted | |
| Oct 31, 2024 | Lammers | 1–0 | Kort | Round 1: Lammers, Markus - Kort, Felix | Yusupov-Rubinstein System | |
| Oct 31, 2024 | Sommer | ½–½ | Lammers | Round 2: Sommer, Justus - Lammers, Markus | Scandinavian Defense: Marshall Variation | |
| Dec 3, 2023 | Alonso Rosell | 1–0 | Lammers | SBL | Petrov's Defense | |
| Dec 2, 2023 | Lammers | 1–0 | Hertneck | Schachbundesliga | Réti Opening: Advance Variation | |
| Oct 28, 2023 | Lammers | 1–0 | Kolthoff | 26. Offene Internationale Bayerische Schachmeisterschaft Tegernsee | Slav Defense: Quiet Variation, Schallopp Defense | |
| Oct 22, 2023 | Jovanovic | 1–0 | Lammers | Deutsche Bundesliga 2023/2024 | Petrov's Defense: Millennium Attack | |
| Oct 21, 2023 | Lammers | 0–1 | Van Foreest | Deutsche Bundesliga 2023/2024 | Réti Opening: Advance Variation | |