Game |
| Result | Moves |
Year | Event/Locale | Opening |
26. Lionel Adu Jr. vs J L Marckens |
| 0-1 | 61 | 2020 | FIDE Online Olympiad | A00 Uncommon Opening |
27. J L Marckens vs Saidou Nourou BA El Hadji |
| 1-0 | 37 | 2020 | FIDE Online Olympiad | B25 Sicilian, Closed |
28. M Machin Rivera vs J L Marckens |
| 1-0 | 57 | 2020 | FIDE Online Olympiad | A15 English |
29. J L Marckens vs U van Bemmelen |
| 1-0 | 17 | 2020 | FIDE Online Olympiad | B25 Sicilian, Closed |
30. J L Marckens vs S Hanoeman |
| 1-0 | 41 | 2020 | FIDE Online Olympiad | B01 Scandinavian |
31. M Alberto vs J L Marckens |
| 1-0 | 70 | 2020 | FIDE Online Olympiad | B15 Caro-Kann |
32. J L Marckens vs D Mastrovasilis |
| 0-1 | 33 | 2022 | Chennai Olympiad | B40 Sicilian |
33. Ahmad Md Siraj Munir vs J L Marckens |
| 0-1 | 58 | 2022 | Chennai Olympiad | B15 Caro-Kann |
34. J L Marckens vs K Solomon |
| 0-1 | 52 | 2022 | Chennai Olympiad | B92 Sicilian, Najdorf, Opocensky Variation |
35. Kibrom Weldegebriel Beraki vs J L Marckens |
| 1-0 | 79 | 2022 | Chennai Olympiad | D96 Grunfeld, Russian Variation |
36. Dieudonne Muheto vs J L Marckens |
| ½-½ | 80 | 2022 | Chennai Olympiad | A03 Bird's Opening |
37. J L Marckens vs M Khusenkhojaev |
| 0-1 | 47 | 2022 | Chennai Olympiad | C53 Giuoco Piano |
38. J L Marckens vs Kokou Difendramakada Jacques Balle |
| 1-0 | 48 | 2022 | Chennai Olympiad | B09 Pirc, Austrian Attack |
39. I Msellek vs J L Marckens |
| 1-0 | 24 | 2022 | Chennai Olympiad | B12 Caro-Kann Defense |
40. J L Marckens vs Taffin Khan |
| ½-½ | 40 | 2022 | Chennai Olympiad | B20 Sicilian |