| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. J Nieva vs S Mareco |
| 1-0 | 38 | 2008 | Liga Nacional Ajedrez | E21 Nimzo-Indian, Three Knights |
| 2. D Stamenkovic vs S Mareco |
| 0-1 | 36 | 2011 | Antonio Rocha Memorial | E21 Nimzo-Indian, Three Knights |
| 3. L Coelho vs S Mareco |
| 0-1 | 60 | 2011 | Mario Covas Memorial | E21 Nimzo-Indian, Three Knights |
| 4. Vitiugov vs S Mareco |
| 1-0 | 61 | 2015 | Gibraltar Masters | E21 Nimzo-Indian, Three Knights |
| 5. V Petkov vs S Mareco |
| ½-½ | 52 | 2015 | 31st Cappelle Open | E21 Nimzo-Indian, Three Knights |
| 6. E Real de Azua vs S Mareco |
| 0-1 | 35 | 2015 | Argentine Championship | E21 Nimzo-Indian, Three Knights |
| 7. F Valenzuela Gomez vs S Mareco |
| 0-1 | 34 | 2016 | 11th American Continental | E21 Nimzo-Indian, Three Knights |
| 8. A Hoffman vs S Mareco |
| 1-0 | 78 | 2017 | Jorge Szmetan Mem | E21 Nimzo-Indian, Three Knights |
Kibitzing
