| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. S Avila Pavas vs A Mateus |
| 1-0 | 27 | 2022 | Guillermo Garcia Elite | B50 Sicilian |
| 27. A S Dalvi vs A Mateus |
| 1-0 | 49 | 2023 | Serbia Open Masters | D44 Queen's Gambit Declined Semi-Slav |
| 28. A Mateus vs A Granovskiy |
| ½-½ | 51 | 2023 | Serbia Open Masters | C71 Ruy Lopez |
| 29. A Gkavardinas vs A Mateus |
| 1-0 | 56 | 2023 | Serbia Open Masters | B90 Sicilian, Najdorf |
| 30. A Mateus vs D Loshkarev |
| 1-0 | 25 | 2023 | Serbia Open Masters | D20 Queen's Gambit Accepted |
| 31. I Southcott-Moyers vs A Mateus |
| ½-½ | 48 | 2023 | Serbia Open Masters | D02 Queen's Pawn Game |
| 32. A Mateus vs A Grozdanovic |
| 1-0 | 22 | 2023 | Serbia Open Masters | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 33. M Djokic vs A Mateus |
| 0-1 | 46 | 2023 | Serbia Open Masters | B92 Sicilian, Najdorf, Opocensky Variation |
| 34. A Mateus vs S Pogorelskikh |
| 1-0 | 33 | 2023 | Serbia Open Masters | C95 Ruy Lopez, Closed, Breyer |
| 35. A Kim vs A Mateus |
| 1-0 | 48 | 2023 | Serbia Open Masters | D45 Queen's Gambit Declined Semi-Slav |
| 36. A Mateus vs S Avila Pavas |
| 0-1 | 34 | 2023 | Spilimbergo Open | B04 Alekhine's Defense, Modern |
| 37. F Colonetti vs A Mateus |
| 0-1 | 33 | 2023 | Spilimbergo Open | D30 Queen's Gambit Declined |
| 38. J B Gomez Barrera vs A Mateus |
| ½-½ | 80 | 2023 | Spilimbergo Open | B90 Sicilian, Najdorf |
| 39. T Razafindratsima vs A Mateus |
| 1-0 | 39 | 2023 | Spilimbergo Open | B57 Sicilian |
| 40. A Mateus vs M Pegno |
| 1-0 | 46 | 2023 | Spilimbergo Open | E04 Catalan, Open, 5.Nf3 |
| 41. A Mateus vs M Mueller |
| ½-½ | 37 | 2023 | Spilimbergo Open | B45 Sicilian, Taimanov |
| 42. L Stoettner vs A Mateus |
| 1-0 | 37 | 2023 | Spilimbergo Open | A06 Reti Opening |
| 43. A Mateus vs G Sala |
| 1-0 | 40 | 2023 | Spilimbergo Open | B22 Sicilian, Alapin |
Kibitzing
