| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. P Christen vs F Costa |
| 0-1 | 22 | 1988 | Brocco Open | D02 Queen's Pawn Game |
| 2. F Costa vs A Antunes |
| 1-0 | 81 | 1994 | POR-chT | B22 Sicilian, Alapin |
| 3. K Spraggett vs F Costa |
| 1-0 | 26 | 1996 | Loures (Portugal) | B23 Sicilian, Closed |
| 4. M Narciso Dublan vs F Costa |
| 1-0 | 49 | 1996 | Olot op | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 5. Larsen vs F Costa |
| 0-1 | 29 | 1996 | Mondariz op | A07 King's Indian Attack |
| 6. D Barua vs F Costa |
| 1-0 | 32 | 1996 | Ubeda Open | B85 Sicilian, Scheveningen, Classical |
| 7. F Costa vs D Fernando |
| ½-½ | 40 | 1997 | Loures2 | A21 English |
| 8. F Costa vs Westerinen |
| 0-1 | 21 | 1997 | Benasque Open | B02 Alekhine's Defense |
| 9. M Al-Modiahki vs F Costa |
| 1-0 | 37 | 1997 | Benasque Open | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 10. V Gallego Jimenez vs F Costa |
| 1-0 | 42 | 1997 | Benasque Open | A48 King's Indian |
| 11. F Costa vs D Fernando |
| 0-1 | 29 | 1998 | POR-ch | B07 Pirc |
| 12. D Fernando vs F Costa |
| 1-0 | 60 | 1998 | POR-ch sf | B86 Sicilian, Fischer-Sozin Attack |
| 13. A Peixoto vs F Costa |
| 0-1 | 16 | 1998 | Young Masters | C36 King's Gambit Accepted, Abbazia Defense |
| 14. D Fernando vs F Costa |
| 0-1 | 45 | 1999 | Lisbon-ch | B87 Sicilian, Fischer-Sozin with ...a6 and ...b5 |
| 15. F Costa vs D Fernando |
| 0-1 | 59 | 1999 | POR-ch | C58 Two Knights |
| 16. F Costa vs H Stefansson |
| 0-1 | 38 | 1999 | Las Palmas Open | B21 Sicilian, 2.f4 and 2.d4 |
| 17. A Villavicencio vs F Costa |
| 1-0 | 50 | 1999 | Las Palmas Open | D85 Grunfeld |
| 18. D Fernando vs F Costa |
| 1-0 | 36 | 2000 | Boavista Challenge-B | B44 Sicilian |
| 19. D Fernando vs F Costa |
| 1-0 | 41 | 2000 | Lisbon-ch | B86 Sicilian, Fischer-Sozin Attack |
| 20. F Costa vs J Gallagher |
| 0-1 | 32 | 2000 | Lisbon Summer Open | B21 Sicilian, 2.f4 and 2.d4 |
| 21. Jesus Miguel Conde Llinares vs F Costa |
| 0-1 | 60 | 2000 | Lisbon Summer Open | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 22. F Costa vs J Cordovil |
| 0-1 | 43 | 2000 | Lisbon Summer Open | B06 Robatsch |
| 23. F Costa vs S Kocic |
| 0-1 | 28 | 2000 | Lisbon Summer Open | B22 Sicilian, Alapin |
| 24. F Costa vs V Ikonnikov |
| 0-1 | 46 | 2000 | 8th Loures Masters | B22 Sicilian, Alapin |
| 25. J Cordovil vs F Costa |
| 1-0 | 44 | 2001 | Oliveira de Azemeis | B47 Sicilian, Taimanov (Bastrikov) Variation |
Kibitzing
