| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. S Djuric vs M Sion Castro |
| 1-0 | 26 | 1987 | Seville Open | D25 Queen's Gambit Accepted |
| 2. M Rivas Pastor vs M Sion Castro |
| ½-½ | 20 | 1988 | Leon | B44 Sicilian |
| 3. M Sion Castro vs P Cramling |
| 0-1 | 36 | 1988 | Alicante op | B43 Sicilian, Kan, 5.Nc3 |
| 4. M Rivas Pastor vs M Sion Castro |
| 1-0 | 41 | 1988 | Salamanca | A16 English |
| 5. M Sion Castro vs A Gual Pascual |
| ½-½ | 44 | 1988 | Barcelona Club d'Escacs | B90 Sicilian, Najdorf |
| 6. A Monclus Domingo vs M Sion Castro |
| 0-1 | 40 | 1988 | Barcelona Club d'Escacs | A07 King's Indian Attack |
| 7. M Sion Castro vs S Estremera Panos |
| ½-½ | 11 | 1988 | Barcelona Club d'Escacs | C69 Ruy Lopez, Exchange, Gligoric Variation |
| 8. M Sion Castro vs Z Franco Ocampos |
| ½-½ | 11 | 1988 | Barcelona Club d'Escacs | C69 Ruy Lopez, Exchange, Gligoric Variation |
| 9. M Sion Castro vs M Campos Lopez |
| 1-0 | 63 | 1988 | Barcelona Club d'Escacs | C97 Ruy Lopez, Closed, Chigorin |
| 10. M Sion Castro vs J Eslon |
| 1-0 | 61 | 1988 | Barcelona Club d'Escacs | C96 Ruy Lopez, Closed |
| 11. J C Rodriguez Talavera vs M Sion Castro |
 | 0-1 | 59 | 1988 | Barcelona Club d'Escacs | A51 Budapest Gambit |
| 12. J M Gil Gonzalez vs M Sion Castro |
| 0-1 | 39 | 1988 | Barcelona Club d'Escacs | B40 Sicilian |
| 13. M Sion Castro vs J Przewoznik |
| ½-½ | 9 | 1988 | Barcelona Club d'Escacs | C42 Petrov Defense |
| 14. V M Vehi Bach vs M Sion Castro |
| ½-½ | 35 | 1988 | Barcelona Club d'Escacs | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 15. G Andruet vs M Sion Castro |
| 1-0 | 28 | 1988 | Salamanca | D72 Neo-Grunfeld, 5.cd, Main line |
| 16. M Sion Castro vs D Lima |
| ½-½ | 10 | 1989 | Salamanca | C65 Ruy Lopez, Berlin Defense |
| 17. M Rivas Pastor vs M Sion Castro |
| 1-0 | 38 | 1989 | Salamanca | D80 Grunfeld |
| 18. M Sion Castro vs D Lima |
| ½-½ | 32 | 1989 | Sevilla op | C61 Ruy Lopez, Bird's Defense |
| 19. M Sion Castro vs Z Franco Ocampos |
| 0-1 | 61 | 1989 | Seville | B60 Sicilian, Richter-Rauzer |
| 20. Kudrin vs M Sion Castro |
| 1-0 | 46 | 1989 | Salamanca | C53 Giuoco Piano |
| 21. M Sion Castro vs S Polgar |
| 0-1 | 43 | 1989 | Salamanca | B32 Sicilian |
| 22. M Sion Castro vs J Polgar |
| 1-0 | 22 | 1989 | Salamanca | B44 Sicilian |
| 23. J Pinter vs M Sion Castro |
| 1-0 | 32 | 1989 | Leon | D83 Grunfeld, Grunfeld Gambit |
| 24. S Polgar vs M Sion Castro |
| ½-½ | 22 | 1989 | Leon | C15 French, Winawer |
| 25. M Sion Castro vs S Polgar |
| ½-½ | 13 | 1989 | Leon | B36 Sicilian, Accelerated Fianchetto |
Kibitzing
