| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. M F Littleton vs S Mariotti |
| ½-½ | 44 |
1969 |
Praia da Rocha | B93 Sicilian, Najdorf, 6.f4 |
| 2. H Schaufelberger vs S Mariotti |
 | 0-1 | 38 |
1969 |
Praia | B53 Sicilian |
| 3. R Bellin vs S Mariotti |
| ½-½ | 40 |
1970 |
Islington Junior A | B22 Sicilian, Alapin |
| 4. Miles vs S Mariotti |
| 0-1 | 36 |
1970 |
Islington Junior A | B87 Sicilian, Fischer-Sozin with ...a6 and ...b5 |
| 5. E Paoli vs S Mariotti |
| 0-1 | 48 |
1974 |
Lucca op | B73 Sicilian, Dragon, Classical |
| 6. E Paoli vs S Mariotti |
| 0-1 | 37 |
1974 |
ITA-ch 35th | B84 Sicilian, Scheveningen |
| 7. A Planinc vs S Mariotti |
| 0-1 | 35 |
1975 |
Portoroz/Ljubljana | B84 Sicilian, Scheveningen |
| 8. Unzicker vs S Mariotti |
| ½-½ | 42 |
1975 |
Milano | B43 Sicilian, Kan, 5.Nc3 |
| 9. J L Seret vs S Mariotti |
| 1-0 | 41 |
1975 |
1st EEC Team Ch. | B40 Sicilian |
| 10. Ljubojevic vs S Mariotti |
 | 1-0 | 64 |
1976 |
Manila | B96 Sicilian, Najdorf |
| 11. E Torre vs S Mariotti |
| ½-½ | 57 |
1976 |
Izt (cat.12) | B96 Sicilian, Najdorf |
| 12. Spassky vs S Mariotti |
| ½-½ | 36 |
1976 |
Izt ( cat. 12 ) | B42 Sicilian, Kan |
| 13. Spassky vs S Mariotti |
| ½-½ | 36 |
1976 |
Manila | B42 Sicilian, Kan |
| 14. Matulovic vs S Mariotti |
| ½-½ | 40 |
1978 |
Praia da Rocha zt | B49 Sicilian, Taimanov Variation |
| 15. Parma vs S Mariotti |
| 1-0 | 33 |
1980 |
Rome | B28 Sicilian, O'Kelly Variation |
| 16. J Guimaraes vs S Mariotti |
| 0-1 | 24 |
1981 |
Zt ( cat. 6 ) | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 17. Nunn vs S Mariotti |
| 1-0 | 37 |
1981 |
Wiesbaden | B28 Sicilian, O'Kelly Variation |
| 18. W Attard vs S Mariotti |
| 0-1 | 36 |
1981 |
Zt ( cat. 6 ) | B43 Sicilian, Kan, 5.Nc3 |
| 19. S Soylu vs S Mariotti |
| 0-1 | 43 |
1981 |
Zt ( cat. 6 ) | B28 Sicilian, O'Kelly Variation |
| 20. S Tilak vs S Mariotti |
| 1-0 | 48 |
1986 |
Dubai | B28 Sicilian, O'Kelly Variation |
| 21. D Izquierdo vs S Mariotti |
| ½-½ | 19 |
1986 |
Dubai | B40 Sicilian |
| 22. Antunes vs S Mariotti |
| 1-0 | 35 |
1987 |
Andorra | B40 Sicilian |
| 23. P Gagliardi vs S Mariotti |
| 0-1 | 39 |
1990 |
Roma | B93 Sicilian, Najdorf, 6.f4 |
| 24. C Perissinotto vs S Mariotti |
| 0-1 | 40 |
1994 |
It (open), XI | B22 Sicilian, Alapin |