| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 26. S Mariotti vs R Cosulich |
| 1-0 | 12 |
1971 |
Venezia | A45 Queen's Pawn Game |
| 27. S Mariotti vs Keene |
| 0-1 | 36 |
1971 |
Hammersmith Open | B06 Robatsch |
| 28. S Mariotti vs Gligoric |
 | 1-0 | 41 |
1971 |
Venezia | C51 Evans Gambit |
| 29. S Mariotti vs Vila |
| 1-0 | 29 |
1972 |
Skopje-Krusevo-Ohrid | B89 Sicilian |
| 30. R Rodriguez vs S Mariotti |
| 0-1 | 76 |
1972 |
Skopje ol (Men) fin-B | C60 Ruy Lopez |
| 31. Hartston vs S Mariotti |
| 0-1 | 33 |
1972 |
Skopje ol | C25 Vienna |
| 32. S Mariotti vs E Paoli |
| 1-0 | 35 |
1972 |
Firenze | D79 Neo-Grunfeld, 6.O-O, Main line |
| 33. Garcia vs S Mariotti |
 | 1-0 | 30 |
1972 |
Olot | C60 Ruy Lopez |
| 34. S Mariotti vs Pinson |
| 1-0 | 24 |
1973 |
corr 1.EU tt, Vorrunde | B48 Sicilian, Taimanov Variation |
| 35. S Mariotti vs G Garcia Gonzales |
| 1-0 | 43 |
1974 |
Nica | E22 Nimzo-Indian, Spielmann Variation |
| 36. E Paoli vs S Mariotti |
| 0-1 | 48 |
1974 |
Lucca op | B73 Sicilian, Dragon, Classical |
| 37. S Mariotti vs B Toth |
| ½-½ | 18 |
1974 |
Italien | C42 Petrov Defense |
| 38. S Mariotti vs Timman |
 | 0-1 | 19 |
1974 |
Venetie (05) | C00 French Defense |
| 39. S Mariotti vs Savon |
| 1-0 | 77 |
1974 |
Venezia | B13 Caro-Kann, Exchange |
| 40. S Mariotti vs Suttles |
| 0-1 | 43 |
1974 |
Venice | A40 Queen's Pawn Game |
| 41. W Schmidt vs S Mariotti |
 | 0-1 | 33 |
1974 |
Nice (ol) | A92 Dutch |
| 42. Tarjan vs S Mariotti |
| 1-0 | 26 |
1974 |
Venezia | C64 Ruy Lopez, Classical |
| 43. Hug vs S Mariotti |
 | 0-1 | 34 |
1974 |
Nica | C64 Ruy Lopez, Classical |
| 44. M Albano vs S Mariotti |
 | ½-½ | 24 |
1974 |
Camp Ita Sq | B05 Alekhine's Defense, Modern |
| 45. Gligoric vs S Mariotti |
| ½-½ | 43 |
1974 |
Nice ol (Men) prel | A94 Dutch, Stonewall with Ba3 |
| 46. E Paoli vs S Mariotti |
| 0-1 | 37 |
1974 |
ITA-ch 35th | B84 Sicilian, Scheveningen |
| 47. J L Seret vs S Mariotti |
| 1-0 | 41 |
1975 |
1st EEC Team Ch. | B40 Sicilian |
| 48. S Mariotti vs Ljubojevic |
| ½-½ | 40 |
1975 |
Portoroz/Ljubljana 19/454 | B90 Sicilian, Najdorf |
| 49. S Mariotti vs P Poutiainen |
 | 0-1 | 64 |
1975 |
Budapest Hungary | B06 Robatsch |
| 50. S Mariotti vs Furman |
| 0-1 | 45 |
1975 |
Portoroz/Ljubljana | B42 Sicilian, Kan |