| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. M Grassi vs E Paoli |
| 1-0 | 56 | 1957 | Italian Championship | B27 Sicilian |
| 2. M Grassi vs A Siveri |
| 1-0 | 49 | 1957 | Italian Championship | D57 Queen's Gambit Declined, Lasker Defense |
| 3. A D'Augusta vs M Grassi |
| 0-1 | 28 | 1957 | Italian Championship | A03 Bird's Opening |
| 4. M Grassi vs M Napolitano |
| 0-1 | 55 | 1957 | Italian Championship | A46 Queen's Pawn Game |
| 5. G Laco vs M Grassi |
| 1-0 | 84 | 1957 | Italian Championship | A28 English |
| 6. V Nestler vs M Grassi |
| 1-0 | 38 | 1957 | Italian Championship | C00 French Defense |
| 7. M Grassi vs M Tamburini |
| 1-0 | 46 | 1957 | Italian Championship | E12 Queen's Indian |
| 8. F Norcia vs M Grassi |
| 1-0 | 35 | 1957 | Italian Championship | E04 Catalan, Open, 5.Nf3 |
| 9. M Grassi vs E Romani |
| ½-½ | 17 | 1957 | Italian Championship | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 10. G Primavera vs M Grassi |
| 1-0 | 74 | 1957 | Italian Championship | E24 Nimzo-Indian, Samisch |
| 11. M Grassi vs A Magrin |
| 1-0 | 25 | 1957 | Italian Championship | B01 Scandinavian |
| 12. F Palmiotto vs M Grassi |
| 1-0 | 35 | 1957 | Italian Championship | E34 Nimzo-Indian, Classical, Noa Variation |
| 13. M Romi vs M Grassi |
| 1-0 | 27 | 1957 | Italian Championship | D02 Queen's Pawn Game |
| 14. M Grassi vs B N Rometti |
| 1-0 | 33 | 1960 | Imperia | C77 Ruy Lopez |
| 15. M Grassi vs G Porreca |
| 0-1 | 19 | 1960 | Imperia | C50 Giuoco Piano |
| 16. D Ugrinovic vs M Grassi |
| 1-0 | 38 | 1967 | Imperia op | C00 French Defense |
| 17. J Bekvalac vs M Grassi |
| 1-0 | 33 | 1967 | Imperia op | C02 French, Advance |
| 18. M Grassi vs M Romi |
| 1-0 | 34 | 1967 | Imperia op | B13 Caro-Kann, Exchange |
| 19. E Paoli vs M Grassi |
| ½-½ | 93 | 1968 | ITA-ch | B32 Sicilian |
| 20. Andrea Marchiori vs M Grassi |
| 1-0 | 38 | 1969 | ITA-chT | B21 Sicilian, 2.f4 and 2.d4 |
| 21. R Primavera vs M Grassi |
| 1-0 | 23 | 1970 | Italian Championship | C15 French, Winawer |
| 22. M Grassi vs A Rosino |
| 1-0 | 41 | 1970 | Italian Championship | C67 Ruy Lopez |
| 23. M Grassi vs A Capece |
| 1-0 | 39 | 1970 | Italian Championship | A37 English, Symmetrical |
| 24. M Romi vs M Grassi |
| 1-0 | 40 | 1970 | Italian Championship | A17 English |
| 25. M Grassi vs A Giustolisi |
| 0-1 | 24 | 1970 | Italian Championship | B43 Sicilian, Kan, 5.Nc3 |
Kibitzing
