| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. M Wittwer vs P Cladouras |
| ½-½ | 13 | 1983 | Mitropa Cup | C50 Giuoco Piano |
| 27. M Wittwer vs H Fuchs |
| ½-½ | 44 | 1985 | Baden-SUI tt | B57 Sicilian |
| 28. H Fuchs vs M Wittwer |
| 1-0 | 43 | 1985 | Baden-SUI tt | C02 French, Advance |
| 29. M Wittwer vs A Hirzel |
| 1-0 | 41 | 1986 | Winterthur | C18 French, Winawer |
| 30. M Wittwer vs E Shvidler |
| ½-½ | 30 | 1988 | Kobanya Open | C92 Ruy Lopez, Closed |
| 31. M Klauser vs M Wittwer |
| 0-1 | 40 | 1988 | Kobanya Open | A11 English, Caro-Kann Defensive System |
| 32. A Bossi vs M Wittwer |
| 1-0 | 30 | 1989 | Zuerich op | D14 Queen's Gambit Declined Slav, Exchange Variation |
| 33. B Kamber vs M Wittwer |
 | ½-½ | 50 | 1989 | Bern Open | C26 Vienna |
| 34. T Leu vs M Wittwer |
| 0-1 | 38 | 1989 | Bern Open | C97 Ruy Lopez, Closed, Chigorin |
| 35. R Simon vs M Wittwer |
| 1-0 | 32 | 1989 | Bern Open | A06 Reti Opening |
| 36. M Wittwer vs A Domont |
| 0-1 | 55 | 1989 | Bern Open | D16 Queen's Gambit Declined Slav |
| 37. M Wittwer vs M Gisler |
| 1-0 | 21 | 1989 | Bern Open | C82 Ruy Lopez, Open |
| 38. N Giertz vs M Wittwer |
| 1-0 | 37 | 1990 | Zuerich op | D03 Torre Attack (Tartakower Variation) |
| 39. M Wittwer vs W Schmid |
| 0-1 | 37 | 1990 | Zuerich op | B01 Scandinavian |
| 40. M Wittwer vs D Good |
| 1-0 | 27 | 1990 | Zuerich op | C10 French |
| 41. I Nemet vs M Wittwer |
| 1-0 | 31 | 1990 | Zuerich op | D15 Queen's Gambit Declined Slav |
| 42. C Baumann vs M Wittwer |
| 1-0 | 19 | 1990 | Bad Ragaz Open | E32 Nimzo-Indian, Classical |
| 43. R Gerber vs M Wittwer |
| 1-0 | 41 | 1993 | SUI-chT | A46 Queen's Pawn Game |
| 44. A Robert vs M Wittwer |
| ½-½ | 25 | 1993 | SUI-chT | E14 Queen's Indian |
| 45. M Wittwer vs C Flueckiger |
| 0-1 | 45 | 1993 | SUI-chT | C24 Bishop's Opening |
| 46. M Wittwer vs C Maier |
| 0-1 | 39 | 1993 | SUI-chT | E67 King's Indian, Fianchetto |
| 47. S Wobbe vs M Wittwer |
| 0-1 | 24 | 1993 | Biel op-C | C11 French |
| 48. C Flueckiger vs M Wittwer |
| 1-0 | 41 | 1994 | SUI-chT | A00 Uncommon Opening |
| 49. M Wittwer vs E Bhend |
| ½-½ | 28 | 1994 | SUI-chT | A80 Dutch |
| 50. M Wittwer vs G Kiefer |
| 0-1 | 36 | 1994 | SUI-chT | E61 King's Indian |
Kibitzing
