| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. O Vodep vs O Marthaler |
| 1-0 | 43 | 1961 | Graz | D60 Queen's Gambit Declined, Orthodox Defense |
| 27. O Marthaler vs A Dueckstein |
| 0-1 | 34 | 1961 | Graz | E00 Queen's Pawn Game |
| 28. O Marthaler vs A Prameshuber |
| ½-½ | 41 | 1961 | Graz | D59 Queen's Gambit Declined, Tartakower |
| 29. Pirc vs O Marthaler |
| ½-½ | 26 | 1961 | Graz | A04 Reti Opening |
| 30. O Marthaler vs Pachman |
| 0-1 | 34 | 1961 | Graz | E53 Nimzo-Indian, 4.e3 |
| 31. B Rabar vs O Marthaler |
| ½-½ | 27 | 1961 | Graz | B88 Sicilian, Fischer-Sozin Attack |
| 32. O Marthaler vs P Struner |
| 1-0 | 33 | 1961 | Graz | A04 Reti Opening |
| 33. K Darga vs O Marthaler |
| ½-½ | 23 | 1961 | Graz | B88 Sicilian, Fischer-Sozin Attack |
| 34. O Marthaler vs E Haag |
| 0-1 | 101 | 1961 | Reggio Emilia 1961/62 | A43 Old Benoni |
| 35. H Lehmann vs O Marthaler |
| 1-0 | 24 | 1961 | Reggio Emilia 1961/62 | B88 Sicilian, Fischer-Sozin Attack |
| 36. O Marthaler vs Pirc |
| ½-½ | 19 | 1961 | Reggio Emilia 1961/62 | A04 Reti Opening |
| 37. A Giustolisi vs O Marthaler |
| 1-0 | 31 | 1961 | Reggio Emilia 1961/62 | E94 King's Indian, Orthodox |
| 38. O Marthaler vs J Sanz Aguado |
| ½-½ | 45 | 1961 | Reggio Emilia 1961/62 | A90 Dutch |
| 39. T Ghitescu vs O Marthaler |
| 1-0 | 35 | 1962 | Reggio Emilia 1961/62 | D15 Queen's Gambit Declined Slav |
| 40. O Marthaler vs F Gragger |
| 0-1 | 31 | 1962 | Reggio Emilia 1961/62 | E48 Nimzo-Indian, 4.e3 O-O 5.Bd3 d5 |
| 41. N Padevsky vs O Marthaler |
| 1-0 | 31 | 1962 | Reggio Emilia 1961/62 | B63 Sicilian, Richter-Rauzer Attack |
| 42. O Marthaler vs E Canal |
| 1-0 | 32 | 1962 | Reggio Emilia 1961/62 | D02 Queen's Pawn Game |
| 43. E Romani vs O Marthaler |
| ½-½ | 17 | 1962 | Reggio Emilia 1961/62 | A49 King's Indian, Fianchetto without c4 |
| 44. O Marthaler vs E Contedini |
| ½-½ | 21 | 1962 | Reggio Emilia 1961/62 | D14 Queen's Gambit Declined Slav, Exchange Variation |
| 45. D Mohrlok vs O Marthaler |
| 1-0 | 39 | 1962 | Clare Benedict Cup | B88 Sicilian, Fischer-Sozin Attack |
| 46. H Steniczka vs O Marthaler |
| 0-1 | 36 | 1962 | Clare Benedict Cup | D01 Richter-Veresov Attack |
| 47. O Marthaler vs A Jongsma |
| ½-½ | 34 | 1962 | Clare Benedict Cup | A46 Queen's Pawn Game |
| 48. M J Franklin vs O Marthaler |
| 1-0 | 44 | 1965 | Clare Benedict Cup | A36 English |
| 49. H Hecht vs O Marthaler |
| 1-0 | 32 | 1965 | Clare Benedict Cup | B43 Sicilian, Kan, 5.Nc3 |
| 50. O Marthaler vs H Baumgartner |
| 0-1 | 36 | 1965 | Clare Benedict Cup | A13 English |
Kibitzing
