| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 51. M Diesen vs G Botterill |
| 1-0 | 33 | 1975 | Hastings 1974/75 | B08 Pirc, Classical |
| 52. Benko vs M Diesen |
| ½-½ | 59 | 1975 | Hastings 1974/75 | A06 Reti Opening |
| 53. M Diesen vs G Sigurjonsson |
| 0-1 | 70 | 1975 | Hastings 1974/75 | B44 Sicilian |
| 54. Hort vs M Diesen |
| 1-0 | 42 | 1975 | Hastings 1974/75 | A58 Benko Gambit |
| 55. M Diesen vs Csom |
| 0-1 | 40 | 1975 | Hastings 1974/75 | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 56. B Denman vs M Diesen |
| ½-½ | 39 | 1975 | Hastings Challengers 1975/76 | B80 Sicilian, Scheveningen |
| 57. M Diesen vs M J Franklin |
| 1-0 | 27 | 1976 | Hastings Challengers 1975/76 | B28 Sicilian, O'Kelly Variation |
| 58. Benko vs M Diesen |
 | ½-½ | 60 | 1976 | Lone Pine | A30 English, Symmetrical |
| 59. M Diesen vs Browne |
| 1-0 | 46 | 1976 | Lone Pine | E68 King's Indian, Fianchetto, Classical Variation, 8.e4 |
| 60. Denker vs M Diesen |
| 1-0 | 40 | 1976 | Lone Pine | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 61. P Biyiasas vs M Diesen |
| ½-½ | 42 | 1976 | Lone Pine | A07 King's Indian Attack |
| 62. M Diesen vs M Sisniega |
| 1-0 | 46 | 1976 | Lone Pine | B39 Sicilian, Accelerated Fianchetto, Breyer Variation |
| 63. M Diesen vs J L Watson |
| 0-1 | 34 | 1976 | Lone Pine | E69 King's Indian, Fianchetto, Classical Main line |
| 64. R Henley vs M Diesen |
| ½-½ | 12 | 1976 | Lone Pine | A38 English, Symmetrical |
| 65. Seirawan vs M Diesen |
| ½-½ | 23 | 1976 | United States Championship (Juniors) | A28 English |
| 66. M Diesen vs J Tisdall |
| ½-½ | 42 | 1976 | United States Championship (Juniors) | E21 Nimzo-Indian, Three Knights |
| 67. J Fedorowicz vs M Diesen |
| 0-1 | 42 | 1976 | United States Championship (Juniors) | B85 Sicilian, Scheveningen, Classical |
| 68. R Henley vs M Diesen |
| ½-½ | 27 | 1976 | United States Championship (Juniors) | A13 English |
| 69. M Diesen vs de Firmian |
| 1-0 | 32 | 1976 | United States Championship (Juniors) | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 70. K Regan vs M Diesen |
| ½-½ | 22 | 1976 | United States Championship (Juniors) | B22 Sicilian, Alapin |
| 71. M Diesen vs M Rohde |
| 1-0 | 49 | 1976 | United States Championship (Juniors) | B08 Pirc, Classical |
| 72. M Diesen vs Shamkovich |
| 1-0 | 45 | 1976 | Manhattan CC International | B08 Pirc, Classical |
| 73. M Diesen vs M Wilder |
| 1-0 | 31 | 1976 | Manhattan CC International | C89 Ruy Lopez, Marshall |
| 74. M Diesen vs H Olafsson |
| 0-1 | 35 | 1976 | Manhattan CC International | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 75. M Diesen vs M Flores |
| 1-0 | 40 | 1976 | World Student Team Championship qual-2 | B46 Sicilian, Taimanov Variation |
Kibitzing
