| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 51. D Mardle vs Gheorghiu |
  | 0-1 | 39 | 1964 | Hastings 1964/65 | A31 English, Symmetrical, Benoni Formation |
| 52. Keres vs D Mardle |
| 1-0 | 27 | 1964 | Hastings 1964/65 | C84 Ruy Lopez, Closed |
| 53. D Mardle vs O Hindle |
| ½-½ | 33 | 1964 | Hastings 1964/65 | E90 King's Indian |
| 54. N Littlewood vs D Mardle |
| 1-0 | 55 | 1964 | Hastings 1964/65 | B43 Sicilian, Kan, 5.Nc3 |
| 55. D Mardle vs N Gaprindashvili |
| 0-1 | 14 | 1965 | Hastings 1964/65 | B44 Sicilian |
| 56. Gligoric vs D Mardle |
| 1-0 | 34 | 1965 | Hastings 1964/65 | A56 Benoni Defense |
| 57. D Mardle vs H Pfleger |
| 0-1 | 42 | 1965 | Hastings 1964/65 | B17 Caro-Kann, Steinitz Variation |
| 58. P N Lee vs D Mardle |
| ½-½ | 36 | 1965 | Hastings 1964/65 | C89 Ruy Lopez, Marshall |
| 59. D Mardle vs A C Rocha |
| 0-1 | 46 | 1965 | Hastings 1964/65 | B94 Sicilian, Najdorf |
| 60. D Mardle vs J Toothill |
| 1-0 | 50 | 1965 | British Championship | C81 Ruy Lopez, Open, Howell Attack |
| 61. P N Lee vs D Mardle |
| 1-0 | 65 | 1965 | British Championship | B92 Sicilian, Najdorf, Opocensky Variation |
| 62. D Mardle vs J Ansell |
| 0-1 | 25 | 1965 | British Championship | C54 Giuoco Piano |
| 63. R A Harris vs D Mardle |
| ½-½ | 34 | 1965 | British Championship | A42 Modern Defense, Averbakh System |
| 64. D Mardle vs D Lees |
| ½-½ | 39 | 1965 | British Championship | B32 Sicilian |
| 65. E Davis vs D Mardle |
| 0-1 | 29 | 1965 | British Championship | B09 Pirc, Austrian Attack |
| 66. D Mardle vs M Macdonald-Ross |
| ½-½ | 41 | 1965 | British Championship | B48 Sicilian, Taimanov Variation |
| 67. D Parr vs D Mardle |
| 1-0 | 44 | 1965 | British Championship | A07 King's Indian Attack |
| 68. D Mardle vs F Parr |
| 0-1 | 21 | 1965 | British Championship | A80 Dutch |
| 69. H D Holmes vs D Mardle |
| 0-1 | 31 | 1965 | British Championship | D02 Queen's Pawn Game |
| 70. D Mardle vs D Reynolds |
| 1-0 | 41 | 1965 | British Championship | D01 Richter-Veresov Attack |
Kibitzing
