| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 51. M Mostertman vs S Guramishvili |
| 1-0 | 44 | 2012 | 16th HZ Open | B92 Sicilian, Najdorf, Opocensky Variation |
| 52. Van Kampen vs M Mostertman |
| ½-½ | 35 | 2012 | Groningen Open | B76 Sicilian, Dragon, Yugoslav Attack |
| 53. M Mostertman vs K Drozdowski |
| ½-½ | 53 | 2012 | Groningen Open | B05 Alekhine's Defense, Modern |
| 54. M Mostertman vs V Plat |
| ½-½ | 54 | 2012 | Groningen Open | B32 Sicilian |
| 55. D Breder vs M Mostertman |
| 1-0 | 30 | 2012 | Groningen Open | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 56. M Mostertman vs G Knol |
| 1-0 | 22 | 2012 | Groningen Open | B01 Scandinavian |
| 57. E Goudriaan vs M Mostertman |
| 0-1 | 40 | 2012 | Groningen Open | E06 Catalan, Closed, 5.Nf3 |
| 58. Naroditsky vs M Mostertman |
 | 1-0 | 32 | 2012 | Groningen Open | A07 King's Indian Attack |
| 59. M Mostertman vs M de Jong |
| 1-0 | 30 | 2012 | Groningen Open | C07 French, Tarrasch |
| 60. M Mostertman vs M den Hartog |
| 0-1 | 28 | 2013 | Groningen Chess Festival | E97 King's Indian |
| 61. P Theulings vs M Mostertman |
| 0-1 | 29 | 2013 | Groningen Chess Festival | A15 English |
| 62. M Mostertman vs D Stavast |
| 1-0 | 46 | 2013 | Groningen Chess Festival | B07 Pirc |
| 63. M Mostertman vs S Azaladze |
| 0-1 | 56 | 2013 | Groningen Chess Festival | B06 Robatsch |
| 64. L van Foreest vs M Mostertman |
| 0-1 | 29 | 2013 | Groningen Chess Festival | E10 Queen's Pawn Game |
| 65. D Klein vs M Mostertman |
| 1-0 | 37 | 2013 | Groningen Chess Festival | C77 Ruy Lopez |
| 66. M Mostertman vs J R Markus |
| 1-0 | 57 | 2013 | Groningen Chess Festival | C58 Two Knights |
| 67. A Donchenko vs M Mostertman |
 | 1-0 | 34 | 2013 | Groningen Chess Festival | E06 Catalan, Closed, 5.Nf3 |
| 68. M Mostertman vs J Offringa |
| 0-1 | 20 | 2013 | Groningen Chess Festival | B07 Pirc |
| 69. M Mostertman vs Ganguly |
| 0-1 | 30 | 2024 | Biel Master Open | C58 Two Knights |
| 70. B Panda vs M Mostertman |
| ½-½ | 37 | 2024 | Biel Master Open | A11 English, Caro-Kann Defensive System |
| 71. M Mostertman vs J J Fronda |
| 0-1 | 42 | 2024 | Biel Master Open | B75 Sicilian, Dragon, Yugoslav Attack |
| 72. J Selinga vs M Mostertman |
| 0-1 | 27 | 2024 | Biel Master Open | D45 Queen's Gambit Declined Semi-Slav |
| 73. M Mostertman vs K Pisan |
| 1-0 | 68 | 2024 | Biel Master Open | B12 Caro-Kann Defense |
| 74. V Agrawal vs M Mostertman |
| 0-1 | 52 | 2024 | Biel Master Open | D30 Queen's Gambit Declined |
| 75. M Mostertman vs S Chinguun |
| 0-1 | 59 | 2024 | Biel Master Open | B90 Sicilian, Najdorf |
Kibitzing
