| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 51. W Hartston vs P Ostermeyer |
| 1-0 | 41 | 1975 | Reykjavik Zonal | B90 Sicilian, Najdorf |
| 52. P Ostermeyer vs S Hamann |
| 1-0 | 28 | 1975 | Reykjavik Zonal | B92 Sicilian, Najdorf, Opocensky Variation |
| 53. F Olafsson vs P Ostermeyer |
| ½-½ | 55 | 1975 | Reykjavik Zonal | E60 King's Indian Defense |
| 54. P Ostermeyer vs A Zwaig |
| 0-1 | 90 | 1975 | Reykjavik Zonal | C70 Ruy Lopez |
| 55. I Kanko vs P Ostermeyer |
| 0-1 | 51 | 1976 | Haifa Olympiad | A55 Old Indian, Main line |
| 56. P Ostermeyer vs K Janetschek |
| 1-0 | 41 | 1976 | Haifa Olympiad | C61 Ruy Lopez, Bird's Defense |
| 57. L Bronstein vs P Ostermeyer |
| 1-0 | 37 | 1976 | Haifa Olympiad | B18 Caro-Kann, Classical |
| 58. P Ostermeyer vs L Lederman |
| 0-1 | 53 | 1976 | Haifa Olympiad | B90 Sicilian, Najdorf |
| 59. P Ostermeyer vs M Knezevic |
| ½-½ | 43 | 1977 | European Team Championship | C67 Ruy Lopez |
| 60. E Meduna vs P Ostermeyer |
| 0-1 | 33 | 1977 | European Team Championship | A15 English |
| 61. Dorfman vs P Ostermeyer |
| ½-½ | 41 | 1977 | European Team Championship | E94 King's Indian, Orthodox |
| 62. P Ostermeyer vs S Webb |
| ½-½ | 56 | 1977 | European Team Championship | C07 French, Tarrasch |
| 63. P Ostermeyer vs M Glienke |
| 1-0 | 36 | 1978 | BL-W 7778 | B35 Sicilian, Accelerated Fianchetto, Modern Variation with Bc4 |
| 64. P Ostermeyer vs Huebner |
 | 1-0 | 35 | 1978 | GER-W chT 7778 | B25 Sicilian, Closed |
| 65. M Boehm vs P Ostermeyer |
| 0-1 | 58 | 1978 | West German Championship | A45 Queen's Pawn Game |
| 66. P Ostermeyer vs H Fecht |
| 1-0 | 43 | 1978 | West German Championship | B33 Sicilian |
| 67. K Podzielny vs P Ostermeyer |
| ½-½ | 40 | 1978 | West German Championship | E69 King's Indian, Fianchetto, Classical Main line |
| 68. P Ostermeyer vs M Hermann |
| ½-½ | 25 | 1978 | West German Championship | C63 Ruy Lopez, Schliemann Defense |
| 69. H Lieb vs P Ostermeyer |
| 0-1 | 51 | 1978 | West German Championship | B29 Sicilian, Nimzovich-Rubinstein |
| 70. P Ostermeyer vs M Gerusel |
| ½-½ | 41 | 1978 | West German Championship | B42 Sicilian, Kan |
| 71. P Ostermeyer vs T Sandmeier |
| ½-½ | 49 | 1978 | West German Championship | B83 Sicilian |
| 72. B Feustel vs P Ostermeyer |
| 0-1 | 35 | 1978 | West German Championship | A15 English |
| 73. P Ostermeyer vs H Reefschlaeger |
| 0-1 | 41 | 1978 | West German Championship | C05 French, Tarrasch |
| 74. Pachman vs P Ostermeyer |
| 1-0 | 24 | 1978 | West German Championship | E82 King's Indian, Samisch, double Fianchetto Variation |
| 75. P Ostermeyer vs W Huisl |
| ½-½ | 37 | 1978 | West German Championship | C67 Ruy Lopez |
Kibitzing
