Game |
| Result | Moves |
Year | Event/Locale | Opening |
26. Timman vs P Ostermeyer |
 | 1-0 | 17 | 1975 | Reykjavik Zonal | E30 Nimzo-Indian, Leningrad |
27. P Ostermeyer vs V Liberzon |
| ½-½ | 55 | 1975 | Reykjavik Zonal | E82 King's Indian, Samisch, double Fianchetto Variation |
28. J Murray vs P Ostermeyer |
| ½-½ | 24 | 1975 | Reykjavik Zonal | E94 King's Indian, Orthodox |
29. P Ostermeyer vs Jansa |
| ½-½ | 59 | 1975 | Reykjavik Zonal | B46 Sicilian, Taimanov Variation |
30. Parma vs P Ostermeyer |
| ½-½ | 28 | 1975 | Reykjavik Zonal | B84 Sicilian, Scheveningen |
31. P Ostermeyer vs B Thorsteinsson |
| 1-0 | 36 | 1975 | Reykjavik Zonal | C74 Ruy Lopez, Modern Steinitz Defense |
32. E Laine vs P Ostermeyer |
| 0-1 | 33 | 1975 | Reykjavik Zonal | E32 Nimzo-Indian, Classical |
33. P Ostermeyer vs H Van den Broeck |
| 1-0 | 30 | 1975 | Reykjavik Zonal | C07 French, Tarrasch |
34. Ribli vs P Ostermeyer |
| ½-½ | 41 | 1975 | Reykjavik Zonal | A05 Reti Opening |
35. P Ostermeyer vs P Poutiainen |
| ½-½ | 19 | 1975 | Reykjavik Zonal | B88 Sicilian, Fischer-Sozin Attack |
36. W Hartston vs P Ostermeyer |
| 1-0 | 41 | 1975 | Reykjavik Zonal | B90 Sicilian, Najdorf |
37. P Ostermeyer vs S Hamann |
| 1-0 | 28 | 1975 | Reykjavik Zonal | B92 Sicilian, Najdorf, Opocensky Variation |
38. F Olafsson vs P Ostermeyer |
| ½-½ | 55 | 1975 | Reykjavik Zonal | E60 King's Indian Defense |
39. P Ostermeyer vs A Zwaig |
| 0-1 | 90 | 1975 | Reykjavik Zonal | C70 Ruy Lopez |
40. I Kanko vs P Ostermeyer |
| 0-1 | 51 | 1976 | Haifa Olympiad | A55 Old Indian, Main line |
41. P Ostermeyer vs K Janetschek |
| 1-0 | 41 | 1976 | Haifa Olympiad | C61 Ruy Lopez, Bird's Defense |
42. L Bronstein vs P Ostermeyer |
| 1-0 | 37 | 1976 | Haifa Olympiad | B18 Caro-Kann, Classical |
43. P Ostermeyer vs L Lederman |
| 0-1 | 53 | 1976 | Haifa Olympiad | B90 Sicilian, Najdorf |
44. P Ostermeyer vs M Knezevic |
| ½-½ | 43 | 1977 | European Team Championship | C67 Ruy Lopez |
45. E Meduna vs P Ostermeyer |
| 0-1 | 33 | 1977 | European Team Championship | A15 English |
46. Dorfman vs P Ostermeyer |
| ½-½ | 41 | 1977 | European Team Championship | E94 King's Indian, Orthodox |
47. P Ostermeyer vs S Webb |
| ½-½ | 56 | 1977 | European Team Championship | C07 French, Tarrasch |
48. P Ostermeyer vs Huebner |
 | 1-0 | 35 | 1978 | GER-W chT 7778 | B25 Sicilian, Closed |
49. P Ostermeyer vs M Glienke |
| 1-0 | 36 | 1978 | BL-W 7778 | B35 Sicilian, Accelerated Fianchetto, Modern Variation with Bc4 |
50. P Ostermeyer vs T Sandmeier |
| ½-½ | 49 | 1978 | West German Championship | B83 Sicilian |