| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. P Ostermeyer vs D van Enk |
| 1-0 | 33 | 1963 | Niemeyer Juniors | C75 Ruy Lopez, Modern Steinitz Defense |
| 2. M Bratzlavsky vs P Ostermeyer |
| 0-1 | 39 | 1963 | Niemeyer Juniors | A66 Benoni |
| 3. P Ostermeyer vs M Daumens |
 | 1-0 | 25 | 1969 | World Student Team Championship qual-2 | D60 Queen's Gambit Declined, Orthodox Defense |
| 4. G Sperber vs P Ostermeyer |
| 0-1 | 41 | 1969 | World Student Team Championship qual-2 | A48 King's Indian |
| 5. P Ostermeyer vs S Pedersen |
| ½-½ | 41 | 1969 | World Student Team Championship qual-2 | A56 Benoni Defense |
| 6. P Ostermeyer vs G Botterill |
| 1-0 | 38 | 1969 | World Student Team Championship Final-A | E43 Nimzo-Indian, Fischer Variation |
| 7. P Ostermeyer vs J Kolbak |
| 0-1 | 75 | 1969 | World Student Team Championship Final-A | A56 Benoni Defense |
| 8. P Ostermeyer vs M Despotovic |
| 1-0 | 47 | 1969 | World Student Team Championship Final-A | E47 Nimzo-Indian, 4.e3 O-O 5.Bd3 |
| 9. F Bachmann vs P Ostermeyer |
| ½-½ | 26 | 1973 | Dortmund | A15 English |
| 10. P Ostermeyer vs Pachman |
| ½-½ | 50 | 1974 | West Germany BDR | E67 King's Indian, Fianchetto |
| 11. W Reichenbach vs P Ostermeyer |
| ½-½ | 43 | 1975 | FRG-ch International | E67 King's Indian, Fianchetto |
| 12. M Gerusel vs P Ostermeyer |
| ½-½ | 23 | 1975 | FRG-ch International | E11 Bogo-Indian Defense |
| 13. P Ostermeyer vs Pachman |
| 0-1 | 24 | 1975 | FRG-ch International | A06 Reti Opening |
| 14. Parma vs P Ostermeyer |
| 1-0 | 38 | 1975 | FRG-ch International | B70 Sicilian, Dragon Variation |
| 15. P Ostermeyer vs J Eising |
| 1-0 | 40 | 1975 | FRG-ch International | B40 Sicilian |
| 16. Westerinen vs P Ostermeyer |
| ½-½ | 90 | 1975 | FRG-ch International | B55 Sicilian, Prins Variation, Venice Attack |
| 17. P Ostermeyer vs Sosonko |
| 0-1 | 21 | 1975 | FRG-ch International | B76 Sicilian, Dragon, Yugoslav Attack |
| 18. R Mallee vs P Ostermeyer |
| 0-1 | 29 | 1975 | FRG-ch International | B77 Sicilian, Dragon, Yugoslav Attack |
| 19. P Ostermeyer vs H Kestler |
| ½-½ | 44 | 1975 | FRG-ch International | B44 Sicilian |
| 20. A Lombard vs P Ostermeyer |
| ½-½ | 25 | 1975 | FRG-ch International | E40 Nimzo-Indian, 4.e3 |
| 21. P Ostermeyer vs Browne |
| 0-1 | 35 | 1975 | FRG-ch International | B93 Sicilian, Najdorf, 6.f4 |
| 22. P Ostermeyer vs E Mednis |
| ½-½ | 27 | 1975 | FRG-ch International | C04 French, Tarrasch, Guimard Main line |
| 23. P Ostermeyer vs J Dueball |
| ½-½ | 60 | 1975 | FRG-ch International | B31 Sicilian, Rossolimo Variation |
| 24. P Ostermeyer vs Keene |
| ½-½ | 19 | 1975 | FRG-ch International | A04 Reti Opening |
| 25. D Minic vs P Ostermeyer |
| 1-0 | 30 | 1975 | FRG-ch International | B75 Sicilian, Dragon, Yugoslav Attack |
Kibitzing
