| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. P Ostojic vs E Cobo Arteaga |
| 0-1 | 40 | 1963 | Belgrade | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 27. D Ciric vs P Ostojic |
| 1-0 | 41 | 1963 | Belgrade | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 28. P Ostojic vs Kholmov |
| 1-0 | 46 | 1963 | Belgrade | C96 Ruy Lopez, Closed |
| 29. Matulovic vs P Ostojic |
| 1-0 | 39 | 1963 | Belgrade | B57 Sicilian |
| 30. P Ostojic vs S Nedeljkovic |
| ½-½ | 67 | 1963 | Belgrade | B80 Sicilian, Scheveningen |
| 31. Velimirovic vs P Ostojic |
| ½-½ | 43 | 1963 | Belgrade | B56 Sicilian |
| 32. P Ostojic vs J Sloth |
| 1-0 | 44 | 1964 | WchT U26 11th fin-A | B14 Caro-Kann, Panov-Botvinnik Attack |
| 33. P Ostojic vs J Adamski |
| ½-½ | 41 | 1964 | WchT U26 11th fin-A | B27 Sicilian |
| 34. Gligoric vs P Ostojic |
| 1-0 | 36 | 1965 | Yugoslav Championship | B83 Sicilian |
| 35. P Ostojic vs D Minic |
| ½-½ | 101 | 1965 | Yugoslav Championship | B90 Sicilian, Najdorf |
| 36. B Ilievski vs P Ostojic |
| 0-1 | 52 | 1965 | Yugoslav Championship | B68 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 9...Be7 |
| 37. P Ostojic vs Parma |
| 0-1 | 40 | 1965 | Yugoslav Championship | B07 Pirc |
| 38. R Bogdanovic vs P Ostojic |
| 0-1 | 39 | 1965 | Yugoslav Championship | B45 Sicilian, Taimanov |
| 39. P Ostojic vs S Leban |
| 1-0 | 57 | 1965 | Yugoslav Championship | C67 Ruy Lopez |
| 40. I Buljovcic vs P Ostojic |
| 1-0 | 40 | 1965 | Yugoslav Championship | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 41. P Ostojic vs Matulovic |
 | 0-1 | 42 | 1965 | Yugoslav Championship | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 42. V Sokolov vs P Ostojic |
| ½-½ | 47 | 1965 | Yugoslav Championship | A31 English, Symmetrical, Benoni Formation |
| 43. S Puc vs P Ostojic |
| 1-0 | 40 | 1965 | Yugoslav Championship | A56 Benoni Defense |
| 44. P Ostojic vs A Bradvarevic |
| ½-½ | 16 | 1965 | Yugoslav Championship | B45 Sicilian, Taimanov |
| 45. M Ankerst vs P Ostojic |
| ½-½ | 19 | 1965 | Yugoslav Championship | B57 Sicilian |
| 46. P Ostojic vs J Nikolac |
| ½-½ | 53 | 1965 | Yugoslav Championship | C88 Ruy Lopez |
| 47. M Damjanovic vs P Ostojic |
| ½-½ | 80 | 1965 | Yugoslav Championship | E82 King's Indian, Samisch, double Fianchetto Variation |
| 48. P Ostojic vs S Nikolic |
| 0-1 | 39 | 1965 | Yugoslav Championship | B08 Pirc, Classical |
| 49. M Bertok vs P Ostojic |
| ½-½ | 22 | 1965 | Yugoslav Championship | E61 King's Indian |
| 50. P Ostojic vs D Ciric |
| ½-½ | 22 | 1965 | Yugoslav Championship | B43 Sicilian, Kan, 5.Nc3 |
Kibitzing
