| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 51. P Troeger vs J Kostro |
| ½-½ | 78 | 1960 | Budapest Zonal | A46 Queen's Pawn Game |
| 52. J Kostro vs T van Scheltinga |
| 0-1 | 25 | 1960 | Budapest Zonal | B43 Sicilian, Kan, 5.Nc3 |
| 53. I Bilek vs J Kostro |
| 1-0 | 27 | 1960 | Budapest Zonal | A08 King's Indian Attack |
| 54. J Kostro vs A Matanovic |
| 0-1 | 75 | 1960 | Budapest Zonal | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 55. Barcza vs J Kostro |
| 1-0 | 41 | 1960 | Budapest Zonal | A14 English |
| 56. J Kostro vs U Raisa |
| 0-1 | 56 | 1960 | Budapest Zonal | B43 Sicilian, Kan, 5.Nc3 |
| 57. J Kozma vs J Kostro |
| 1-0 | 30 | 1960 | Budapest Zonal | A07 King's Indian Attack |
| 58. J Kostro vs L Popov |
| 1-0 | 78 | 1960 | Budapest Zonal | B04 Alekhine's Defense, Modern |
| 59. J Kostro vs K Janetschek |
| 1-0 | 60 | 1960 | Leipzig Olympiad qual-2 | C92 Ruy Lopez, Closed |
| 60. J Kostro vs A Foguelman |
| 0-1 | 32 | 1960 | Leipzig Olympiad qual-2 | C18 French, Winawer |
| 61. J Kostro vs K Langeweg |
| ½-½ | 32 | 1960 | Leipzig Olympiad qual-2 | B29 Sicilian, Nimzovich-Rubinstein |
| 62. D de Oliveira vs J Kostro |
| 0-1 | 48 | 1960 | Leipzig Olympiad qual-2 | E16 Queen's Indian |
| 63. J Kostro vs J Deslauriers |
| ½-½ | 25 | 1960 | Leipzig Olympiad qual-2 | B06 Robatsch |
| 64. Ramesh D Seth vs J Kostro |
| ½-½ | 47 | 1960 | Leipzig Olympiad qual-2 | C99 Ruy Lopez, Closed, Chigorin, 12...cd |
| 65. J Kostro vs Smyslov |
 | 0-1 | 21 | 1960 | Leipzig Olympiad qual-2 | C67 Ruy Lopez |
| 66. J Kostro vs E Jensen |
| 1-0 | 46 | 1960 | Leipzig Olympiad Final-B | B01 Scandinavian |
| 67. J Diez del Corral vs J Kostro |
| ½-½ | 41 | 1960 | Leipzig Olympiad Final-B | C85 Ruy Lopez, Exchange Variation Doubly Deferred (DERLD) |
| 68. J Kostro vs E Myhre |
| 1-0 | 33 | 1960 | Leipzig Olympiad Final-B | B39 Sicilian, Accelerated Fianchetto, Breyer Variation |
| 69. J Kostro vs Mulk Raj Wahi |
| 1-0 | 47 | 1960 | Leipzig Olympiad Final-B | B40 Sicilian |
| 70. O Magnusson vs J Kostro |
| ½-½ | 59 | 1960 | Leipzig Olympiad Final-B | E16 Queen's Indian |
| 71. J Kostro vs I Aloni |
| ½-½ | 42 | 1960 | Leipzig Olympiad Final-B | C90 Ruy Lopez, Closed |
| 72. J Salas Romo vs J Kostro |
| 1-0 | 47 | 1960 | Leipzig Olympiad Final-B | C70 Ruy Lopez |
| 73. J Kostro vs J Rodriguez Gonzalez |
| ½-½ | 27 | 1960 | Leipzig Olympiad Final-B | B77 Sicilian, Dragon, Yugoslav Attack |
| 74. U Raisa vs J Kostro |
| 0-1 | 52 | 1960 | Leipzig Olympiad Final-B | E59 Nimzo-Indian, 4.e3, Main line |
| 75. J Kostro vs J Lachut |
| ½-½ | 43 | 1961 | Polish Championship | C97 Ruy Lopez, Closed, Chigorin |
Kibitzing
