| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. P Ravn vs Portisch |
| 1-0 | 62 |
1957 |
WchT U26 04th | E41 Nimzo-Indian |
| 2. D Bertholdt vs Portisch |
| 0-1 | 56 |
1957 |
WchT U26 04th | E55 Nimzo-Indian, 4.e3, Gligoric System, Bronstein Variation |
| 3. Bjorn Haggqvist vs Portisch |
| ½-½ | 44 |
1957 |
WchT U26 04th | E41 Nimzo-Indian |
| 4. Nilson vs Portisch |
| 0-1 | 62 |
1958 |
Munchen | E39 Nimzo-Indian, Classical, Pirc Variation |
| 5. Tolush vs Portisch |
| 0-1 | 67 |
1958 |
Balatonfured | E55 Nimzo-Indian, 4.e3, Gligoric System, Bronstein Variation |
| 6. Tal vs Portisch |
 | 1-0 | 33 |
1958 |
Varna | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 7. Soos vs Portisch |
| 0-1 | 50 |
1959 |
Balatonfured | E41 Nimzo-Indian |
| 8. Szabo vs Portisch |
| 0-1 | 42 |
1959 |
Ungarn | E29 Nimzo-Indian, Samisch |
| 9. Szabo vs Portisch |
 | 1-0 | 36 |
1959 |
Budapest | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 10. J H Donner vs Portisch |
| 1-0 | 47 |
1960 |
Madrid | E31 Nimzo-Indian, Leningrad, Main line |
| 11. J H Donner vs Portisch |
| 0-1 | 29 |
1960 |
Leipzig | E55 Nimzo-Indian, 4.e3, Gligoric System, Bronstein Variation |
| 12. Szabo vs Portisch |
| ½-½ | 23 |
1961 |
Ungarn | E26 Nimzo-Indian, Samisch |
| 13. Gligoric vs Portisch |
| 1-0 | 42 |
1961 |
Torremolinos | E45 Nimzo-Indian, 4.e3, Bronstein (Byrne) Variation |
| 14. K Darga vs Portisch |
| ½-½ | 53 |
1961 |
Oberhausen | E43 Nimzo-Indian, Fischer Variation |
| 15. Taimanov vs Portisch |
| ½-½ | 35 |
1961 |
Budapest | E45 Nimzo-Indian, 4.e3, Bronstein (Byrne) Variation |
| 16. Bronstein vs Portisch |
| ½-½ | 59 |
1961 |
Budapest | E45 Nimzo-Indian, 4.e3, Bronstein (Byrne) Variation |
| 17. Szabo vs Portisch |
| ½-½ | 28 |
1961 |
HUN ch | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 18. Gligoric vs Portisch |
| ½-½ | 17 |
1961 |
Bled | E55 Nimzo-Indian, 4.e3, Gligoric System, Bronstein Variation |
| 19. Bisguier vs Portisch |
| ½-½ | 35 |
1961 |
Bled (Slovenia) | E41 Nimzo-Indian |
| 20. G Barcza vs Portisch |
| ½-½ | 26 |
1962 |
Stockholm | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 21. L Sapi vs Portisch |
| 0-1 | 32 |
1964 |
Ungarn | E53 Nimzo-Indian, 4.e3 |
| 22. T Van Scheltinga vs Portisch |
| 0-1 | 27 |
1964 |
Beverwijk | E50 Nimzo-Indian, 4.e3 O-O 5.Nf3, without ...d5 |
| 23. Z Vranesic vs Portisch |
| 0-1 | 35 |
1964 |
Amsterdam | E46 Nimzo-Indian |
| 24. J H Donner vs Portisch |
| ½-½ | 13 |
1965 |
? | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 25. J Flesch vs Portisch |
| ½-½ | 16 |
1965 |
Ungarn | E54 Nimzo-Indian, 4.e3, Gligoric System |