| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Portisch vs R T Cardoso |
| ½-½ | 74 |
1956 |
Moscow | E30 Nimzo-Indian, Leningrad |
| 2. Portisch vs A Lotfee |
| 1-0 | 49 |
1956 |
Moscow | E30 Nimzo-Indian, Leningrad |
| 3. Portisch vs I Bilek |
 | 1-0 | 32 |
1957 |
HUN-ch 12th | E25 Nimzo-Indian, Samisch |
| 4. Portisch vs G Barcza |
| ½-½ | 55 |
1957 |
HUN-ch 12th | E30 Nimzo-Indian, Leningrad |
| 5. Portisch vs S Munhu |
| 1-0 | 31 |
1957 |
WchT U26 04th | E30 Nimzo-Indian, Leningrad |
| 6. Portisch vs Bobotsov |
| ½-½ | 21 |
1958 |
WchT U26 fin-A 05th | E30 Nimzo-Indian, Leningrad |
| 7. Portisch vs Berthold |
 | ½-½ | 56 |
1958 |
Munchen | E30 Nimzo-Indian, Leningrad |
| 8. Portisch vs Eliskases |
| ½-½ | 42 |
1958 |
GER | E30 Nimzo-Indian, Leningrad |
| 9. Portisch vs D Bertholdt |
| ½-½ | 56 |
1958 |
13th olm qual. group 3 | E30 Nimzo-Indian, Leningrad |
| 10. Portisch vs A Matanovic |
| ½-½ | 16 |
1959 |
Beograd | E25 Nimzo-Indian, Samisch |
| 11. Portisch vs J H Donner |
| ½-½ | 42 |
1960 |
Madrid | E31 Nimzo-Indian, Leningrad, Main line |
| 12. Portisch vs O'Kelly |
| ½-½ | 24 |
1960 |
Madrid | E30 Nimzo-Indian, Leningrad |
| 13. Portisch vs G Kluger |
| ½-½ | 24 |
1961 |
Maroczy mem | E45 Nimzo-Indian, 4.e3, Bronstein (Byrne) Variation |
| 14. Portisch vs Korchnoi |
 | 0-1 | 63 |
1961 |
Budapest | E46 Nimzo-Indian |
| 15. Portisch vs M Germek |
| ½-½ | 30 |
1961 |
Bled | E25 Nimzo-Indian, Samisch |
| 16. Portisch vs K Darga |
 | ½-½ | 25 |
1961 |
Bled | E30 Nimzo-Indian, Leningrad |
| 17. Portisch vs G Kluger |
 | 1-0 | 54 |
1962 |
Ungarn | E25 Nimzo-Indian, Samisch |
| 18. Portisch vs F Olafsson |
| ½-½ | 46 |
1962 |
Stockholm | E51 Nimzo-Indian, 4.e3 |
| 19. Portisch vs Unzicker |
| ½-½ | 33 |
1962 |
Varna | E50 Nimzo-Indian, 4.e3 O-O 5.Nf3, without ...d5 |
| 20. Portisch vs Julio Bolbochan |
| ½-½ | 59 |
1962 |
Izt | E52 Nimzo-Indian, 4.e3, Main line with ...b6 |
| 21. Portisch vs Ivkov |
| 1-0 | 89 |
1962 |
Sarajevo | E41 Nimzo-Indian |
| 22. Portisch vs P Dely |
| 1-0 | 59 |
1962 |
Ungarn | E25 Nimzo-Indian, Samisch |
| 23. Portisch vs L Barczay |
| ½-½ | 26 |
1963 |
Ungarn | E56 Nimzo-Indian, 4.e3, Main line with 7...Nc6 |
| 24. Portisch vs Larsen |
| 1-0 | 31 |
1963 |
Halle | E46 Nimzo-Indian |
| 25. Portisch vs Shamkovich |
| 1-0 | 33 |
1963 |
Sarajevo | E45 Nimzo-Indian, 4.e3, Bronstein (Byrne) Variation |