| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Portisch vs Y Porat |
| 1-0 | 30 |
1964 |
Amsterdam | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 2. Portisch vs J H Donner |
| 1-0 | 46 |
1964 |
Beverwijk | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 3. Portisch vs Smyslov |
| ½-½ | 57 |
1964 |
Havanna | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 4. Portisch vs J H Donner |
| ½-½ | 47 |
1965 |
? | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 5. Portisch vs R Fuchs |
| 1-0 | 37 |
1965 |
Erevan | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 6. Portisch vs J Johansson |
| 1-0 | 68 |
1966 |
Havanna | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 7. Portisch vs Smyslov |
 | 0-1 | 39 |
1967 |
Moscow | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 8. Portisch vs A Matanovic |
| ½-½ | 51 |
1967 |
Sousse | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 9. Portisch vs Larsen |
| 0-1 | 41 |
1968 |
Porec | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 10. Portisch vs Larsen |
| 1-0 | 57 |
1968 |
Porec | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 11. Portisch vs Gheorghiu |
 | 1-0 | 34 |
1968 |
Skopje | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 12. Portisch vs Karaklajic |
| 1-0 | 48 |
1968 |
Wijk aan Zee | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 13. Portisch vs Polugaevsky |
| ½-½ | 31 |
1969 |
Magyarorszag | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 14. Portisch vs K Langeweg |
| 1-0 | 24 |
1969 |
Amsterdam | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 15. Portisch vs F Olafsson |
 | 0-1 | 41 |
1969 |
Beverwijk | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 16. Portisch vs E Haag |
| 1-0 | 44 |
1969 |
Ungarn | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 17. Portisch vs Benko |
| ½-½ | 35 |
1969 |
Wijk aan Zee | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 18. Portisch vs F Olafsson |
| 0-1 | 41 |
1969 |
Wijk aan Zee | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 19. Portisch vs Polugaevsky |
 | 0-1 | 44 |
1970 |
Palma de Mallorca 11 | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 20. Portisch vs Smyslov |
| ½-½ | 47 |
1970 |
Palma de Mallorca | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 21. Portisch vs Browne |
| 1-0 | 39 |
1971 |
It (cat.11) | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 22. Portisch vs Smyslov |
| ½-½ | 49 |
1971 |
Amsterdam | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 23. Portisch vs Smyslov |
| ½-½ | 49 |
1971 |
Amsterdam 12/593 | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 24. Portisch vs A Pomar-Salamanca |
| ½-½ | 32 |
1972 |
Las Palmas | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 25. Portisch vs Furman |
| ½-½ | 44 |
1973 |
Madrid | E54 Nimzo-Indian, 4.e3, Gligoric System |