| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Portisch vs Tringov |
| ½-½ | 40 |
1955 |
Wch U20 prel-B | E97 King's Indian |
| 2. Portisch vs P Dely |
| ½-½ | 36 |
1956 |
Budapest | E99 King's Indian, Orthodox, Taimanov |
| 3. Portisch vs G Kluger |
| ½-½ | 44 |
1957 |
HUN-ch 12th | E73 King's Indian |
| 4. Portisch vs J Kozma |
 | 1-0 | 40 |
1957 |
? | E62 King's Indian, Fianchetto |
| 5. Portisch vs T Florian |
| 1-0 | 45 |
1957 |
HUN-ch 12th | E63 King's Indian, Fianchetto, Panno Variation |
| 6. Portisch vs M Bertok |
| ½-½ | 19 |
1957 |
HUN-JUG m | E95 King's Indian, Orthodox, 7...Nbd7, 8.Re1 |
| 7. Portisch vs Mednis |
| 0-1 | 40 |
1957 |
WchT U26 04th | E63 King's Indian, Fianchetto, Panno Variation |
| 8. Portisch vs J Penrose |
| ½-½ | 27 |
1958 |
Munchen | E69 King's Indian, Fianchetto, Classical Main line |
| 9. Portisch vs E Orendy |
| 1-0 | 36 |
1959 |
HUN Ch 15th | E62 King's Indian, Fianchetto |
| 10. Portisch vs G Kluger |
| ½-½ | 22 |
1959 |
HUN-ch 15th | E60 King's Indian Defense |
| 11. Portisch vs Spassky |
| ½-½ | 42 |
1959 |
Moscow | E63 King's Indian, Fianchetto, Panno Variation |
| 12. Portisch vs S Dittmann |
| 1-0 | 41 |
1959 |
? | E93 King's Indian, Petrosian System |
| 13. Portisch vs Gligoric |
| 1-0 | 61 |
1960 |
Madrid | E99 King's Indian, Orthodox, Taimanov |
| 14. Portisch vs W Attard |
| 1-0 | 41 |
1960 |
Madrid | E99 King's Indian, Orthodox, Taimanov |
| 15. Portisch vs Gligoric |
| ½-½ | 14 |
1960 |
Madrid | E97 King's Indian |
| 16. Portisch vs R Toran Albero |
| 1-0 | 43 |
1961 |
Oberhausen | E67 King's Indian, Fianchetto |
| 17. Portisch vs Najdorf |
| ½-½ | 41 |
1961 |
Bled | E69 King's Indian, Fianchetto, Classical Main line |
| 18. Portisch vs Udovcic |
| 1-0 | 33 |
1961 |
Bled | E96 King's Indian, Orthodox, 7...Nbd7, Main line |
| 19. Portisch vs M Bertok |
| ½-½ | 14 |
1961 |
Bled | E64 King's Indian, Fianchetto, Yugoslav System |
| 20. Portisch vs Najdorf |
| 0-1 | 53 |
1961 |
Torremolinos | E96 King's Indian, Orthodox, 7...Nbd7, Main line |
| 21. Portisch vs Geller |
 | 0-1 | 40 |
1961 |
Bled | E67 King's Indian, Fianchetto |
| 22. Portisch vs Tal |
| ½-½ | 15 |
1961 |
Bled | E66 King's Indian, Fianchetto, Yugoslav Panno |
| 23. Portisch vs Szabo |
| 1-0 | 44 |
1961 |
Ungarn | E67 King's Indian, Fianchetto |
| 24. Portisch vs M Aaron |
 | 0-1 | 27 |
1962 |
Varna | E69 King's Indian, Fianchetto, Classical Main line |
| 25. Portisch vs S Schweber |
| 1-0 | 41 |
1962 |
Stockholm | E92 King's Indian |