| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. I Johannsson vs Portisch |
| 0-1 | 26 |
1955 |
Wch U20 prel-B | E15 Queen's Indian |
| 2. Portisch vs T Florian |
| 1-0 | 66 |
1955 |
HUN-ch 11th | B53 Sicilian |
| 3. S Schweber vs Portisch |
| 0-1 | 38 |
1955 |
Wch U20 final-A | E41 Nimzo-Indian |
| 4. Portisch vs P Dely |
 | 1-0 | 22 |
1955 |
HUN-ch 11th | A69 Benoni, Four Pawns Attack, Main line |
| 5. Portisch vs J Van Oosterom |
| 1-0 | 38 |
1955 |
Wch U20 final-A | A44 Old Benoni Defense |
| 6. Portisch vs M Donia |
| 1-0 | 54 |
1955 |
Wch U20 prel-B | E30 Nimzo-Indian, Leningrad |
| 7. Portisch vs F Csiszar |
| 1-0 | 48 |
1955 |
Voros Lobogo | D36 Queen's Gambit Declined, Exchange, Positional line, 6.Qc2 |
| 8. Portisch vs V Muller |
| 1-0 | 50 |
1955 |
Wch U20 prel-B | D35 Queen's Gambit Declined |
| 9. K Honfi vs Portisch |
| 0-1 | 41 |
1955 |
HUN-ch 11th | B28 Sicilian, O'Kelly Variation |
| 10. Portisch vs S Johannessen |
| 1-0 | 35 |
1955 |
Wch U20 final-A | B10 Caro-Kann |
| 11. Portisch vs F Koberl |
| 1-0 | 47 |
1955 |
Voros Lobogo | A44 Old Benoni Defense |
| 12. D Keller vs Portisch |
| 0-1 | 48 |
1955 |
Wch U20 final-A | B28 Sicilian, O'Kelly Variation |
| 13. Portisch vs E Gereben |
| 1-0 | 41 |
1955 |
HUN-ch 11th | E89 King's Indian, Samisch, Orthodox Main line |
| 14. Portisch vs K Honfi |
| 1-0 | 27 |
1956 |
Budapest | D32 Queen's Gambit Declined, Tarrasch |
| 15. A Nielsen vs Portisch |
| 0-1 | 63 |
1956 |
Moscow | C01 French, Exchange |
| 16. L Tipary vs Portisch |
| 0-1 | 19 |
1956 |
Budapest | A43 Old Benoni |
| 17. Portisch vs J Pogats |
| 1-0 | 36 |
1956 |
Budapest | A72 Benoni, Classical without 9.O-O |
| 18. Portisch vs A Lotfee |
| 1-0 | 49 |
1956 |
Moscow | E30 Nimzo-Indian, Leningrad |
| 19. L Szollosi Sr vs Portisch |
| 0-1 | 58 |
1956 |
Budapest | C02 French, Advance |
| 20. Portisch vs A Cseh |
| 1-0 | 40 |
1956 |
Debrecen | B26 Sicilian, Closed, 6.Be3 |
| 21. Benko vs Portisch |
| 0-1 | 32 |
1956 |
Budapest | C04 French, Tarrasch, Guimard Main line |
| 22. S Smiltiner vs Portisch |
| 0-1 | 77 |
1956 |
Moskva | A15 English |
| 23. Portisch vs Hacsak Istvan |
| 1-0 | 26 |
1956 |
Debrecen | B27 Sicilian |
| 24. Z Berger vs Portisch |
| 0-1 | 28 |
1956 |
Budapest | C18 French, Winawer |
| 25. Portisch vs D Keller |
| 1-0 | 30 |
1956 |
Moskva | D35 Queen's Gambit Declined |
