| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Szabo vs Portisch |
 | 1-0 | 40 |
1955 |
HUN ch | E11 Bogo-Indian Defense |
| 2. Portisch vs T Florian |
| 1-0 | 66 |
1955 |
HUN-ch 11th | B53 Sicilian |
| 3. Portisch vs J Van Oosterom |
| 1-0 | 38 |
1955 |
Wch U20 final-A | A44 Old Benoni Defense |
| 4. Portisch vs F Csiszar |
| 1-0 | 48 |
1955 |
Voros Lobogo | D36 Queen's Gambit Declined, Exchange, Positional line, 6.Qc2 |
| 5. Portisch vs P Dely |
| 1-0 | 22 |
1955 |
HUN-ch 11th | A69 Benoni, Four Pawns Attack, Main line |
| 6. Portisch vs V Muller |
| 1-0 | 50 |
1955 |
Wch U20 prel-B | D35 Queen's Gambit Declined |
| 7. Portisch vs F Koberl |
| 1-0 | 47 |
1955 |
Voros Lobogo | A44 Old Benoni Defense |
| 8. S Schweber vs Portisch |
| 1-0 | 54 |
1955 |
Wch U20 prel-B | E41 Nimzo-Indian |
| 9. M Farre vs Portisch |
| 1-0 | 60 |
1955 |
Wch U20 final-A | E62 King's Indian, Fianchetto |
| 10. M Bely vs Portisch |
| 1-0 | 63 |
1955 |
HUN-ch 11th | C45 Scotch Game |
| 11. Portisch vs M Donia |
| 1-0 | 54 |
1955 |
Wch U20 prel-B | E30 Nimzo-Indian, Leningrad |
| 12. Spassky vs Portisch |
| 1-0 | 36 |
1955 |
Wch U20 final-A | E30 Nimzo-Indian, Leningrad |
| 13. Portisch vs E Gereben |
| 1-0 | 41 |
1955 |
HUN-ch 11th | E89 King's Indian, Samisch, Orthodox Main line |
| 14. Portisch vs S Johannessen |
| 1-0 | 35 |
1955 |
Wch U20 final-A | B10 Caro-Kann |
| 15. Portisch vs D Keller |
| 1-0 | 30 |
1956 |
Moskva | D35 Queen's Gambit Declined |
| 16. C Szekely vs Portisch |
| 1-0 | 37 |
1956 |
Debrecen | D78 Neo-Grunfeld, 6.O-O c6 |
| 17. Portisch vs A Lotfee |
| 1-0 | 49 |
1956 |
Moscow | E30 Nimzo-Indian, Leningrad |
| 18. I Molnar vs Portisch |
| 1-0 | 24 |
1956 |
Budapest | E00 Queen's Pawn Game |
| 19. A Vajda vs Portisch |
| 1-0 | 34 |
1956 |
Debrecen | C45 Scotch Game |
| 20. Portisch vs K Honfi |
| 1-0 | 27 |
1956 |
Budapest | D32 Queen's Gambit Declined, Tarrasch |
| 21. Portisch vs A Cseh |
| 1-0 | 40 |
1956 |
Debrecen | B26 Sicilian, Closed, 6.Be3 |
| 22. Portisch vs J Pogats |
| 1-0 | 36 |
1956 |
Budapest | A72 Benoni, Classical without 9.O-O |
| 23. Portisch vs Hacsak Istvan |
| 1-0 | 26 |
1956 |
Debrecen | B27 Sicilian |
| 24. F Koberl vs Portisch |
| 1-0 | 77 |
1957 |
HUN-ch 12th | A10 English |
| 25. Portisch vs O Yepez |
| 1-0 | 42 |
1957 |
WchT U26 04th | A66 Benoni |
