| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Portisch vs Larsen |
 | 1-0 | 79 |
1959 |
Alekhine mem | A53 Old Indian |
| 2. Portisch vs Larsen |
| 1-0 | 31 |
1963 |
Halle | E46 Nimzo-Indian |
| 3. Larsen vs Portisch |
 | 1-0 | 33 |
1964 |
Amsterdam Interzonal | C01 French, Exchange |
| 4. Larsen vs Portisch |
| ½-½ | 41 |
1964 |
Hoogovens | A02 Bird's Opening |
| 5. Portisch vs Larsen |
| 1-0 | 58 |
1965 |
Zagreb | A97 Dutch, Ilyin-Genevsky |
| 6. Larsen vs Portisch |
 | 1-0 | 53 |
1966 |
Second Piatigorsky Cup | C23 Bishop's Opening |
| 7. Larsen vs Portisch |
 | 0-1 | 23 |
1966 |
La Habana ol (Men) fin-A | E05 Catalan, Open, Classical line |
| 8. Portisch vs Larsen |
| ½-½ | 32 |
1966 |
Second Piatigorsky Cup | A30 English, Symmetrical |
| 9. Larsen vs Portisch |
 | 1-0 | 55 |
1967 |
Palma de Mallorca | D31 Queen's Gambit Declined |
| 10. Portisch vs Larsen |
 | 1-0 | 43 |
1967 |
Sousse Interzonal | A41 Queen's Pawn Game (with ...d6) |
| 11. Larsen vs Portisch |
 | 1-0 | 41 |
1968 |
Porec | D59 Queen's Gambit Declined, Tartakower |
| 12. Portisch vs Larsen |
| 1-0 | 57 |
1968 |
Porec | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 13. Portisch vs Larsen |
| 1-0 | 39 |
1968 |
Lugano | B39 Sicilian, Accelerated Fianchetto, Breyer Variation |
| 14. Larsen vs Portisch |
| 0-1 | 39 |
1968 |
Porec | D61 Queen's Gambit Declined, Orthodox, Rubinstein Attack |
| 15. Portisch vs Larsen |
| ½-½ | 34 |
1968 |
Porec | D47 Queen's Gambit Declined Semi-Slav |
| 16. Portisch vs Larsen |
| 0-1 | 41 |
1968 |
Porec | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 17. Larsen vs Portisch |
 | ½-½ | 63 |
1968 |
Porec | C28 Vienna Game |
| 18. Larsen vs Portisch |
| ½-½ | 31 |
1968 |
Porec | D59 Queen's Gambit Declined, Tartakower |
| 19. Portisch vs Larsen |
| ½-½ | 78 |
1968 |
Porec | D43 Queen's Gambit Declined Semi-Slav |
| 20. Larsen vs Portisch |
| ½-½ | 23 |
1968 |
Monte Carlo | E05 Catalan, Open, Classical line |
| 21. Portisch vs Larsen |
| ½-½ | 41 |
1968 |
Porec | E56 Nimzo-Indian, 4.e3, Main line with 7...Nc6 |
| 22. Larsen vs Portisch |
 | 1-0 | 28 |
1968 |
Porec | C28 Vienna Game |
| 23. Larsen vs Portisch |
| ½-½ | 85 |
1970 |
Palma de Mallorca Interzonal | A09 Reti Opening |
| 24. Larsen vs Portisch |
 | 0-1 | 22 |
1970 |
Siegen | A01 Nimzovich-Larsen Attack |
| 25. Portisch vs Larsen |
| 1-0 | 43 |
1971 |
Palma de Mallorca | A17 English |