| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. J Sumar vs K S Ojanen |
| 1-0 | 53 |
1950 |
Dubrovnik olm | A91 Dutch Defense |
| 2. J Sumar vs Shainswit |
| ½-½ | 61 |
1950 |
Dubrovnik olm | A07 King's Indian Attack |
| 3. J Sumar vs I Johansson |
| 0-1 | 53 |
1950 |
Dubrovnik olm | D37 Queen's Gambit Declined |
| 4. A Dunkelblum vs J Sumar |
| 1-0 | 29 |
1950 |
Dubrovnik olm | D02 Queen's Pawn Game |
| 5. H Busek vs J Sumar |
| 1-0 | 76 |
1950 |
Dubrovnik olm | A49 King's Indian, Fianchetto without c4 |
| 6. Pirc vs J Sumar |
| 1-0 | 48 |
1950 |
Dubrovnik olm | D68 Queen's Gambit Declined, Orthodox Defense, Classical |
| 7. J Sumar vs E Pedersen |
| 0-1 | 42 |
1950 |
Dubrovnik olm | E91 King's Indian |
| 8. R Flores-Alvarez vs J Sumar |
| 1-0 | 52 |
1950 |
Dubrovnik olm | C81 Ruy Lopez, Open, Howell Attack |
| 9. J Sumar vs A Vestol |
| 1-0 | 37 |
1950 |
Dubrovnik olm | E24 Nimzo-Indian, Samisch |
| 10. J Sumar vs V Nestler |
| 0-1 | 38 |
1950 |
Dubrovnik olm | B20 Sicilian |
| 11. Guimard vs J Sumar |
| 1-0 | 66 |
1950 |
Dubrovnik olm | A46 Queen's Pawn Game |
| 12. J Sumar vs Rossolimo |
| 0-1 | 35 |
1950 |
Dubrovnik olm | A14 English |
| 13. Schmid vs J Sumar |
| 1-0 | 37 |
1950 |
Dubrovnik olm | B63 Sicilian, Richter-Rauzer Attack |
| 14. Cortlever vs J Sumar |
| 1-0 | 37 |
1950 |
Dubrovnik olm | B54 Sicilian |
| 15. A Zografakis vs J Sumar |
| 1-0 | 41 |
1950 |
Dubrovnik olm | D48 Queen's Gambit Declined Semi-Slav, Meran |
| 16. J Sumar vs A Liebstein |
| 1-0 | 35 |
1951 |
Mar del Plata zt | C53 Giuoco Piano |
| 17. J Sumar vs E Eliskases |
| 0-1 | 28 |
1951 |
Mar del Plata zt ,MCL 03 | B72 Sicilian, Dragon |
| 18. J Sumar vs L Marini |
| 0-1 | 40 |
1951 |
Mar del Plata zt | E49 Nimzo-Indian, 4.e3, Botvinnik System |
| 19. Julio Bolbochan vs J Sumar |
| 1-0 | 41 |
1951 |
Mar del Plata (Argentina) | D06 Queen's Gambit Declined |
| 20. J Sumar vs C H Maderna |
| 0-1 | 39 |
1951 |
Mar del Plata zt | D45 Queen's Gambit Declined Semi-Slav |
| 21. J Sumar vs P Martin |
| ½-½ | 90 |
1951 |
Mar del Plata zt | D27 Queen's Gambit Accepted, Classical |
| 22. J Sumar vs Letelier |
| 1-0 | 43 |
1951 |
Mar del Plata zt | D55 Queen's Gambit Declined |
| 23. J Sumar vs H Rossetto |
| ½-½ | 40 |
1951 |
Mar del Plata zt | D98 Grunfeld, Russian |
| 24. J Sumar vs F Vasconcellos |
| 1-0 | 66 |
1951 |
Mar del Plata zt | E43 Nimzo-Indian, Fischer Variation |
| 25. Larsen vs J Sumar |
| ½-½ | 40 |
1958 |
Mar del Plata | D53 Queen's Gambit Declined |