Game |
| Result | Moves |
Year | Event/Locale | Opening |
1. I Johannsson vs Z Kovacs |
| 1-0 | 38 | 1954 | Amsterdam Olympiad qual-1 | E69 King's Indian, Fianchetto, Classical Main line |
2. M Rantanen vs I Johannsson |
| 0-1 | 24 | 1954 | Amsterdam Olympiad qual-1 | E90 King's Indian |
3. I Johannsson vs P Papapavlou |
| ½-½ | 20 | 1954 | Amsterdam Olympiad qual-1 | D51 Queen's Gambit Declined |
4. Kotov vs I Johannsson |
 | 1-0 | 29 | 1954 | Amsterdam Olympiad qual-1 | E72 King's Indian |
5. P H Clarke vs I Johannsson |
 | 1-0 | 40 | 1954 | Amsterdam Olympiad Final-A | B93 Sicilian, Najdorf, 6.f4 |
6. E Gereben vs I Johannsson |
| 1-0 | 39 | 1954 | Amsterdam Olympiad Final-A | E66 King's Indian, Fianchetto, Yugoslav Panno |
7. I Johannsson vs R Bobekov |
 | 0-1 | 41 | 1954 | Amsterdam Olympiad Final-A | B93 Sicilian, Najdorf, 6.f4 |
8. I Johannsson vs Geller |
| 0-1 | 73 | 1954 | Amsterdam Olympiad Final-A | E87 King's Indian, Samisch, Orthodox |
9. I Johannsson vs A Fuderer |
| ½-½ | 34 | 1954 | Amsterdam Olympiad Final-A | A43 Old Benoni |
10. E Joppen vs I Johannsson |
| 1-0 | 46 | 1954 | Amsterdam Olympiad Final-A | C73 Ruy Lopez, Modern Steinitz Defense |
11. F Zita vs I Johannsson |
| ½-½ | 105 | 1954 | Amsterdam Olympiad Final-A | D27 Queen's Gambit Accepted, Classical |
12. H Kramer vs I Johannsson |
| ½-½ | 20 | 1954 | Amsterdam Olympiad Final-A | C90 Ruy Lopez, Closed |
13. I Johannsson vs Z Nilsson |
 | 0-1 | 23 | 1954 | Amsterdam Olympiad Final-A | D47 Queen's Gambit Declined Semi-Slav |
14. I Johannsson vs F Olafsson |
| ½-½ | 20 | 1955 | Nordic Championship | C48 Four Knights |
15. S Schweber vs I Johannsson |
| ½-½ | 41 | 1955 | Wch U20 prel-B | C84 Ruy Lopez, Closed |
16. I Johannsson vs Portisch |
 | 0-1 | 26 | 1955 | Wch U20 prel-B | E15 Queen's Indian |
17. I Johannsson vs G Tringov |
| ½-½ | 28 | 1955 | Wch U20 prel-B | E69 King's Indian, Fianchetto, Classical Main line |
18. I Johannsson vs Larsen |
 | 0-1 | 25 | 1955 | Nordic Championship | E02 Catalan, Open, 5.Qa4 |
19. I Johannsson vs A Hildebrand |
| 1-0 | 16 | 1955 | Nordic Championship | B36 Sicilian, Accelerated Fianchetto |
20. R Fuchs vs I Johannsson |
| ½-½ | 23 | 1956 | Copenhagen | A16 English |
21. H Bouwmeester vs I Johannsson |
| 0-1 | 37 | 1956 | Copenhagen | E33 Nimzo-Indian, Classical |
22. I Johannsson vs J Enevoldsen |
| 0-1 | 50 | 1956 | Copenhagen | A15 English |
23. Larsen vs I Johannsson |
| 1-0 | 43 | 1956 | Copenhagen | E66 King's Indian, Fianchetto, Yugoslav Panno |
24. I Johannsson vs F Roessel |
| ½-½ | 31 | 1956 | Copenhagen | A96 Dutch, Classical Variation |
25. D Bertholdt vs I Johannsson |
| 1-0 | 54 | 1956 | Copenhagen | A70 Benoni, Classical with 7.Nf3 |