| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Book vs M Rantanen |
| 1-0 | 33 |
1946 |
Helsinki | C05 French, Tarrasch |
| 2. Z Nilsson vs M Rantanen |
| ½-½ | 57 |
1948 |
Saltsjobaden tt | D52 Queen's Gambit Declined |
| 3. M Rantanen vs C Rivera |
| ½-½ | 34 |
1954 |
Amsterdam ol (Men) | E41 Nimzo-Indian |
| 4. M Rantanen vs G P Thibaut |
| 1-0 | 72 |
1954 |
Amsterdam ol (Men) | E72 King's Indian |
| 5. Ugo Cala vs M Rantanen |
| ½-½ | 60 |
1954 |
Amsterdam ol (Men) | A30 English, Symmetrical |
| 6. W Nash vs M Rantanen |
| 0-1 | 29 |
1954 |
Amsterdam ol (Men) | C07 French, Tarrasch |
| 7. M Rantanen vs I Johannsson |
| 0-1 | 24 |
1954 |
Amsterdam ol (Men) | E90 King's Indian |
| 8. M Rantanen vs M Fox |
| 1-0 | 88 |
1954 |
Amsterdam ol (Men) | A49 King's Indian, Fianchetto without c4 |
| 9. M Rantanen vs E Weichselbaumer |
| 1-0 | 39 |
1954 |
Amsterdam ol (Men) | E17 Queen's Indian |
| 10. W Ramm vs M Rantanen |
| 0-1 | 69 |
1954 |
Amsterdam ol (Men) | D45 Queen's Gambit Declined Semi-Slav |
| 11. M Rantanen vs Kovacs |
| 0-1 | 74 |
1954 |
Amsterdam olm | E74 King's Indian, Averbakh, 6...c5 |
| 12. S Burstein vs M Rantanen |
| 1-0 | 40 |
1954 |
Amsterdam ol (Men) | C07 French, Tarrasch |
| 13. Z Kovacs vs M Rantanen |
| 1-0 | 66 |
1954 |
Amsterdam ol (Men) | D51 Queen's Gambit Declined |
| 14. M Rantanen vs K Darga |
| ½-½ | 34 |
1956 |
Moscow ol (Men) prel | E10 Queen's Pawn Game |
| 15. J Penrose vs M Rantanen |
| 1-0 | 35 |
1956 |
Olympiad | B84 Sicilian, Scheveningen |
| 16. F R Anderson vs M Rantanen |
| 1-0 | 75 |
1958 |
13th olm final B | B63 Sicilian, Richter-Rauzer Attack |
| 17. M Rantanen vs K Kirby |
| 0-1 | 44 |
1958 |
13th olm qual. group 2 | D34 Queen's Gambit Declined, Tarrasch |
| 18. M Rantanen vs Z Nilsson |
| ½-½ | 47 |
1958 |
13th olm final B | A88 Dutch, Leningrad, Main Variation with c6 |
| 19. M Rantanen vs B Andersen |
| 0-1 | 26 |
1958 |
13th olm final B | E46 Nimzo-Indian |
| 20. M Rantanen vs S Smiltiner |
 | 1-0 | 87 |
1958 |
13th olm qual. group 2 | E43 Nimzo-Indian, Fischer Variation |
| 21. M Rantanen vs G Barcza |
| ½-½ | 38 |
1958 |
13th olm final B | E50 Nimzo-Indian, 4.e3 O-O 5.Nf3, without ...d5 |
| 22. S Smiltiner vs M Rantanen |
| 1-0 | 43 |
1958 |
13th olm final B | A14 English |
| 23. A Vestol vs M Rantanen |
| 1-0 | 41 |
1958 |
13th olm qual. group 2 | A04 Reti Opening |
| 24. M Rantanen vs Schmid |
| ½-½ | 54 |
1958 |
Munich ol (Men) prel | B21 Sicilian, 2.f4 and 2.d4 |
| 25. M Rantanen vs Prins |
| ½-½ | 41 |
1958 |
13th olm final B | E00 Queen's Pawn Game |