| 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 Kovacs |
| 0-1 | 74 |
1954 |
Amsterdam olm | E74 King's Indian, Averbakh, 6...c5 |
| 4. M Rantanen vs K Darga |
| ½-½ | 34 |
1956 |
Moscow ol (Men) prel | E10 Queen's Pawn Game |
| 5. J Penrose vs M Rantanen |
| 1-0 | 35 |
1956 |
Olympiad | B84 Sicilian, Scheveningen |
| 6. M Rantanen vs Bisguier |
| ½-½ | 61 |
1958 |
13th olm qual. group 2 | D27 Queen's Gambit Accepted, Classical |
| 7. M Rantanen vs Schmid |
| ½-½ | 54 |
1958 |
Munich ol (Men) prel | B21 Sicilian, 2.f4 and 2.d4 |
| 8. H Van de Broeck vs M Rantanen |
| ½-½ | 19 |
1958 |
13th olm final B | D38 Queen's Gambit Declined, Ragozin Variation |
| 9. M Mallofre vs M Rantanen |
| 1-0 | 50 |
1958 |
13th olm qual. group 2 | B88 Sicilian, Fischer-Sozin Attack |
| 10. M Rantanen vs K Kirby |
| 0-1 | 44 |
1958 |
13th olm qual. group 2 | D34 Queen's Gambit Declined, Tarrasch |
| 11. F R Anderson vs M Rantanen |
| 1-0 | 75 |
1958 |
13th olm final B | B63 Sicilian, Richter-Rauzer Attack |
| 12. M Rantanen vs Z Nilsson |
| ½-½ | 47 |
1958 |
13th olm final B | A88 Dutch, Leningrad, Main Variation with c6 |
| 13. M Rantanen vs S Smiltiner |
 | 1-0 | 87 |
1958 |
13th olm qual. group 2 | E43 Nimzo-Indian, Fischer Variation |
| 14. M Rantanen vs B Andersen |
| 0-1 | 26 |
1958 |
13th olm final B | E46 Nimzo-Indian |
| 15. M Rantanen vs G Barcza |
| ½-½ | 38 |
1958 |
13th olm final B | E50 Nimzo-Indian, 4.e3 O-O 5.Nf3, without ...d5 |
| 16. A Vestoel vs M Rantanen |
| 1-0 | 41 |
1958 |
13th olm qual. group 2 | A05 Reti Opening |
| 17. S Smiltiner vs M Rantanen |
| 1-0 | 43 |
1958 |
13th olm final B | A14 English |
| 18. M Rantanen vs Prins |
| ½-½ | 41 |
1958 |
13th olm final B | E00 Queen's Pawn Game |
| 19. M Rantanen vs K Darga |
| ½-½ | 28 |
1960 |
EU-Cup Gr2 | E63 King's Indian, Fianchetto, Panno Variation |
| 20. K Darga vs M Rantanen |
| ½-½ | 32 |
1960 |
EU-Cup Gr2 | A17 English |
| 21. M Rantanen vs Hort |
| ½-½ | 38 |
1962 |
Varna | E68 King's Indian, Fianchetto, Classical Variation, 8.e4 |
| 22. Keene vs M Rantanen |
  | 1-0 | 42 |
1966 |
British Chess Federation v Finland | E55 Nimzo-Indian, 4.e3, Gligoric System, Bronstein Variation |
| 23. M Rantanen vs Sliwa |
| 1-0 | 52 |
1966 |
La Habana ol (Men) fin-B | E16 Queen's Indian |