| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Rellstab vs G Pfeiffer |
| 0-1 | 47 |
1941 |
GER-ch | B13 Caro-Kann, Exchange |
| 2. K Gumprich vs G Pfeiffer |
| 0-1 | 37 |
1949 |
Bad Pyrmont ch-BRD | B10 Caro-Kann |
| 3. B Kostic vs G Pfeiffer |
| ½-½ | 63 |
1950 |
Bled it | B12 Caro-Kann Defense |
| 4. O'Kelly vs G Pfeiffer |
| ½-½ | 46 |
1950 |
Bled (Slovenia) | B18 Caro-Kann, Classical |
| 5. Letelier vs G Pfeiffer |
| ½-½ | 61 |
1950 |
Dubrovnik olm | B14 Caro-Kann, Panov-Botvinnik Attack |
| 6. Stoltz vs G Pfeiffer |
| ½-½ | 18 |
1950 |
Bled it | B12 Caro-Kann Defense |
| 7. Pilnik vs G Pfeiffer |
| 1-0 | 40 |
1950 |
Bled it | B17 Caro-Kann, Steinitz Variation |
| 8. Schmid vs G Pfeiffer |
| 1-0 | 40 |
1951 |
GER-ch 14th | B10 Caro-Kann |
| 9. J Penrose vs G Pfeiffer |
| 1-0 | 57 |
1952 |
Helsinki ol (Men) | B17 Caro-Kann, Steinitz Variation |
| 10. K Darga vs G Pfeiffer |
| 1-0 | 41 |
1955 |
FRG-ch 03rd | B10 Caro-Kann |
| 11. M Eisinger vs G Pfeiffer |
| 1-0 | 62 |
1957 |
Bad Neuenahr | B15 Caro-Kann |
| 12. P Clarke vs G Pfeiffer |
| ½-½ | 26 |
1958 |
13th olm final A | B17 Caro-Kann, Steinitz Variation |
| 13. Rossolimo vs G Pfeiffer |
| ½-½ | 20 |
1958 |
13th olm final A | B13 Caro-Kann, Exchange |
| 14. E Bhend vs G Pfeiffer |
| 0-1 | 60 |
1958 |
13th olm final A | B14 Caro-Kann, Panov-Botvinnik Attack |
| 15. Keres vs G Pfeiffer |
| 1-0 | 33 |
1960 |
Hamburg FRG-SU (29.07.60) | B14 Caro-Kann, Panov-Botvinnik Attack |
| 16. K Darga vs G Pfeiffer |
| 1-0 | 37 |
1961 |
FRG-ch 06th | B10 Caro-Kann |
| 17. Matulovic vs G Pfeiffer |
 | 0-1 | 41 |
1961 |
EU-chT (Men) | B14 Caro-Kann, Panov-Botvinnik Attack |
