| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. Niephaus vs G Pfeiffer |
 | 0-1 | 45 | 1949 | Bad Pyrmont ch-BRD | D50 Queen's Gambit Declined |
| 27. G Pfeiffer vs M Eisinger |
| 1-0 | 48 | 1949 | GER-ch | D95 Grunfeld |
| 28. M Eisinger vs G Pfeiffer |
| 0-1 | 26 | 1950 | FRG-ch 01st | B10 Caro-Kann |
| 29. G Pfeiffer vs P Trifunovic |
| ½-½ | 31 | 1950 | Dubrovnik Olympiad | B07 Pirc |
| 30. I Johansson vs G Pfeiffer |
| 0-1 | 29 | 1950 | Dubrovnik Olympiad | A06 Reti Opening |
| 31. G Pfeiffer vs P Panagopoulos |
| 1-0 | 34 | 1950 | Dubrovnik Olympiad | C14 French, Classical |
| 32. G Pfeiffer vs C Hugot |
| 1-0 | 54 | 1950 | Dubrovnik Olympiad | C14 French, Classical |
| 33. G Pfeiffer vs H Mueller |
| ½-½ | 22 | 1950 | Dubrovnik Olympiad | A46 Queen's Pawn Game |
| 34. Shainswit vs G Pfeiffer |
| 1-0 | 42 | 1950 | Dubrovnik Olympiad | E01 Catalan, Closed |
| 35. G Pfeiffer vs N Cortlever |
| ½-½ | 27 | 1950 | Dubrovnik Olympiad | C77 Ruy Lopez |
| 36. G Pfeiffer vs C Guimard |
| 1-0 | 73 | 1950 | Dubrovnik Olympiad | C14 French, Classical |
| 37. M Kupferstich vs G Pfeiffer |
| ½-½ | 40 | 1950 | Dubrovnik Olympiad | D01 Richter-Veresov Attack |
| 38. A Dunkelblum vs G Pfeiffer |
| ½-½ | 16 | 1950 | Dubrovnik Olympiad | E01 Catalan, Closed |
| 39. Letelier vs G Pfeiffer |
 | ½-½ | 61 | 1950 | Dubrovnik Olympiad | B14 Caro-Kann, Panov-Botvinnik Attack |
| 40. G Pfeiffer vs Tartakower |
| ½-½ | 34 | 1950 | Bled | A46 Queen's Pawn Game |
| 41. Pirc vs G Pfeiffer |
| 1-0 | 41 | 1950 | Bled | A06 Reti Opening |
| 42. G Pfeiffer vs M Vidmar Jr |
| 1-0 | 37 | 1950 | Bled | B05 Alekhine's Defense, Modern |
| 43. G Pfeiffer vs S Puc |
| 1-0 | 71 | 1950 | Bled | C75 Ruy Lopez, Modern Steinitz Defense |
| 44. Kostic vs G Pfeiffer |
| ½-½ | 63 | 1950 | Bled | B12 Caro-Kann Defense |
| 45. G Pfeiffer vs Ivkov |
| ½-½ | 46 | 1950 | Bled | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 46. O'Kelly vs G Pfeiffer |
| ½-½ | 46 | 1950 | Bled | B18 Caro-Kann, Classical |
| 47. G Pfeiffer vs B Milic |
| ½-½ | 73 | 1950 | Bled | C77 Ruy Lopez |
| 48. L Rellstab vs G Pfeiffer |
| ½-½ | 30 | 1950 | Bled | E19 Queen's Indian, Old Main line, 9.Qxc3 |
| 49. G Pfeiffer vs A Matanovic |
| 1-0 | 59 | 1950 | Bled | B10 Caro-Kann |
| 50. Pilnik vs G Pfeiffer |
| 1-0 | 40 | 1950 | Bled | B17 Caro-Kann, Steinitz Variation |
Kibitzing
