| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. A Bisguier vs J Grefe |
| 0-1 | 36 | 1973 | US Championship | A42 Modern Defense, Averbakh System |
| 27. J Grefe vs E Mednis |
 | 1-0 | 89 | 1973 | US Championship | C18 French, Winawer |
| 28. W Martz vs J Grefe |
| 0-1 | 55 | 1973 | US Championship | A46 Queen's Pawn Game |
| 29. J Grefe vs Browne |
| 1-0 | 21 | 1973 | US Championship | B98 Sicilian, Najdorf |
| 30. D Byrne vs J Grefe |
| 0-1 | 33 | 1973 | US Championship | A00 Uncommon Opening |
| 31. J Grefe vs J Tarjan |
| ½-½ | 25 | 1973 | US Championship | B77 Sicilian, Dragon, Yugoslav Attack |
| 32. Kavalek vs J Grefe |
| 1-0 | 40 | 1973 | US Championship | D42 Queen's Gambit Declined, Semi-Tarrasch, 7.Bd3 |
| 33. J Grefe vs Evans |
| ½-½ | 17 | 1973 | US Championship | B81 Sicilian, Scheveningen, Keres Attack |
| 34. Benko vs J Grefe |
| 0-1 | 58 | 1973 | US Championship | A15 English |
| 35. A Phillips vs J Grefe |
| 1-0 | 56 | 1973 | GRE Islington Open | B84 Sicilian, Scheveningen |
| 36. J Grefe vs G Dickson |
| 1-0 | 54 | 1973 | GRE Islington Open | B77 Sicilian, Dragon, Yugoslav Attack |
| 37. J Grefe vs M Yeo |
| 1-0 | 34 | 1973 | GRE Islington Open | C69 Ruy Lopez, Exchange, Gligoric Variation |
| 38. K Petschar vs J Grefe |
| 0-1 | 54 | 1973 | GRE Islington Open | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 39. J Grefe vs Nunn |
| 0-1 | 25 | 1973 | GRE Masters Reserves | B06 Robatsch |
| 40. J Grefe vs B Cafferty |
| 1-0 | 54 | 1973 | GRE Masters Reserves | C19 French, Winawer, Advance |
| 41. J Grefe vs W Heidenfeld |
| 1-0 | 39 | 1973 | GRE Masters Reserves | A07 King's Indian Attack |
| 42. J Grefe vs A Bisguier |
| 1-0 | 45 | 1974 | Lone Pine | A28 English |
| 43. Browne vs J Grefe |
| 1-0 | 38 | 1974 | Lone Pine | B45 Sicilian, Taimanov |
| 44. J Grefe vs Browne |
| 0-1 | 41 | 1974 | United States Championship | B99 Sicilian, Najdorf, 7...Be7 Main line |
| 45. A Bisguier vs J Grefe |
| ½-½ | 30 | 1974 | United States Championship | B06 Robatsch |
| 46. J Grefe vs Benko |
| ½-½ | 13 | 1974 | United States Championship | C42 Petrov Defense |
| 47. Evans vs J Grefe |
| ½-½ | 29 | 1974 | United States Championship | E99 King's Indian, Orthodox, Taimanov |
| 48. J Grefe vs N Weinstein |
| 1-0 | 41 | 1974 | United States Championship | C91 Ruy Lopez, Closed |
| 49. K Commons vs J Grefe |
| 0-1 | 53 | 1974 | United States Championship | E97 King's Indian |
| 50. J Grefe vs B Zuckerman |
| ½-½ | 10 | 1974 | United States Championship | B92 Sicilian, Najdorf, Opocensky Variation |
Kibitzing
