| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 51. Mackenzie vs C Stanley |
| 0-1 | 23 | 1866 | New York CC Tournament | C01 French, Exchange |
| 52. C Stanley vs Mackenzie |
| 0-1 | 29 | 1866 | New York CC Tournament | B45 Sicilian, Taimanov |
| 53. Mackenzie vs J Barnett |
| 1-0 | 23 | 1866 | New York CC Tournament | C42 Petrov Defense |
| 54. J Barnett vs Mackenzie |
| 0-1 | 30 | 1866 | New York CC Tournament | C65 Ruy Lopez, Berlin Defense |
| 55. Mackenzie vs J Thompson |
| 1-0 | 30 | 1866 | New York CC Tournament | C01 French, Exchange |
| 56. Mackenzie vs G Reichhelm |
 | ½-½ | 53 | 1866 | Mackenzie - Reichhelm 1st US Championship Match | C78 Ruy Lopez |
| 57. G Reichhelm vs Mackenzie |
| 0-1 | 55 | 1866 | Mackenzie - Reichhelm 1st US Championship Match | C51 Evans Gambit |
| 58. Mackenzie vs G Reichhelm |
| 1-0 | 31 | 1866 | Mackenzie - Reichhelm 1st US Championship Match | C67 Ruy Lopez |
| 59. G Reichhelm vs Mackenzie |
| 0-1 | 25 | 1866 | Mackenzie - Reichhelm 1st US Championship Match | C77 Ruy Lopez |
| 60. G Reichhelm vs Mackenzie |
| 0-1 | 49 | 1866 | Mackenzie - Reichhelm 1st US Championship Match | C51 Evans Gambit |
| 61. Mackenzie vs G Reichhelm |
| 1-0 | 26 | 1866 | Mackenzie - Reichhelm 1st US Championship Match | C67 Ruy Lopez |
| 62. E Delmar vs Mackenzie |
| 0-1 | 64 | 1867 | New York Chess Club Championship | C77 Ruy Lopez |
| 63. Mackenzie vs C Stanley |
| 0-1 | 24 | 1867 | Exhibition Match | C44 King's Pawn Game |
| 64. C Stanley vs Mackenzie |
| 0-1 | 38 | 1867 | Match | C33 King's Gambit Accepted |
| 65. Mackenzie vs C Stanley |
| 1-0 | 19 | 1867 | Match | C51 Evans Gambit |
| 66. Mackenzie vs G Reichhelm |
 | 1-0 | 29 | 1867 | Mackenzie - Reichhelm 2nd US Championship Match | C10 French |
| 67. G Reichhelm vs Mackenzie |
| 0-1 | 37 | 1867 | Mackenzie - Reichhelm 2nd US Championship Match | C68 Ruy Lopez, Exchange |
| 68. Mackenzie vs G Reichhelm |
| 1-0 | 32 | 1867 | Mackenzie - Reichhelm 2nd US Championship Match | C01 French, Exchange |
| 69. G Reichhelm vs Mackenzie |
| ½-½ | 29 | 1867 | Mackenzie - Reichhelm 2nd US Championship Match | C51 Evans Gambit |
| 70. Mackenzie vs G Reichhelm |
| 1-0 | 47 | 1867 | Mackenzie - Reichhelm 2nd US Championship Match | C15 French, Winawer |
| 71. G Reichhelm vs Mackenzie |
| 0-1 | 55 | 1867 | Mackenzie - Reichhelm 2nd US Championship Match | C51 Evans Gambit |
| 72. Mackenzie vs G Reichhelm |
| ½-½ | 34 | 1867 | Mackenzie - Reichhelm 2nd US Championship Match | C70 Ruy Lopez |
| 73. F Perrin vs Mackenzie |
| 0-1 | 21 | 1867 | Casual game | C58 Two Knights |
| 74. G Reichhelm vs Mackenzie |
| 0-1 | 24 | 1867 | Mackenzie - Reichhelm 2nd US Championship Match | C45 Scotch Game |
| 75. Mackenzie vs G Reichhelm |
| 1-0 | 29 | 1867 | Mackenzie - Reichhelm 2nd US Championship Match | C78 Ruy Lopez |
Kibitzing
