| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. G MacDonnell vs Mackenzie |
  | 1-0 | 49 | 1862 | MacDonnell - Mackenzie 1862/63 | C50 Giuoco Piano |
| 27. Mackenzie vs G MacDonnell |
| 1-0 | 47 | 1862 | MacDonnell - Mackenzie 1862/63 | C41 Philidor Defense |
| 28. Mackenzie vs G MacDonnell |
| 0-1 | 64 | 1862 | MacDonnell - Mackenzie 1862/63 | C41 Philidor Defense |
| 29. G MacDonnell vs Mackenzie |
| 0-1 | 28 | 1862 | MacDonnell - Mackenzie 1862/63 | C42 Petrov Defense |
| 30. G MacDonnell vs Mackenzie |
| 1-0 | 47 | 1862 | MacDonnell - Mackenzie 1862/63 | C50 Giuoco Piano |
| 31. Mackenzie vs G MacDonnell |
| 1-0 | 47 | 1862 | MacDonnell - Mackenzie 1862/63 | C41 Philidor Defense |
| 32. Mackenzie vs G MacDonnell |
| 1-0 | 48 | 1862 | MacDonnell - Mackenzie 1862/63 | A00 Uncommon Opening |
| 33. G MacDonnell vs Mackenzie |
| 0-1 | 27 | 1862 | MacDonnell - Mackenzie 1862/63 | C01 French, Exchange |
| 34. A Zerega vs Mackenzie |
| 0-1 | 20 | 1863 | New York Chess Club | C58 Two Knights |
| 35. Mackenzie vs NN |
| 1-0 | 22 | 1863 | Casual game | C51 Evans Gambit |
| 36. G MacDonnell vs Mackenzie |
| ½-½ | 37 | 1863 | MacDonnell - Mackenzie 1862/63 | A10 English |
| 37. Mackenzie vs G MacDonnell |
| 1-0 | 36 | 1863 | MacDonnell - Mackenzie 1862/63 | A00 Uncommon Opening |
| 38. H Lindehn vs Mackenzie |
| 0-1 | 20 | 1864 | London | C21 Center Game |
| 39. A Zerega vs Mackenzie |
| 0-1 | 26 | 1864 | Casual game | A00 Uncommon Opening |
| 40. Mackenzie vs G Hammond |
| 1-0 | 22 | 1864 | USA | C42 Petrov Defense |
| 41. J Thompson vs Mackenzie |
| 0-1 | 14 | 1864 | Casual game | C37 King's Gambit Accepted |
| 42. G Reichhelm vs Mackenzie |
| 1-0 | 30 | 1864 | Philadelphia Chess Club, Casual game | C51 Evans Gambit |
| 43. Mackenzie vs G Reichhelm |
| 1-0 | 36 | 1865 | Match | C33 King's Gambit Accepted |
| 44. G Reichhelm vs Mackenzie |
| 1-0 | 29 | 1865 | Philadelphia | C51 Evans Gambit |
| 45. Mackenzie vs Bird |
| 0-1 | 39 | 1865 | Casual game | C51 Evans Gambit |
| 46. Mackenzie vs F Perrin |
| 1-0 | 12 | 1866 | New York | C41 Philidor Defense |
| 47. Mackenzie vs J Barnett |
| 1-0 | 23 | 1866 | New York CC 1st Post War Tournament | C42 Petrov Defense |
| 48. C Stanley vs Mackenzie |
| 0-1 | 29 | 1866 | New York CC 1st Post War Tournament | B45 Sicilian, Taimanov |
| 49. C Stanley vs Mackenzie |
| ½-½ | 39 | 1866 | New York CC 1st Post War Tournament | B20 Sicilian |
| 50. Mackenzie vs C Stanley |
| 0-1 | 24 | 1866 | New York CC 1st Post War Tournament | C01 French, Exchange |
Kibitzing
