| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 26. Leonhardt vs Taubenhaus |
 | ½-½ | 30 |
1905 |
Ostend | C24 Bishop's Opening |
| 27. Leonhardt vs Teichmann |
| 0-1 | 31 |
1905 |
Ostende | C67 Ruy Lopez |
| 28. Schlechter vs Leonhardt |
 | 1-0 | 40 |
1905 |
Ostend | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 29. Leonhardt vs Burn |
 | 0-1 | 34 |
1905 |
Barmen Masters A, GER | C11 French |
| 30. Leonhardt vs Chigorin |
| 1-0 | 32 |
1905 |
Ostende | D07 Queen's Gambit Declined, Chigorin Defense |
| 31. G Schories vs Leonhardt |
| ½-½ | 56 |
1905 |
Scheveningen | C67 Ruy Lopez |
| 32. Alapin vs Leonhardt |
| 0-1 | 32 |
1905 |
Ostend | C20 King's Pawn Game |
| 33. Leonhardt vs G Marco |
| 0-1 | 37 |
1905 |
Ostend | C26 Vienna |
| 34. Janowski vs Leonhardt |
 | 1-0 | 29 |
1905 |
Barmen Masters A, GER | C25 Vienna |
| 35. Blackburne vs Leonhardt |
 | 1-0 | 21 |
1905 |
Ostend | D02 Queen's Pawn Game |
| 36. Leonhardt vs Maroczy |
| 0-1 | 55 |
1905 |
Barmen Masters A, GER | C50 Giuoco Piano |
| 37. Maroczy vs Leonhardt |
| 1-0 | 34 |
1905 |
Ostend | D63 Queen's Gambit Declined, Orthodox Defense |
| 38. Teichmann vs Leonhardt |
| 1-0 | 24 |
1905 |
Berlin | C67 Ruy Lopez |
| 39. Leonhardt vs Alapin |
| 1-0 | 59 |
1905 |
Ostend | C14 French, Classical |
| 40. H Suechting vs Leonhardt |
| ½-½ | 32 |
1905 |
Barmen Masters A, GER | C67 Ruy Lopez |
| 41. Tarrasch vs Leonhardt |
| 1-0 | 26 |
1905 |
Ostend | D55 Queen's Gambit Declined |
| 42. Leonhardt vs J Esser |
 | 1-0 | 16 |
1905 |
**Rd--()-, Schevenin | C67 Ruy Lopez |
| 43. Marshall vs Leonhardt |
| 0-1 | 60 |
1905 |
Ostend | D51 Queen's Gambit Declined |
| 44. Duras vs Leonhardt |
| 1-0 | 39 |
1905 |
Scheveningen | C65 Ruy Lopez, Berlin Defense |
| 45. Janowski vs Leonhardt |
 | 1-0 | 30 |
1905 |
Ostend | D60 Queen's Gambit Declined, Orthodox Defense |
| 46. Leonhardt vs O Bernstein |
| 1-0 | 56 |
1905 |
Barmen Masters A, GER | B25 Sicilian, Closed |
| 47. Taubenhaus vs Leonhardt |
| 0-1 | 31 |
1905 |
Ostend | C33 King's Gambit Accepted |
| 48. W John vs Leonhardt |
| 0-1 | 52 |
1905 |
Barmen Masters A, GER | C67 Ruy Lopez |
| 49. Leonhardt vs H Wolf |
| 0-1 | 26 |
1905 |
Ostend | C79 Ruy Lopez, Steinitz Defense Deferred |
| 50. Leonhardt vs Marshall |
| 0-1 | 33 |
1905 |
Ostend | C11 French |