| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. G Oskam vs J W te Kolste |
| 1-0 | 26 | 1905 | DD winter | D32 Queen's Gambit Declined, Tarrasch |
| 27. G Oskam vs Rubinstein |
 | 0-1 | 63 | 1906 | Ostend | C01 French, Exchange |
| 28. P P Saburov vs G Oskam |
| 0-1 | 24 | 1906 | Ostend | D30 Queen's Gambit Declined |
| 29. G Oskam vs W John |
| 0-1 | 24 | 1906 | Ostend | D31 Queen's Gambit Declined |
| 30. Maroczy vs G Oskam |
| 1-0 | 19 | 1906 | Ostend | D32 Queen's Gambit Declined, Tarrasch |
| 31. G Oskam vs G Marco |
| ½-½ | 31 | 1906 | Ostend | C41 Philidor Defense |
| 32. W Cohn vs G Oskam |
| 1-0 | 22 | 1906 | Ostend | C26 Vienna |
| 33. G Oskam vs P Johner |
| 0-1 | 43 | 1906 | Ostend | C29 Vienna Gambit |
| 34. H Fahrni vs G Oskam |
| 1-0 | 56 | 1906 | Ostend | C80 Ruy Lopez, Open |
| 35. G Oskam vs L Forgacs |
| ½-½ | 35 | 1906 | Ostend | D52 Queen's Gambit Declined |
| 36. K Susholz vs G Oskam |
| ½-½ | 18 | 1907 | R.S. - D.S. | C63 Ruy Lopez, Schliemann Defense |
| 37. J W te Kolste vs G Oskam |
| 1-0 | 23 | 1907 | Amsterdam | C87 Ruy Lopez |
| 38. J W te Kolste vs G Oskam |
| 1-0 | 47 | 1907 | Utrecht | C80 Ruy Lopez, Open |
| 39. G Oskam vs J Esser |
| 0-1 | 47 | 1908 | NSB Hoofdklasse | C25 Vienna |
| 40. Lasker vs G Oskam |
| 1-0 | 20 | 1908 | Simul, 25b | C21 Center Game |
| 41. Lasker vs G Oskam |
 | 0-1 | 35 | 1908 | Simul, 25b | C78 Ruy Lopez |
| 42. H Gouwentak vs G Oskam |
| ½-½ | 19 | 1908 | DCA Congress 36th | C50 Giuoco Piano |
| 43. Capablanca vs G Oskam |
| 1-0 | 22 | 1911 | Netherlands Tour Capablanca | D00 Queen's Pawn Game |
| 44. Capablanca vs G Oskam |
| 0-1 | 51 | 1911 | Simul, 25b | D00 Queen's Pawn Game |
| 45. Capablanca vs G Oskam |
| 1-0 | 59 | 1911 | Simul, 25b | C49 Four Knights |
| 46. D M Schapiro vs G Oskam |
| ½-½ | 44 | 1911 | Niederrheinischer Schachverband-NSB | C67 Ruy Lopez |
| 47. J Hoogeveen vs G Oskam |
| 1-0 | 24 | 1912 | Rotterdam | C67 Ruy Lopez |
| 48. Van der Waals vs G Oskam |
| 0-1 | 33 | 1913 | Rotterdam | B30 Sicilian |
| 49. J Mieses vs G Oskam |
| ½-½ | 26 | 1913 | Blind simul | C24 Bishop's Opening |
| 50. J Davidson vs G Oskam |
| 0-1 | 35 | 1913 | Davidson - Oskam | C42 Petrov Defense |
Kibitzing
