| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. M Seibold vs G Menke |
| 1-0 | 19 | 1931 | International corr | C66 Ruy Lopez |
| 27. M Seibold vs H Nowarra |
| 0-1 | 21 | 1931 | International corr | C15 French, Winawer |
| 28. M Seibold vs H Strallhofer |
| ½-½ | 49 | 1931 | corr | C11 French |
| 29. M Seibold vs M Willemson |
| 1-0 | 35 | 1931 | International corr | C12 French, McCutcheon |
| 30. F Batik vs M Seibold |
| ½-½ | 45 | 1932 | IFSB corr | E34 Nimzo-Indian, Classical, Noa Variation |
| 31. M Seibold vs R Rey Ardid |
| 0-1 | 54 | 1932 | IFSB corr | C83 Ruy Lopez, Open |
| 32. M Seibold vs K Rattmann |
| 0-1 | 46 | 1932 | International corr | B23 Sicilian, Closed |
| 33. M Seibold vs H Mueller |
| 0-1 | 32 | 1932 | IFSB corr | C84 Ruy Lopez, Closed |
| 34. M Seibold vs F Kunert |
| 1-0 | 56 | 1932 | IFSB corr | C64 Ruy Lopez, Classical |
| 35. M Seibold vs J Keemink |
| ½-½ | 20 | 1932 | IFSB corr | C84 Ruy Lopez, Closed |
| 36. M Seibold vs H Geiger |
| 0-1 | 30 | 1932 | IFSB corr | B18 Caro-Kann, Classical |
| 37. M Seibold vs Eliskases |
| 0-1 | 39 | 1932 | IFSB corr | C84 Ruy Lopez, Closed |
| 38. M Seibold vs E Dyckhoff |
| ½-½ | 62 | 1932 | IFSB corr | C83 Ruy Lopez, Open |
| 39. M Seibold vs J Bernards |
| 0-1 | 37 | 1932 | corr | C10 French |
| 40. M Seibold vs F Batik |
| 0-1 | 63 | 1932 | International corr | C11 French |
| 41. O Ruester vs M Seibold |
| 1-0 | 26 | 1932 | IFSB corr | E46 Nimzo-Indian |
| 42. E Busch vs M Seibold |
| 1-0 | 67 | 1932 | IFSB corr | A46 Queen's Pawn Game |
| 43. M Seibold vs Keres |
 | 0-1 | 39 | 1932 | Deutsche Schachzeitung 1932/33 corr | C12 French, McCutcheon |
| 44. J Balogh vs M Seibold |
| 1-0 | 75 | 1932 | IFSB corr | C77 Ruy Lopez |
| 45. Olland vs M Seibold |
| 0-1 | 31 | 1932 | IFSB corr | C22 Center Game |
| 46. E Weiss vs M Seibold |
| 1-0 | 20 | 1933 | W-ch sf corr | C54 Giuoco Piano |
| 47. A Schaum vs M Seibold |
| 0-1 | 41 | 1933 | IFSB corr | C45 Scotch Game |
| 48. M Seibold vs Keres |
| ½-½ | 79 | 1934 | corr | C12 French, McCutcheon |
| 49. M Seibold vs Keres |
| 0-1 | 50 | 1934 | Deutsche Schachzeitung-8 corr | C78 Ruy Lopez |
| 50. Keres vs M Seibold |
| 0-1 | 43 | 1934 | Deutsche Schachzeitung-8 corr | C33 King's Gambit Accepted |
Kibitzing
