| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. I Koenig vs L Singer |
| 1-0 | 31 | 1929 | Rogaska Slatina | D63 Queen's Gambit Declined, Orthodox Defense |
| 27. Flohr vs I Koenig |
  | 1-0 | 41 | 1929 | Rogaska Slatina | A50 Queen's Pawn Game |
| 28. Rubinstein vs I Koenig |
| ½-½ | 60 | 1929 | Rogaska Slatina | A46 Queen's Pawn Game |
| 29. I Koenig vs E Canal |
| 0-1 | 46 | 1929 | Rogaska Slatina | E10 Queen's Pawn Game |
| 30. Maroczy vs I Koenig |
| 1-0 | 38 | 1929 | Rogaska Slatina | C02 French, Advance |
| 31. I Koenig vs Gruenfeld |
| 0-1 | 28 | 1929 | Rogaska Slatina | D37 Queen's Gambit Declined |
| 32. K Rozic vs I Koenig |
| 0-1 | 35 | 1929 | Rogaska Slatina | A83 Dutch, Staunton Gambit |
| 33. A Becker vs I Koenig |
| ½-½ | 43 | 1931 | Trebitsch Memorial | C17 French, Winawer, Advance |
| 34. I Koenig vs F Kunert |
| 1-0 | 29 | 1931 | Trebitsch Memorial | B58 Sicilian |
| 35. J Lokvenc vs I Koenig |
| 0-1 | 41 | 1931 | Trebitsch Memorial | A13 English |
| 36. I Koenig vs B Hoenlinger |
| ½-½ | 14 | 1931 | Trebitsch Memorial | D24 Queen's Gambit Accepted |
| 37. S Boros vs I Koenig |
| 0-1 | 24 | 1931 | Trebitsch Memorial | D31 Queen's Gambit Declined |
| 38. I Koenig vs L Metanomski |
| 1-0 | 35 | 1931 | Trebitsch Memorial | D55 Queen's Gambit Declined |
| 39. I Koenig vs L Steiner |
| 0-1 | 29 | 1931 | Trebitsch Memorial | D11 Queen's Gambit Declined Slav |
| 40. B Lichtenstein vs I Koenig |
| 0-1 | 52 | 1931 | Trebitsch Memorial | E00 Queen's Pawn Game |
| 41. I Koenig vs H Mueller |
| 1-0 | 41 | 1931 | Trebitsch Memorial | E15 Queen's Indian |
| 42. Gruenfeld vs I Koenig |
| 1-0 | 48 | 1931 | Trebitsch Memorial | E11 Bogo-Indian Defense |
| 43. I Koenig vs S Beutum |
| 1-0 | 29 | 1931 | Trebitsch Memorial | B04 Alekhine's Defense, Modern |
| 44. E Glass vs I Koenig |
| ½-½ | 51 | 1931 | Trebitsch Memorial | E00 Queen's Pawn Game |
| 45. I Koenig vs S R Wolf |
| 1-0 | 84 | 1931 | Trebitsch Memorial | E15 Queen's Indian |
| 46. I Koenig vs Duchamp |
| 1-0 | 31 | 1931 | Prague Olympiad | E12 Queen's Indian |
| 47. I Koenig vs E Lundin |
| 1-0 | 38 | 1931 | Prague Olympiad | D66 Queen's Gambit Declined, Orthodox Defense, Bd3 line |
| 48. M Luckis vs I Koenig |
| 0-1 | 29 | 1931 | Prague Olympiad | C45 Scotch Game |
| 49. E Hellmann vs I Koenig |
| 0-1 | 42 | 1931 | Prague Olympiad | A02 Bird's Opening |
| 50. I Koenig vs W Michel |
| ½-½ | 40 | 1931 | Prague Olympiad | C97 Ruy Lopez, Closed, Chigorin |
Kibitzing
