| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. C Radovici vs J Sikora-Lerch |
| ½-½ | 31 | 1968 | Havirov | A16 English |
| 27. J Sikora-Lerch vs V Sviridov |
| 0-1 | 50 | 1968 | Havirov | C13 French |
| 28. H Baumgartner vs J Sikora-Lerch |
| ½-½ | 30 | 1968 | Havirov | A05 Reti Opening |
| 29. J Smetana vs J Sikora-Lerch |
| ½-½ | 25 | 1968 | Havirov | C07 French, Tarrasch |
| 30. J Sikora-Lerch vs Gulko |
 | 0-1 | 36 | 1968 | Havirov | C16 French, Winawer |
| 31. E Nowak vs J Sikora-Lerch |
| ½-½ | 19 | 1968 | Havirov | B06 Robatsch |
| 32. D Pantaleev vs J Sikora-Lerch |
| 0-1 | 44 | 1968 | Havirov | E80 King's Indian, Samisch Variation |
| 33. J Sikora-Lerch vs T Georgadze |
| ½-½ | 31 | 1968 | Havirov | B32 Sicilian |
| 34. J Sikora-Lerch vs L Lapis |
| 1-0 | 34 | 1968 | Havirov | C81 Ruy Lopez, Open, Howell Attack |
| 35. J Sikora-Lerch vs I Jankovec |
| 1-0 | 44 | 1968 | Havirov | B96 Sicilian, Najdorf |
| 36. J Sikora-Lerch vs J Lechtynsky |
| 0-1 | 35 | 1971 | CSR sf-C | B10 Caro-Kann |
| 37. E Nowak vs J Sikora-Lerch |
| ½-½ | 31 | 1972 | Czechoslovak Championship | C44 King's Pawn Game |
| 38. J Sikora-Lerch vs E Meduna |
| ½-½ | 37 | 1972 | Czechoslovak Championship | B11 Caro-Kann, Two Knights, 3...Bg4 |
| 39. Hort vs J Sikora-Lerch |
| 1-0 | 20 | 1972 | Czechoslovak Championship | A31 English, Symmetrical, Benoni Formation |
| 40. J Fichtl vs J Sikora-Lerch |
| 1-0 | 35 | 1972 | Czechoslovak Championship | C71 Ruy Lopez |
| 41. J Sikora-Lerch vs A Kubicek |
| 1-0 | 36 | 1972 | Czechoslovak Championship | B00 Uncommon King's Pawn Opening |
| 42. M Krisko vs J Sikora-Lerch |
| 0-1 | 33 | 1972 | CSR-ch+ | A31 English, Symmetrical, Benoni Formation |
| 43. J Sikora-Lerch vs Plachetka |
| 0-1 | 37 | 1972 | Czechoslovak Championship | C24 Bishop's Opening |
| 44. Jansa vs J Sikora-Lerch |
| 1-0 | 40 | 1972 | Czechoslovak Championship | A05 Reti Opening |
| 45. J Sikora-Lerch vs I Novak |
| 0-1 | 63 | 1972 | Czechoslovak Championship | B10 Caro-Kann |
| 46. I Jankovec vs J Sikora-Lerch |
| 0-1 | 37 | 1972 | Czechoslovak Championship | C41 Philidor Defense |
| 47. J Sikora-Lerch vs J Trapl |
| 0-1 | 41 | 1972 | Czechoslovak Championship | B21 Sicilian, 2.f4 and 2.d4 |
| 48. J Franzen vs J Sikora-Lerch |
| 1-0 | 37 | 1972 | Czechoslovak Championship | B33 Sicilian |
| 49. J Sikora-Lerch vs S Kupka |
| ½-½ | 22 | 1972 | Czechoslovak Championship | B11 Caro-Kann, Two Knights, 3...Bg4 |
| 50. J Pribyl vs J Sikora-Lerch |
| 1-0 | 19 | 1972 | Czechoslovak Championship | A42 Modern Defense, Averbakh System |
Kibitzing
