| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. J Sefc vs L Alster |
| 0-1 | 42 | 1955 | CSR-54ch playoff 3rd place | B76 Sicilian, Dragon, Yugoslav Attack |
| 27. L Alster vs K Makarczyk |
| ½-½ | 63 | 1955 | Prague tm | D43 Queen's Gambit Declined Semi-Slav |
| 28. K Makarczyk vs L Alster |
| ½-½ | 23 | 1955 | Prague tm | E92 King's Indian |
| 29. L Alster vs J Kozma |
| 0-1 | 31 | 1955 | CSR-ch Army | A06 Reti Opening |
| 30. L Alster vs Ujtelky |
 | 1-0 | 25 | 1955 | CSR-ch | A43 Old Benoni |
| 31. J Kozma vs L Alster |
| 0-1 | 56 | 1955 | CSR-ch | B45 Sicilian, Taimanov |
| 32. J Vesely vs L Alster |
| ½-½ | 20 | 1955 | CSR-ch | B07 Pirc |
| 33. J Rejfir vs L Alster |
| 1-0 | 75 | 1955 | CSR-ch | E80 King's Indian, Samisch Variation |
| 34. L Alster vs Filip |
| ½-½ | 20 | 1956 | Marianske Lazne/Praha | E85 King's Indian, Samisch, Orthodox Variation |
| 35. L Alster vs J Sefc |
| 0-1 | 51 | 1956 | Marianske Lazne/Praha | D50 Queen's Gambit Declined |
| 36. Pachman vs L Alster |
| ½-½ | 24 | 1956 | Marianske Lazne/Praha | E75 King's Indian, Averbakh, Main line |
| 37. J Rejfir vs L Alster |
| 1-0 | 42 | 1956 | Marianske Lazne/Praha | A21 English |
| 38. Ujtelky vs L Alster |
| ½-½ | 22 | 1956 | Marianske Lazne/Praha | A15 English |
| 39. L Alster vs Flohr |
| 0-1 | 37 | 1956 | Marianske Lazne/Praha | B28 Sicilian, O'Kelly Variation |
| 40. Kostantinos Pavlatos vs L Alster |
| 1-0 | 27 | 1956 | Moscow ol (Men) qual-D | B41 Sicilian, Kan |
| 41. L Alster vs J Enevoldsen |
| 1-0 | 37 | 1956 | Moscow ol (Men) fin-A | A70 Benoni, Classical with 7.Nf3 |
| 42. L Alster vs Soos |
| 1-0 | 58 | 1956 | Moscow ol (Men) fin-A | E61 King's Indian |
| 43. I Aloni vs L Alster |
| ½-½ | 48 | 1956 | Moscow ol (Men) fin-A | E86 King's Indian, Samisch, Orthodox, 7.Nge2 c6 |
| 44. L Alster vs M Bely |
| 0-1 | 41 | 1956 | Moscow ol (Men) fin-A | D15 Queen's Gambit Declined Slav |
| 45. F Blatny vs L Alster |
| ½-½ | 40 | 1956 | CSR-ch | B76 Sicilian, Dragon, Yugoslav Attack |
| 46. L Alster vs J Marsalek |
| ½-½ | 58 | 1956 | CSR-ch | C63 Ruy Lopez, Schliemann Defense |
| 47. Ujtelky vs L Alster |
| ½-½ | 18 | 1956 | CSR-ch | A49 King's Indian, Fianchetto without c4 |
| 48. L Alster vs J Kozma |
| ½-½ | 24 | 1956 | CSR-ch | E15 Queen's Indian |
| 49. J Dolezal vs L Alster |
| 1-0 | 39 | 1956 | CSR-ch | A88 Dutch, Leningrad, Main Variation with c6 |
| 50. L Alster vs Sajtar |
| ½-½ | 19 | 1956 | CSR-ch | B30 Sicilian |
Kibitzing
