| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. L Alster vs Prochazka |
 | 1-0 | 11 | 1944 | Melnik, CZE | A51 Budapest Gambit |
| 2. L Alster vs G van Doesburgh |
| 0-1 | 40 | 1947 | Netherlands - Czechoslovakia | C11 French |
| 3. G van Doesburgh vs L Alster |
| ½-½ | 30 | 1947 | Netherlands - Czechoslovakia | B58 Sicilian |
| 4. R W Bonham vs L Alster |
| 1-0 | 40 | 1947 | Match MCCU-CZE | E72 King's Indian |
| 5. L Alster vs R W Bonham |
| ½-½ | 51 | 1947 | Match MCCU-CZE | D62 Queen's Gambit Declined, Orthodox, Rubinstein Attack |
| 6. J Foltys vs L Alster |
| ½-½ | 40 | 1948 | Czechoslovak Championship | E72 King's Indian |
| 7. V Olexa vs L Alster |
| 0-1 | 30 | 1948 | Czechoslovak Championship | A15 English |
| 8. J Louma vs L Alster |
| 1-0 | 78 | 1948 | Czechoslovak Championship | B72 Sicilian, Dragon |
| 9. L Alster vs C Kottnauer |
| 1-0 | 41 | 1948 | Czechoslovak Championship | A19 English, Mikenas-Carls, Sicilian Variation |
| 10. L Alster vs J Sajtar |
| ½-½ | 16 | 1948 | Czechoslovak Championship | D59 Queen's Gambit Declined, Tartakower |
| 11. J Kracmar vs L Alster |
| 1-0 | 24 | 1948 | Czechoslovak Championship | A07 King's Indian Attack |
| 12. M Ujtelky vs L Alster |
| 0-1 | 47 | 1948 | Czechoslovak Championship | D75 Neo-Grunfeld, 6.cd Nxd5, 7.O-O c5, 8.dxc5 |
| 13. F Zita vs L Alster |
| 1-0 | 42 | 1948 | Czechoslovak Championship | A04 Reti Opening |
| 14. B Milic vs L Alster |
| ½-½ | 35 | 1948 | Czechoslovakia - Yugoslavia | D74 Neo-Grunfeld, 6.cd Nxd5, 7.O-O |
| 15. L Alster vs B Milic |
| 0-1 | 41 | 1948 | Czechoslovakia - Yugoslavia | D62 Queen's Gambit Declined, Orthodox, Rubinstein Attack |
| 16. N Borowski vs L Alster |
| 0-1 | 27 | 1949 | POL-CSR | A16 English |
| 17. L Alster vs F Auer |
| 1-0 | 28 | 1949 | CZE-AUT | A18 English, Mikenas-Carls |
| 18. L Alster vs N Borowski |
| 0-1 | 40 | 1949 | POL-CSR | D01 Richter-Veresov Attack |
| 19. E Stoeckl vs L Alster |
| 0-1 | 45 | 1949 | CZE-AUT | B21 Sicilian, 2.f4 and 2.d4 |
| 20. L Alster vs T Leinweber |
| 0-1 | 51 | 1949 | Austria - Czechoslovakia | A28 English |
| 21. T Leinweber vs L Alster |
| ½-½ | 75 | 1949 | Austria - Czechoslovakia | B40 Sicilian |
| 22. Bobotsov vs L Alster |
| 1-0 | 34 | 1950 | CSR-BUL | B73 Sicilian, Dragon, Classical |
| 23. P Petrov vs L Alster |
| 0-1 | 22 | 1950 | CSR-BUL | E60 King's Indian Defense |
| 24. V Hofman vs L Alster |
| 1-0 | 40 | 1953 | Czechoslovak Championship | A00 Uncommon Opening |
| 25. L Alster vs K Opocensky |
| ½-½ | 35 | 1953 | Czechoslovak Championship | A07 King's Indian Attack |
Kibitzing
