| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. L Alster vs Prochazka |
 | 1-0 | 11 |
1944 |
Melnik, CZE | A51 Budapest Gambit |
| 2. R W Bonham vs L Alster |
 | 1-0 | 40 |
1947 |
Match MCCU-CZE | E72 King's Indian |
| 3. L Alster vs C Kottnauer |
| 1-0 | 41 |
1948 |
CSR-ch | A19 English, Mikenas-Carls, Sicilian Variation |
| 4. M Bobotsov vs L Alster |
| 1-0 | 34 |
1950 |
CSR-BUL | B73 Sicilian, Dragon, Classical |
| 5. L Alster vs Sajtar |
| 1-0 | 31 |
1953 |
CSR-ch Prague | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 6. L Alster vs J Sefc |
| 1-0 | 56 |
1953 |
CSR-ch | A08 King's Indian Attack |
| 7. J Kozma vs L Alster |
 | 1-0 | 27 |
1953 |
CSR-ch Prague | B76 Sicilian, Dragon, Yugoslav Attack |
| 8. J Rejfir vs L Alster |
 | 1-0 | 75 |
1955 |
CSR-ch | E80 King's Indian, Samisch Variation |
| 9. L Alster vs J Sefc |
| 1-0 | 56 |
1955 |
CSR-54ch playoff 3rd place | D44 Queen's Gambit Declined Semi-Slav |
| 10. L Alster vs Ujtelky |
| 1-0 | 25 |
1955 |
CSR-ch | A43 Old Benoni |
| 11. Ujtelky vs L Alster |
| 1-0 | 53 |
1955 |
CSR-54ch playoff 3rd place | E98 King's Indian, Orthodox, Taimanov, 9.Ne1 |
| 12. J Dolezal vs L Alster |
| 1-0 | 39 |
1956 |
Podebrady | A88 Dutch, Leningrad, Main Variation with c6 |
| 13. J Rejfir vs L Alster |
| 1-0 | 42 |
1956 |
Marianske Lazne/Praha | A21 English |
| 14. L Alster vs J Enevoldsen |
| 1-0 | 37 |
1956 |
Moscow ol (Men) | E10 Queen's Pawn Game |
| 15. Bronstein vs L Alster |
| 1-0 | 37 |
1957 |
Wien-Baden | A46 Queen's Pawn Game |
| 16. Larsen vs L Alster |
| 1-0 | 41 |
1957 |
Wageningen zt | A43 Old Benoni |
| 17. Schmid vs L Alster |
 | 1-0 | 24 |
1957 |
EU-chT (Men) | B21 Sicilian, 2.f4 and 2.d4 |
| 18. Ivkov vs L Alster |
| 1-0 | 36 |
1957 |
EU-chT Vienna\\Baden | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 19. J Kozma vs L Alster |
 | 1-0 | 18 |
1959 |
Marianske Lazne | A92 Dutch |
| 20. L Alster vs J Kozma |
| 1-0 | 50 |
1959 |
CSR-ch | C21 Center Game |
| 21. L Alster vs J Rejfir |
| 1-0 | 52 |
1960 |
CSR-ch | B81 Sicilian, Scheveningen, Keres Attack |
| 22. J Marsalek vs L Alster |
| 1-0 | 41 |
1960 |
CSR-ch | E41 Nimzo-Indian |
| 23. L Alster vs J Vesely |
| 1-0 | 27 |
1962 |
CSR-ch | D32 Queen's Gambit Declined, Tarrasch |
| 24. F Blatny vs L Alster |
| 1-0 | 40 |
1962 |
CSR-ch | B02 Alekhine's Defense |
| 25. L Alster vs J Kozma |
| 1-0 | 50 |
1962 |
CSR-ch | B92 Sicilian, Najdorf, Opocensky Variation |