| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. J Marsalek vs Plachetka |
| ½-½ | 16 |
1962 |
CSR-ch | B31 Sicilian, Rossolimo Variation |
| 2. J Augustin vs Plachetka |
| 0-1 | 41 |
1962 |
CSR-ch | B40 Sicilian |
| 3. J Vesely vs Plachetka |
| ½-½ | 18 |
1962 |
CSR-ch | B50 Sicilian |
| 4. J Trapl vs Plachetka |
| 1-0 | 48 |
1962 |
CSR-ch | B89 Sicilian |
| 5. F Blatny vs Plachetka |
| 1-0 | 42 |
1962 |
CSR-ch | B26 Sicilian, Closed, 6.Be3 |
| 6. Paul O'Brien vs Plachetka |
| 0-1 | 24 |
1963 |
Prague-London U26 | B35 Sicilian, Accelerated Fianchetto, Modern Variation with Bc4 |
| 7. S Kupka vs Plachetka |
| ½-½ | 30 |
1964 |
Harrachov 6465 | B23 Sicilian, Closed |
| 8. P Voboril vs Plachetka |
| 0-1 | 59 |
1964 |
Harrachov 6465 | B73 Sicilian, Dragon, Classical |
| 9. P Ferenc vs Plachetka |
| 0-1 | 42 |
1965 |
Harrachov U26 | B34 Sicilian, Accelerated Fianchetto |
| 10. Poppy J Aarons vs Plachetka |
| 0-1 | 19 |
1965 |
Klasterec nad Orlici U18 6566 | B66 Sicilian, Richter-Rauzer Attack, 7...a6 |
| 11. E Nowak vs Plachetka |
| ½-½ | 52 |
1965 |
Harrachov U26 | B63 Sicilian, Richter-Rauzer Attack |
| 12. M Janata vs Plachetka |
| 1-0 | 41 |
1966 |
Harrachov U26 | B35 Sicilian, Accelerated Fianchetto, Modern Variation with Bc4 |
| 13. P Voboril vs Plachetka |
| 0-1 | 26 |
1966 |
Harrachov U26 | B63 Sicilian, Richter-Rauzer Attack |
| 14. K Teboudi vs Plachetka |
| 0-1 | 29 |
1969 |
WchT U26 qual-D | B63 Sicilian, Richter-Rauzer Attack |
| 15. F Hoelzl vs Plachetka |
| 1-0 | 79 |
1969 |
Stary Smokovec | B89 Sicilian |
| 16. Jansa vs Plachetka |
| ½-½ | 44 |
1969 |
Stary Smokovec | B63 Sicilian, Richter-Rauzer Attack |
| 17. Pribyl vs Plachetka |
| 1-0 | 40 |
1971 |
CSR-ch int | B89 Sicilian |
| 18. I Novak vs Plachetka |
| 0-1 | 45 |
1971 |
Novy Smokovec | B22 Sicilian, Alapin |
| 19. J Banas vs Plachetka |
| ½-½ | 15 |
1973 |
CSR-ch | B25 Sicilian, Closed |
| 20. B Modr vs Plachetka |
| 0-1 | 39 |
1974 |
CSR-ch | B26 Sicilian, Closed, 6.Be3 |
| 21. I Novak vs Plachetka |
| 0-1 | 40 |
1974 |
Stary Smokovec | B31 Sicilian, Rossolimo Variation |
| 22. C W Pritchett vs Plachetka |
| 1-0 | 31 |
1974 |
Decin | B77 Sicilian, Dragon, Yugoslav Attack |
| 23. Meduna vs Plachetka |
| ½-½ | 54 |
1974 |
CSR-ch | B54 Sicilian |
| 24. J Augustin vs Plachetka |
| ½-½ | 33 |
1974 |
CSR-ch | B40 Sicilian |
| 25. S Petrik vs Plachetka |
| 0-1 | 60 |
1975 |
SVK-ch | B83 Sicilian |