| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Plachetka vs J Franzen |
| 0-1 | 27 |
1965 |
Klasterec nad Orlici U18 6566 | C97 Ruy Lopez, Closed, Chigorin |
| 2. Plachetka vs I Novak |
| 0-1 | 31 |
1965 |
Klasterec nad Orlici U18 6566 | C64 Ruy Lopez, Classical |
| 3. Plachetka vs B Schendstock |
| 1-0 | 45 |
1968 |
WchT U26 15th qual-E | C85 Ruy Lopez, Exchange Variation Doubly Deferred (DERLD) |
| 4. Plachetka vs Lehmann |
| ½-½ | 28 |
1969 |
Stary Smokovec | C85 Ruy Lopez, Exchange Variation Doubly Deferred (DERLD) |
| 5. Plachetka vs Szabo |
| ½-½ | 42 |
1972 |
Stary Smokovec | C75 Ruy Lopez, Modern Steinitz Defense |
| 6. Plachetka vs G Kluger |
| 1-0 | 37 |
1972 |
Lublin Festival 8th | C96 Ruy Lopez, Closed |
| 7. Plachetka vs Kholmov |
| ½-½ | 53 |
1973 |
CSR-ch | C87 Ruy Lopez |
| 8. Plachetka vs V Stoica |
| ½-½ | 40 |
1974 |
Stary Smokovec | C61 Ruy Lopez, Bird's Defense |
| 9. Plachetka vs J Banas |
| ½-½ | 26 |
1974 |
Stary Smokovec | C63 Ruy Lopez, Schliemann Defense |
| 10. Plachetka vs Pinter |
| ½-½ | 68 |
1974 |
Stary Smokovec | C78 Ruy Lopez |
| 11. Plachetka vs J Lechtynsky |
| 0-1 | 44 |
1974 |
CSR-ch | C69 Ruy Lopez, Exchange, Gligoric Variation, 6.d4 |
| 12. Plachetka vs R Grabczewski |
| 1-0 | 35 |
1975 |
Toth mem 5th | C78 Ruy Lopez |
| 13. Plachetka vs Kholmov |
| ½-½ | 54 |
1975 |
Toth mem 5th | C85 Ruy Lopez, Exchange Variation Doubly Deferred (DERLD) |
| 14. Plachetka vs Stanislav Matas |
| 1-0 | 40 |
1975 |
SVK-ch | C69 Ruy Lopez, Exchange, Gligoric Variation, 6.d4 |
| 15. Plachetka vs J Trapl |
| ½-½ | 17 |
1976 |
Decin-A | C69 Ruy Lopez, Exchange, Gligoric Variation, 6.d4 |
| 16. Plachetka vs Tseshkovsky |
| 0-1 | 38 |
1976 |
Dubna | C88 Ruy Lopez |
| 17. Plachetka vs Savon |
| ½-½ | 16 |
1976 |
Odessa | C69 Ruy Lopez, Exchange, Gligoric Variation, 6.d4 |
| 18. Plachetka vs I Jelen |
| ½-½ | 64 |
1977 |
Maribor | C92 Ruy Lopez, Closed |
| 19. Plachetka vs Suba |
| ½-½ | 52 |
1977 |
Decin | C60 Ruy Lopez |
| 20. Plachetka vs J Noria Silvestre |
| 0-1 | 39 |
1977 |
olm9 qual GP2 B4 corr | C96 Ruy Lopez, Closed |
| 21. Plachetka vs Vokac |
| ½-½ | 39 |
1978 |
CSR-ch | C93 Ruy Lopez, Closed, Smyslov Defense |
| 22. Plachetka vs Vogt |
| ½-½ | 15 |
1979 |
Stary Smokovec | C95 Ruy Lopez, Closed, Breyer |
| 23. Plachetka vs L Hazai |
| ½-½ | 17 |
1979 |
Sofia | C68 Ruy Lopez, Exchange |
| 24. Plachetka vs S Cvetkovic |
| 1-0 | 33 |
1981 |
Tirnava | C84 Ruy Lopez, Closed |
| 25. Plachetka vs A Sygulski |
| ½-½ | 53 |
1983 |
Warsaw | C88 Ruy Lopez |