| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Plachetka vs M Seifert |
| 1-0 | 39 |
1965 |
Harrachov U26 | E91 King's Indian |
| 2. Plachetka vs Avner |
| ½-½ | 18 |
1966 |
Orebro Stud olm fA | E92 King's Indian |
| 3. Plachetka vs E Scholl |
| ½-½ | 46 |
1966 |
Orebro Stud olm prelim2 | E93 King's Indian, Petrosian System |
| 4. Plachetka vs Vykydal Frantisek |
| 1-0 | 63 |
1968 |
CSR-ch | E91 King's Indian |
| 5. Plachetka vs Hort |
| 0-1 | 45 |
1968 |
CZE | E93 King's Indian, Petrosian System |
| 6. Plachetka vs B Kummer |
| 1-0 | 39 |
1968 |
WchT U26 15th fin-A | E61 King's Indian |
| 7. Plachetka vs Soltis |
| 1-0 | 41 |
1968 |
WchT U26 15th fin-A | E61 King's Indian |
| 8. Plachetka vs J Dolezal |
| ½-½ | 20 |
1968 |
CSR-ch | E92 King's Indian |
| 9. Plachetka vs J Boudy |
| 1-0 | 34 |
1969 |
WchT U26 qual-D | E60 King's Indian Defense |
| 10. Plachetka vs Smejkal |
| 0-1 | 38 |
1969 |
Luhacovice | E67 King's Indian, Fianchetto |
| 11. Plachetka vs Podgaets |
| 0-1 | 37 |
1969 |
WchT U26 fin-A 16th | E62 King's Indian, Fianchetto |
| 12. Plachetka vs Jansa |
| 0-1 | 55 |
1970 |
Havirov CZE ch | E75 King's Indian, Averbakh, Main line |
| 13. Plachetka vs Bukic |
| 0-1 | 40 |
1970 |
EU-chT (Men) | E60 King's Indian Defense |
| 14. Plachetka vs Vogt |
| ½-½ | 22 |
1971 |
Novy Smokovec | E61 King's Indian |
| 15. Plachetka vs J Franzen |
| 1-0 | 58 |
1972 |
CSR-ch | E69 King's Indian, Fianchetto, Classical Main line |
| 16. Plachetka vs Malis Jiri |
| 0-1 | 45 |
1972 |
CSR-ch | E61 King's Indian |
| 17. Plachetka vs Jansa |
| ½-½ | 26 |
1974 |
CSR-ch | E62 King's Indian, Fianchetto |
| 18. Plachetka vs F Portisch |
| ½-½ | 35 |
1975 |
Toth mem 5th | E61 King's Indian |
| 19. Plachetka vs Jansa |
| ½-½ | 86 |
1976 |
Decin-A | E88 King's Indian, Samisch, Orthodox, 7.d5 c6 |
| 20. Plachetka vs A Lanc |
| ½-½ | 42 |
1976 |
CSR-ch | E62 King's Indian, Fianchetto |
| 21. Plachetka vs J Sikora-Lerch |
| 0-1 | 44 |
1976 |
CSR-ch | E92 King's Indian |
| 22. Plachetka vs I Hausner |
| 1-0 | 58 |
1976 |
Decin-A | E68 King's Indian, Fianchetto, Classical Variation, 8.e4 |
| 23. Plachetka vs A Rodriguez |
| 0-1 | 58 |
1977 |
Tbilisi-Sukhumi | E97 King's Indian |
| 24. Plachetka vs I Schuetz |
| 1-0 | 40 |
1978 |
Rilton Cup | E97 King's Indian |
| 25. Plachetka vs I Hausner |
| ½-½ | 27 |
1978 |
CSR-ch | E70 King's Indian |
