| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. Plachetka vs J Lechtynsky |
| 0-1 | 44 | 1974 | Czechoslovak Championship | C69 Ruy Lopez, Exchange, Gligoric Variation |
| 2. Plachetka vs S Matas |
| 1-0 | 40 | 1975 | SVK-ch | C69 Ruy Lopez, Exchange, Gligoric Variation |
| 3. Plachetka vs J Trapl |
| ½-½ | 17 | 1976 | Decin-A | C69 Ruy Lopez, Exchange, Gligoric Variation |
| 4. Plachetka vs Savon |
| ½-½ | 16 | 1976 | Odessa | C69 Ruy Lopez, Exchange, Gligoric Variation |
| 5. Plachetka vs T Ledic |
| ½-½ | 15 | 1977 | Jovan Georgevic Memorial | C69 Ruy Lopez, Exchange, Gligoric Variation |
| 6. Plachetka vs J Lechtynsky |
| ½-½ | 13 | 1978 | Czechoslovak Championship | C69 Ruy Lopez, Exchange, Gligoric Variation |
Kibitzing
