R. Petrak
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Prague Cedok op | ??/??/1996 | 850 |  Czech Republic |
| Prague op | ??/??/1996 | 847 | Czech Republic |
R. Petrak Opening Repertoire with White pieces
| ECO | Opening | Games |
| B31 | Sicilian, Nimzovich-Rossolimo attack (with ...g6, without ...d6) | 1 games |
| B92 | Sicilian, Najdorf, Opovcensky variation | 1 games |
| B85 | Sicilian, Scheveningen, classical variation with ...Qc7 and ...Nc6 | 1 games |
| B17 | Caro-Kann, Steinitz variation | 1 games |
R. Petrak Opening Repertoire with Black pieces
| ECO | Opening | Games |
| B02 | Alekhine's defence | 2 games |
| D10 | Queen's Gambit Declined Slav defence | 1 games |
| C02 | French, advance variation | 1 games |
| D16 | Queen's Gambit Declined Slav accepted, Alapin variation | 1 games |
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