R. Jonas
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Neuwied op-B | ??/??/1993 | 90 |  Germany |
| Massy op | ??/??/1993 | 435 |  France |
| Regionalliga NordN | ??/??/1990 | 400 | Germany |
| BL2-N 8889 | 10/??/1988 | 1018 | Germany |
R. Jonas Repertoire with White pieces (most played)
| ECO | Opening | Games |
| B23 | Sicilian, closed | 3 games |
| C48 | Four knights, Spanish variation | 1 games |
| E80 | King's Indian, Saemisch variation | 1 games |
| B02 | Alekhine's defence | 1 games |
R. Jonas Repertoire with Black pieces (most played)
| ECO | Opening | Games |
| B20 | Sicilian defence | 2 games |
| C43 | Petrov, modern (Steinitz) attack | 1 games |
| C42 | Petrov's defence | 1 games |
| A12 | English, Caro-Kann defensive system | 1 games |
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