S. Gruen
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Triberg | ??/??/1991 | 728 |  Germany |
S. Gruen Repertoire with White pieces (most played)
| ECO | Opening | Games |
| B09 | Pirc, Austrian attack | 1 games |
| C16 | French, Winawer, advance variation | 1 games |
| B39 | Sicilian, accelerated fianchetto, Breyer variation | 1 games |
S. Gruen Repertoire with Black pieces (most played)
| ECO | Opening | Games |
| C12 | French, MacCutcheon variation | 2 games |
| B15 | Caro-Kann defence | 1 games |
| A42 | Modern defence, Averbakh system | 1 games |
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