R. Zumbrunnen
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| USA Masters | ??/??/1990 | 920 |  United States |
| Midwest Masters op | ??/??/1989 | 816 | United States |
| Midwest Masters op | ??/??/1988 | 733 | United States |
| Ann Arbor ch-MI op | ??/??/1983 | 30 | United States |
R. Zumbrunnen Opening Repertoire with White pieces
| ECO | Opening | Games |
| B25 | Sicilian, closed | 2 games |
| B24 | Sicilian, closed | 2 games |
| A03 | Bird's opening | 1 games |
| B88 | Sicilian, Sozin, Leonhardt variation | 1 games |
R. Zumbrunnen Opening Repertoire with Black pieces
| ECO | Opening | Games |
| B33 | Sicilian defence | 4 games |
| D34 | Queen's Gambit Declined, Tarrasch, Prague variation, 7...Be7 | 2 games |
| B24 | Sicilian, closed | 1 games |
| D40 | Queen's Gambit Declined, Semi-Tarrasch defence | 1 games |
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