Willem Siebenhaar
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Gouda | ??/??/1884 | 0 |  Netherlands |
Willem Siebenhaar Repertoire with White pieces (most played)
| ECO | Opening | Games |
| C58 | two knights defence | 1 games |
| B40 | Sicilian defence | 1 games |
| B23 | Sicilian, closed | 1 games |
| A13 | English opening | 1 games |
Willem Siebenhaar Repertoire with Black pieces (most played)
| ECO | Opening | Games |
| C45 | Scotch game | 1 games |
| A35 | English, symmetrical variation | 1 games |
| C58 | two knights defence | 1 games |
| C59 | Two knights defence | 1 games |
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