M. Ruisdonk
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Lenk Seniors | ??/??/1989 | 245 | Switzerland |
Most Played Openings as White
| ECO | Opening | Games |
| C50 | King's pawn game | 1 games |
| B26 | Sicilian, closed, 6.Be3 | 1 games |
| B54 | Sicilian | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| C90 | Ruy Lopez, closed (with ...d6) | 1 games |
| C68 | Ruy Lopez, exchange variation | 1 games |
| C96 | Ruy Lopez, closed (8...Na5) | 1 games |
| C55 | Two knights defence | 1 games |


Switzerland