Jan Bonkenburg
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Leeuwarden op | 07/??/1994 | 2056 |  Netherlands |
| Haarlem AKN op | ??/??/1992 | 653 | Netherlands |
| Hoogovens-C | 01/??/1966 | 0 | Netherlands |
| Bognor Regis-A | ??/??/1965 | 0 |  United Kingdom |
Most Played Openings as White
| ECO | Opening | Games |
| D31 | Queen's Gambit Declined, 3.Nc3 | 1 games |
| E11 | Bogo-Indian defence | 1 games |
| E67 | King's Indian, fianchetto with ...Nd7 | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| E88 | King's Indian, Saemisch, orthodox, 7.d5 c6 | 1 games |
| C00 | French defence | 1 games |
| E67 | King's Indian, fianchetto with ...Nd7 | 1 games |
| B16 | Caro-Kann, Bronstein-Larsen variation | 1 games |
