Martin Koolhoven
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Vlissingen HZ op 5th | 07/28/2001 | 808 | Netherlands |
| Vlissingen HZ op 3rd | 08/09/1999 | 678 | Netherlands |
| Vlissingen op | 07/??/1996 | 668 | Netherlands |
Most Played Openings as White
| ECO | Opening | Games |
| C06 | French, Tarrasch, closed variation, main line | 1 games |
| B75 | Sicilian, dragon, Yugoslav attack | 1 games |
| E91 | King's Indian, 6.Be2 | 1 games |
| C58 | two knights defence | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| C54 | Giuoco Piano | 1 games |
| D90 | Gruenfeld, Three knights variation | 1 games |
| B23 | Sicilian, closed | 1 games |
| B60 | Sicilian, Richter-Rauzer | 1 games |


Netherlands