Maarten Koekoek
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Groningen Harmonie Mini op-C | 12/26/2002 | 1532 |  Netherlands |
| Groningen SO-ON Mini op | 12/26/2001 | 1890 | Netherlands |
| Groningen SO ON Mini op-D | 12/??/2000 | 0 | Netherlands |
| Groningen ABM op | ??/??/1999 | 286 | Netherlands |
Most Played Openings as White
| ECO | Opening | Games |
| C30 | King's gambit | 2 games |
| E81 | King's Indian, Saemisch, 5...O-O | 1 games |
| B80 | Sicilian, Scheveningen variation | 1 games |
| B46 | Sicilian, Taimanov variation | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| B22 | Sicilian, Alapin's variation (2.c3) | 1 games |
| A11 | English, Caro-Kann defensive system | 1 games |
| B50 | Sicilian | 1 games |
| B70 | Sicilian, dragon variation | 1 games |
