Male
FIDE ID:
Niels Ondersteijn
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| 39th ECC Open 2024 | 10/20/2024 | 2410 |  Serbia |
| Dutch League 2023-24 | 09/16/2023 | 2342 |  Netherlands |
| Dutch League 2024-25 | 09/21/2024 | 2267 | Netherlands |
| 38th ECC Open 2023 | 10/01/2023 | 2352 |  Albania |
Niels Ondersteijn Opening Repertoire with White pieces
| ECO | Opening | Games |
| B23 | Sicilian, closed | 19 games |
| A00 | Polish (Sokolsky) opening | 10 games |
| A01 | Nimzovich-Larsen attack | 5 games |
| A20 | English opening | 4 games |
Niels Ondersteijn Opening Repertoire with Black pieces
| ECO | Opening | Games |
| C41 | Philidor's defence | 18 games |
| B07 | Pirc defence | 12 games |
| B36 | Sicilian, accelerated fianchetto, Maroczy bind | 11 games |
| D85 | Gruenfeld, exchange variation | 10 games |
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