Sebastian Hiemstra
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Hengelo op U20 | 08/??/2001 | 206 | Netherlands |
| NED-ch U20 op | 08/07/2000 | 243 | Netherlands |
| NED U20 op | 08/09/1999 | 481 | Netherlands |
| Hengelo op U16 | ??/??/1997 | 27 | Netherlands |
Most Played Openings as White
| ECO | Opening | Games |
| A01 | Nimzovich-Larsen attack | 4 games |
| C33 | King's gambit accepted | 2 games |
| C36 | King's Gambit Accepted, Abbazia defence (classical defence, modern defence[!]) | 2 games |
| B58 | Sicilian, classical | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| B00 | King's pawn opening | 3 games |
| B33 | Sicilian defence | 2 games |
| B25 | Sicilian, closed | 1 games |
| A92 | Dutch defence | 1 games |


Netherlands