| Name: | Chiel Koster |
| Federation: |  Netherlands |
| Sex: |
 Male
|
| Born: | 1998 |
 FIDE ID: |
1047990 FIDE Profile |
| Title: | Candidate Master |
| ELO Classic: | 2211 |
| ELO Blitz: | 2015 |
| Years: | 2025 - 2025 |
| Total Games: | 2 |
| Wins: | 0 (0 %) |
| Draws: | 1 (50 %) |
| Losses: | 1 (50 %) |
| Score: | 25 % |
| Tournament | Date | Elo Avg. | Country |
| 17th BPB Limburg Open | 06/06/2025 | 2252 | Netherlands |
| ECO | Opening | Games |
| A27 | English, three knights system | 1 games |
| ECO | Opening | Games |
| B30 | Sicilian defence | 1 games |
| White | ELO W | Black | ELO B | Result | Moves | ECO | Date | Tournament | View |
| Koster, C | 2141 | Kurt, S | 2312 | ½-½  |
22 | A27 | 2025 | 17th BPB Limburg Open |
|
| Barzen, P | 2348 | Koster, C | 2141 | 1-0 |
40 | B30 | 2025 | 17th BPB Limburg Open |
|
