| Competition nameSGK Kerst 2025 |
| Group 1 - Jan Piersma |
| Site | Start date | 23-12-2025 | |
| City | End date | 23-12-2025 | |
| Country | Netherlands | Pairing system | Swiss |
| Organization | Schaakgroep Koedijk | Arbiters |
| Jan Piersma | |
| ID | |
| Rating | 0 |
| Categories | |
| Nr. | White | Black | Result |
| 1 | John Fokke | Jan Piersma | ½−½ |
| 2 | Jan Piersma | Jan Hettema | 1−0 |
| 3 | Jaap Baalbergen | Jan Piersma | 0−1 |
| 4 | Jan Piersma | Timon Ensink | 0−1 |
| 5 | Koen Monté | Jan Piersma | 0−1 |
| 6 | Jan Piersma | André Buter | 0−1 |
| 7 | Jan Piersma | Gert Kalkhoven | 1−0 |
| 8 | Paul Roomer | Jan Piersma | 0−1 |
| 9 | Jan Piersma | Reg Roodzant | 0−1 |