| Intern 2026/2027 |
| Group 1 - Piet Kooiman |
| Site | Dijckzigt | Start date | 9-9-2025 |
| City | Utrecht | End date | 1-7-2026 |
| Country | Netherlands | Pairing system | Ladder |
| Organization | Schaakvereniging Oud Zuylen Utrecht | Arbiters | Marc Jongerius |
| Piet Kooiman | |
| ID | |
| Rating | 1838 |
| Categories | |
| Nr. | White | Black | Result |
| 1 | Ed van Eeden | Piet Kooiman | 1−0 |
| 2 | Piet Kooiman | Quint Van Willigen | 1−0 |