| Intern 2023/2024 |
| Group 1 - Piet Kooiman |
| Site | Dijckzigt | Start date | 7-11-2021 |
| City | Utrecht | End date | 7-11-2021 |
| Country | Netherlands | Pairing system | Ladder |
| Organization | Schaakvereniging Oud Zuylen Utrecht | Arbiters | Marc Jongerius |
| Piet Kooiman | |
| ID | |
| Rating | 1868 |
| Categories | |
| Nr | White | Black | Result |
| 1 | Giovanni van Basten | Piet Kooiman | 0−1 |
| 2 | Piet Kooiman | Jaap van der Tuuk | ½−½ |
| 3 | Piet Kooiman | Abs with msg | |
| 4 | Piet Kooiman | Abs for club | |
| 5 | Ed van Eeden | Piet Kooiman | 1−0 |
| 6 | Piet Kooiman | Abs with msg | |
| 7 | Piet Kooiman | Abs for club | |
| 8 | Piet Kooiman | Roger Feytens | ½−½ |
| 9 | Piet Kooiman | Harm−Theo Wagenaar | 1−0 |
| 10 | Piet Kooiman | Abs with msg | |
| 11 | Piet Kooiman | Abs with msg | |
| 12 | Piet Kooiman | Abs with msg | |
| 13 | Rene ten Bos | Piet Kooiman | 1−0 |
| 14 | Piet Kooiman | Martijn de Haan | 1−0 |
| 15 | Stefan Vosshard | Piet Kooiman | ½−½ |
| 16 | Piet Kooiman | Abs with msg | |
| 17 | Piet Kooiman | Mika Kleibeuker | ½−½ |
| 18 | Piet Kooiman | Abs for club | |
| 19 | Marc Speijers | Piet Kooiman | 0−1 |
| 20 | Piet Kooiman | Ed van Eeden | 0−1 |
| 21 | Jaap van der Tuuk | Piet Kooiman | ½−½ |
| 22 | Harm−Theo Wagenaar | Piet Kooiman | ½−½ |
| 23 | Piet Kooiman | Abs with msg | |
| 24 | Piet Kooiman | Extern | |
| 25 | Piet Kooiman | Yorick de Kruik | 0−1 |
| 26 | Piet Kooiman | Abs with msg | |
| 27 | Thijs Oostveen | Piet Kooiman | 0−1 |
| 28 | Ton Mackaaij | Piet Kooiman | 0−1 |
| 29 | Mika Kleibeuker | Piet Kooiman | ½−½ |
| 30 | Piet Kooiman | Wout van Goor | 1−0 |
| 31 | Piet Kooiman | Jan Ackerman | 1−0 |