| Interne Competitie SENIOREN |
| Senioren - Piet Kooiman |
| Site | Boorstraat | Start date | 25-10-2022 |
| City | Utrecht | End date | 31-5-2023 |
| Country | Netherlands | Pairing system | Swiss |
| Organization | Schaakvereniging Oud Zuylen Utrecht | Arbiters | Marc Jongerius |
| Piet Kooiman | |
| Rating | 1885 |
| Nr. | White | Black | Result |
| 1 | Piet Kooiman | Abs with msg | |
| 2 | Piet Kooiman | Abs with msg | |
| 3 | Piet Kooiman | Abs with msg | |
| 4 | Piet Kooiman | Abs with msg | |
| 5 | Harm Theo Wagenaar | Piet Kooiman | 1−0 |
| 6 | Piet Kooiman | Bastiaan Vedder | 1−0 |
| 7 | Piet Kooiman | Ed van Eeden | 0−1 |
| 8 | Guus van Eeden | Piet Kooiman | 1−0 |
| 9 | Piet Kooiman | Abs with msg | |
| 10 | Piet Kooiman | Abs with msg | |
| 11 | Piet Kooiman | Abs with msg | |
| 12 | Piet Kooiman | Abs with msg |