Games played by Pieter Claesen
| White | ELO W | Black | ELO B | Result | Moves | ECO | Date | Tournament | View |
| Southam, T | 2285 | Claesen, P | 1-0  |
25 | D15 | 1988 | Wch U20 |
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| Adla, D | 2340 | Claesen, P | 1-0 |
41 | D17 | 1988 | Wch U20 |
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| Norwood, D | 2470 | Claesen, P | 1-0 |
56 | A07 | 1988 | Wch U20 |
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| Ballmann, M | 2275 | Claesen, P | ½-½ |
15 | C17 | 1988 | Wch U20 |
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| Claesen, P | McCann, K | 1-0 |
41 | A18 | 1988 | Wch U20 |
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| Claesen, P | Canfell, G | 2245 | ½-½ |
59 | E70 | 1988 | Wch U20 |
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