Games played by Alexander Jongsma
| White | ELO W | Black | ELO B | Result | Moves | ECO | Date | Tournament | View |
| Jongsma, A | Forintos, G | 0-1  |
1958 | WchT U26 prel-C 05th |
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| Makelainen, | Jongsma, A | 0-1 |
23 | A34 | 1957 | Wch U20 |
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| Gerusel, M | Jongsma, A | 1-0 |
66 | A61 | 1957 | Wch U20 |
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| Hallerod, R | Jongsma, A | 0-1 |
48 | B33 | 1957 | Wch U20 |
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| Bates, R | Jongsma, A | 0-1 |
52 | A88 | 1957 | Wch U20 |
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| Jongsma, A | Jobin, G | 1-0 |
40 | B72 | 1957 | Wch U20 |
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| Jongsma, A | Bahgat, | 1-0 |
33 | B60 | 1957 | Wch U20 |
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| Jongsma, A | Cardoso, R | 1-0 |
65 | E62 | 1957 | Wch U20 |
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| Jongsma, A | Lombardy, W | 0-1 |
34 | A24 | 1957 | Wch U20 |
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| Jongsma, A | Selimanov, | ½-½ |
79 | A16 | 1957 | Wch U20 |
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| Jongsma, A | Rabinowitz, B | 1-0 |
37 | D78 | 1957 | Wch U20 |
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| Aldrete, J | Jongsma, A | 0-1 |
36 | B55 | 1957 | Wch U20 |
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