Games played by Stefan Kowalczyk
| White | ELO W | Black | ELO B | Result | Moves | ECO | Date | Tournament | View |
| Kowalczyk, S | Tates, T | 1-0  |
49 | B52 | 1998 | Hengelo U16 op |
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| Kowalczyk, S | Lesger, M | 1-0 |
23 | B51 | 1998 | Hengelo U16 op |
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| Kowalczyk, S | Gerritse, Y | 1-0 |
20 | B00 | 1998 | Hengelo U16 op |
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| Kowalczyk, S | Beekhuis, M | 1-0 |
70 | C45 | 1998 | Hengelo U16 op |
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| Monteban, M | Kowalczyk, S | 0-1 |
74 | D55 | 1998 | NED-ch U16 |
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| Molinari, G | Kowalczyk, S | 1-0 |
41 | C41 | 1997 | NED-ch U14 |
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| Groenhuis, V | Kowalczyk, S | 0-1 |
60 | C45 | 1997 | NED-ch U14 |
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| Erwich, F | Kowalczyk, S | 1-0 |
25 | B07 | 1997 | NED-ch U14 |
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| Kowalczyk, S | Koster, R | ½-½ |
59 | B07 | 1997 | NED-ch U14 |
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| Sparenberg, E | Kowalczyk, S | 0-1 |
50 | C41 | 1997 | NED-ch U14 |
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| Kowalczyk, S | Van Beek, G | ½-½ |
42 | A84 | 1997 | NED-ch U14 |
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| Kowalczyk, S | Castellani, S | ½-½ |
38 | E11 | 1997 | NED-ch U14 |
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| Kowalczyk, S | Lahaye, R | 1-0 |
37 | A37 | 1997 | NED-ch U14 |
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| Van der Heyden, A | Kowalczyk, S | ½-½ |
22 | E57 | 1997 | NED-ch U14 |
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