| Name: | J. Ostaszewski |
| Federation: |  |
| Years: | 1990 - 1998 |
| Total Games: | 3 |
| Wins: | 1 (33.33 %) |
| Draws: | 0 (0 %) |
| Losses: | 2 (66.67 %) |
| Score: | 33.33 % |
| Tournament | Date | Elo Avg. | Country |
| Najdorf Festival op | 10/??/1998 | 1106 |  Argentina |
| Buenos Aires BCA op | ??/??/1990 | 931 | Argentina |
| ECO | Opening | Games |
| B32 | Sicilian defence | 1 games |
| B33 | Sicilian defence | 1 games |
| C13 | French, classical | 1 games |
| ECO | Opening | Games |
| White | ELO W | Black | ELO B | Result | Moves | ECO | Date | Tournament | View |
| Ostaszewski, J | Roman, F | 0-1  |
24 | B33 | 1998 | Najdorf Festival op |
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| Ostaszewski, J | Amura, C | 2350 | 1-0 |
20 | B32 | 1998 | Najdorf Festival op |
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| Ostaszewski, J | Zarnicki, P | 2475 | 0-1 |
24 | C13 | 1990 | Buenos Aires BCA op |
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