J. Kossak
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| New York op | 04/07/1993 | 1764 | United States |
| New York op | 04/??/1992 | 1595 | United States |
| Manhattan op | ??/??/1991 | 977 | United States |
| New York op | 03/??/1991 | 1538 | United States |
Most Played Openings as White
| ECO | Opening | Games |
| C02 | French, advance variation | 4 games |
| B44 | Sicilian defence | 2 games |
| A26 | English, closed system | 1 games |
| E67 | King's Indian, fianchetto with ...Nd7 | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| B82 | Sicilian, Scheveningen, 6.f4 | 3 games |
| E61 | King's Indian defence, 3.Nc3 | 2 games |
| B46 | Sicilian, Taimanov variation | 1 games |
| A33 | English, symmetrical variation | 1 games |


United States