J. Koc
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| RUS-UKR m | ??/??/1957 | 0 | |
| UKR-ch | ??/??/1957 | 0 |
Most Played Openings as White
| ECO | Opening | Games |
| C90 | Ruy Lopez, closed (with ...d6) | 1 games |
| E95 | King's Indian, orthodox, 7...Nbd7, 8.Re1 | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| E28 | Nimzo-Indian, Saemisch variation | 1 games |
| E60 | King's Indian defence | 1 games |
