J. Mattson
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Philadelphia Int 4th | 06/25/1993 | 1379 | United States |
Most Played Openings as White
| ECO | Opening | Games |
| A80 | Dutch | 1 games |
| B07 | Pirc defence | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| A55 | Old Indian, main line | 1 games |


United States