Mark M Sefcheck
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Cardoza US op | 08/??/1998 | 1144 |  United States |
| USA-op | 08/??/1994 | 374 | United States |
| Chicago Master challenge 11 | ??/??/1989 | 269 | United States |
Most Played Openings as White
| ECO | Opening | Games |
| D20 | Queen's gambit accepted | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| D31 | Queen's Gambit Declined, 3.Nc3 | 1 games |
| B94 | Sicilian, Najdorf, 6.Bg5 | 1 games |
