Bill Costaras
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Detroit Motor City opA | ??/??/1994 | 78 |  United States |
| Troy MI Classic-M | ??/??/1993 | 892 | United States |
| Ohio-ch qual | ??/??/1980 | 0 | United States |
| Fischer tour simul | 03/??/1964 | 0 | United States |
Most Played Openings as White
| ECO | Opening | Games |
| C05 | French, Tarrasch, closed variation | 1 games |
| C77 | Ruy Lopez, Morphy defence | 1 games |
| B07 | Pirc defence | 1 games |
| B06 | Robatsch (modern) defence | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| A34 | English, symmetrical variation | 1 games |
| A57 | Benko gambit | 1 games |
| C64 | Ruy Lopez, classical (Cordel) defence | 1 games |
| E74 | King's Indian, Averbakh, 6...c5 | 1 games |
