J. Effertz
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Porz op 25th | ??/??/1990 | 278 | Germany |
| NRW-Liga II | ??/??/1988 | 194 | Germany |
| NRW-Liga II | ??/??/1987 | 129 | Germany |
| Bundesliga 8485 | 10/??/1984 | 1639 | Germany |
Most Played Openings as White
| ECO | Opening | Games |
| C69 | Ruy Lopez, exchange variation, 5.O-O | 2 games |
| B30 | Sicilian defence | 2 games |
| C01 | French, exchange variation | 1 games |
| B22 | Sicilian, Alapin's variation (2.c3) | 1 games |
Most Played Openings as Black
| ECO | Opening | Games |
| D34 | Queen's Gambit Declined, Tarrasch, Prague variation, 7...Be7 | 2 games |
| D05 | Queen's pawn game | 1 games |


Germany