J. Ducas
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| Sao Paulo | ??/??/1957 | 0 |  Brazil |
J. Ducas Repertoire with White pieces (most played)
| ECO | Opening | Games |
| D41 | Queen's Gambit Declined, Semi-Tarrasch, 5.cd | 1 games |
| A42 | Modern defence, Averbakh system | 1 games |
| C96 | Ruy Lopez, closed (8...Na5) | 1 games |
| B33 | Sicilian defence | 1 games |
J. Ducas Repertoire with Black pieces (most played)
| ECO | Opening | Games |
| A48 | King's Indian, East Indian defence | 1 games |
| D15 | Queen's Gambit Declined Slav, 4.Nc3 | 1 games |
| D17 | Queen's Gambit Declined Slav, Czech defence | 1 games |
| C50 | King's pawn game | 1 games |
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