Transpositions to the DDG

"Save the variation trees -- recycle openings!"
- DDGer
The DDG uniquely combines the French Defence and the Queen's Gambit Declined: White plays e4, d4 and c4; Black plays e6 and d5 -- the move order is irrelevant. Yet the DDG deserves to be handled as a separate opening because the positions that arise are most unusual.

Below are presented the most common and important transpositions to the DDG. The standard moves of the opening are in bold, a line that transposes to the DDG is in the normal font, and a rare, almost never played line is in italics. Be aware, your solid and peaceful opening may turn out to be the DDG!

The D31 variations of the QGD, in which Black plays a modest move c6 or Be7, thus avoiding the most critical lines, are splendid for an occasional DDGer.

A13/001. c4 e6 2. e4 d5 3. d4 English Opening
A18/001. c4 Nf6 2. Nc3 e6 3. e4 d5 4. d4 English, Flohr-Mikenas Variation
B01/00 1. e4 d5 2. d4 dxe4 3. c4 e6 Center Counter Game
B12/01 1. e4 c6 2. d4 d5 3. c4 e6 Caro-Kann Diemer-Duhm Gambit
C001. e4 e6 2. d4 d5 3. c4 French Defence
C00/171. e4 e6 2. d4 d5 3. Be3 dxe4 4. Nd2 Nf6 5. c4 Alapin French
C10/061. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bd7 (4... Nd7) 5. c4 French, Rubinstein Variation
D00/01 1. d4 d5 2. e4 dxe4 3. c4 e6 Blackmar Gambit
D00/06 1. d4 Nf6 2. Nc3 d5 3. e4 Nxe4 4. Nxe4 dxe4 5. c4 e6 BDG, Hübsch Gambit
D07/001. d4 d5 2. c4 Nc6 3. Nc3 e6 4. e4 QGD, Chigorin Defence
D301. d4 d5 2. c4 e6 3. e4 QGD
D31/071. d4 d5 2. c4 e6 3. Nc3 c6 4. e4 Semi-Slav, Marshall Gambit
D31/071. d4 d5 2. c4 e6 3. Nc3 c6 4. e4 dxe4 5. f3 Semi-Slav, Gunderam Gambit
D31/231. d4 d5 2. c4 e6 3. Nc3 Be7 4. e4 QGD, Charousek Variation
D32 1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. e4 QGD, Tarrasch Defence, Marshall Gambit
D50/02 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c5 5. cxd5 exd5 6. e4 QGD, Dutch-Peruvian Gambit
E20/19 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3 d5 5. e4 Nimzo-Indian Defence, Kmoch Variation