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Chess Opening Theory/1. d4/1...e6/2. c4
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Queen's Pawn Opening
2. c4
White keeps the game in the realm of Queen pawn openings with this move. Most responses (like 2...Nf6 or 2...f5) transpose to other openings.
A unique opening order is 2...Bb4+, the Keres Defense. This is usually also a transpositional tool, usually transposing into the Bogo-Indian Defense after 3.Bd2. However, even 3. Nc3 (then transposing into the Nimzo-Indian Defense) or 3. Nd2 (a unique order, but can transpose into the Bogo-Indian Defense) are both playable.
Theory table
.
1. d4 e6 2. c4
2
...d5
Nc3Nf6
= to 1...d5 2. c4 e6
...Nf6
Nf3d5
= to 1...Nf6 2. c4 e6
Keres Defence
...Bb4+
=
English Defence
...b6
=
Dutch Defence
...f5
=
References
Queen's Pawn Game
Nunn's Chess Openings. 1999. John Nunn (Editor), Graham Burgess, John Emms, Joe Gallagher. 1-8574-4221-0.
Modern Chess Openings: MCO-14. 1999. Nick de Firmian, Walter Korn. 0-8129-3084-3.