Chess Opening Theory/1. d4/1...d5/2. c4/2...Nf6
A rarely seen opening at the higher levels of chess. Black's knight defends the d5 square, but if white exchanges pawns, it is not too difficult to later gain a tempo by attacking the piece on d5.
1. d4 Nf6 2. c4 d5
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- Batsford Chess Openings 2 (1989, 1994). Garry Kasparov, Raymond Keene. ISBN 0-8050-3409-9.