Chess Opening Theory/1. e4/1...Nf6/2. e5/2...Nd5/3. c4/3...Nb6/4. d4
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White has occupied the center with pawns. From here, white can choose how to reinforce his pawn structure.
1.e4 Nf6 2.e5 Nd5 3.c4 Nb6 4.d4
||+- Black loses a knight.|
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