Chess Opening Theory/1. e4/1...c5/2. c3/2...Nf6/3. e5/3...Nd5/4.d4
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This move gains central space and connects with the e-pawn. White has create a pawn chain in the conter and is now threatening c4 followed by d5, when Black would really suffocate by his lack of central space. This pawn controls White's center.