Chess Opening Theory/1. e4/1...Nf6/2. e5/2...Nd5/3. d4/3...d6/4. c4/4...Nb6/4. f4
White has built a huge pawn center. Black will try to destroy it from a distance. It would be a good idea to exchange the d pawn so as to weaken the king side : 4...dxe5.
A more quiet line is : 4...Bf5, developping the bishop
'1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.c4 Nb6 5.f4'
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