Middlegame
In the English opening this line became popular: 1.c4 Nf6 2.Nc3 e6 3.e4 c5 4.e5 Ng8 5.Nf3 Nc6 6.d4 (this is the critical move: White tries to take advantage of his development at the expense of a pawn) 6...cxd4 7.Nxd4 Nxe5 8.Ndb5 a6 9.Nd6+ Bxd6 10.Qxd6 f6 11.Be3 Ne7 12. Bb6 (looks like it wins the Q) Nf5 and now both 11.Qc5 and 11.Bxd8 give White an advantage of only 2.4%.