4.Bf4 – is called the Miles Variation, after the English grandmaster Tony Miles (1955–2001), who often played this system at the end of the 1970s. White simply wants to continue his development, without having the ambition to contest the e4-square. After 4...Bb7 5.e3 Be7 he has to invest a tempo in 6.h3 to also prevent the exchange of the bishop by ...Nh5. The moves 6...c5 7.dxc5 bxc5 8.Nc3 0-0 9.Be2 d6 result in a structure in which White has at his disposal the semi-open d-file and Black the semi-open b-file.
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