opening - Ruy Lopez exchange variable - Chess Stack Exchange

In the exchange variation of Ruy Lopez, why doesn't black capture using the B-pawn? As per good strategy shouldn't we capture towards the center of the board?

This pawn structure usually arises after 1.e4 e5 2.Nf3 Nc6 3.Bb5 from one of the following lines: A) 3 a6 4.Bxc6 (Exchange Spanish) B) 3a6 4.Ba4

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