There are two things you should see as soon as you lay eyes on this position. First, the Black bishop and queen are lined up on the same rank; enemy pieces on a line with nothing between them always suggest the possibility of a pin or skewer. Second, the bishop on a5 is protected only by the queen; this too should cause you to think about a skewer. The pattern is structurally the same as the previous position: the bishop will become loose if the queen is driven off, and so will be a safe and suitable target for a capture by any skewering piece. White thus plays Re5, where the rook attacks the queen with protection from the knight on f3. The queen must move, and it has no place to go where it can keep protecting the bishop. Now White plays RxB and wins the bishop for nothing.