The initial visual clue here is about the same as in the previous problem; see it, or simply ask what checks White’s bishop has. There is Bg6, attacking nothing else, and Bc6, attacking the bishop at b7—an unsuitable target that also guards the forking square. So again White exchanges the unsuitable target for a suitable one by capturing it and inviting recapture by Black: 1. RxB, NxR, and the bishop has been replaced by a knight that is loose and that cannot defend c6. Now 2. Bc6+ picks up the knight, winning two pieces for a rook.