You see right away that Black’s king and queen are aligned. You see that White’s bishop is aimed through them. You see that there is a Black pawn in the way. The question is how to get rid of it. You can’t take something the pawn protects because it doesn’t protect anything. On the other hand, you do have another piece—your queen—which can do whatever the bishop can do. So this pawn can be handled in direct fashion: just take it. White plays Bxf6+, and after the recapture KxB White’s queen has room to take over the skewer with Qh4+. Once Black’s king moves, White plays QxQ and wins. Notice that in addition to removing the pawn, White’s initial Bxf6 has the effect of drawing Black’s king forward so that it no longer can protect his queen. This is a useful idea that we will consider in more detail in a little while (see 4.5.10.3.).