As we have said, the current idea can be a bit harder to see in cases where the target is attacked twice and appears to be guarded twice, but where one of the guards is overworked and the extra protection it supplies therefore is illusory. In this example White has a possible capture in QxB. He can't play it because Black’s queen guards his bishop. So carefully examine what other work the queen is doing; follow its lines and examine everything it protects or seems to protect. The f7 pawn is the eye-catcher because White already attacks it twice (with his queen and bishop) and because it's next to Black’s king. The pawn appears to be guarded by both Black’s king and queen, but here as in the last position we remember that the king is a suspect defender of other pieces, and we already know that the queen has responsibilities elsewhere. So White plays 1. Bxf7+. Since it gives check the move can't be ignored. Black must play carefully, as White has three pieces closing in on his king against only two immediate defenders; if Black merely moves the king out of check (i.e, to h7 or f8), he will be mated soon. His best bet is QxB, removing one of the attackers. Now White plays QxBd6 and has gained a pawn—and will pick up the loose pawn on e5 with his queen a move later. White emerges with a material advantage and better position.

To keep the exposition manageable we mostly have been focusing on how enemy pieces are defended, not pawns. But as this position shows, of course, pawns make perfectly good targets as well and mustn't be overlooked.