Greco published this idea in the early 1600s; it is more or less the same as the previous position but one move earlier. Black’s most natural move to consider is the check 1. …Qxf2+, planting the queen safely next to White’s king and driving it toward the corner. The problem is that after White replies 2. Kh1, Black can’t safely play his queen to the back rank because White guards it heavily. So instead Black plays it there unsafely with a charming sacrifice: 2. ...Qg1+, requiring White to play RxQ or NxQ. Now White’s king again is confined and ready to be mated with Nf2#.