White "selfclears" with a "Knight Sacrifice" to open up the vertical file. If Black decsacs, "declines sacrifice" White threatens to capture the Rook or to mate.
2) qh7+ kh7
The qsac, "Queen Sacrifice" is for the purpose of "Pawn Removal" The Black King has "Only 1" legal move.
3) rh3 is a a "Two Rook Vertical Scissors Mate."
