Hart-Enders, 1936
The King is "Checked and Forced" into position.
2) qg7+ rg7
The Queen Sacrifice, the purpose of which is Pawn Removal.
3) nf6+ kh8
The King is once again"Checked and Forced" into position with the Knight check gaining tempo. I call this the "Poscheck" move.
4)hg+ kg7
This is the actual clearance move, Self Clearance With Check--you will note that now the H file is open and the Rook is exerting its long range laser beam on the entire file--and the King is yet again Check and Forced into the mating square.
5)Rh7 mates. This is a "Rook and Knight Mate." It is also a Boxmate" because it occurs withing the king's own castle.
