White's knight move is for "Self Clearance."
2) ne7+ qe7
Black's Queen is forced to capture the knight which is forking the King and Rook. The Queen has been forced into a pin.
3) qf5 f5
Black's move was an Clearance Exchange, Exchange Sacrifice, Clearance Sacrifice, and Queen Sacrifice all in one.
4) re7 wins the q
