1...Qd3+!Black Queen threatens capture of White's Rook at b1 if White's King moves to e1, forcing Black Queen sacrifice saving Black's Bishop at d7 2.Kxd3Bxc6+discovered
attack/check (Black Bishop attacks White's Queen while Black Rook checks White's King) so Queen sacrifice gets White's Queen and a Bishop for the Black Queen,
with the added thrust of Black going from material disadvantage to material advantage along with now having a Bishop Pair and pawn up to a Bishop and a Knight with pawn down - a very effective discovered attack/check!
Antunac - Huebner
Dresden 1969
White to Move
1.Rc7!!threatening Rook takes
Black's Queen which is absolutely pinned (note that White's Queen is unguarded and thus White forces
a sacrifice of the White Queen) 1...Qxh5
2.Re7+Rook goes into "hog"
or "pig" attack mode gobbling up Black pieces, aided by discovered checks and back rank weakness. This
effects the "windmill" - discovered checks followed by normal checks followed by more discovered checks. 2...Kf83.Rxb7+Ke84.Re7+Kf85.Rxh7+Ke86.Rxh5
Mazuski - Kolisch
Paris 1863
White to Move
This is an example of applying Queen sacrifice to force a discovered check with following
mate in a line made famous by Paul Morphy's Opera Game at the Paris Opera House in 1858 (available for review in a later tutorial). 1.Qd8+!!the
Queen sacrifice starts the parade...Black's back rank weakness forces Black's King to capture White's Queen setting up the unstoppable discovered attack/check mating pattern and mating net. Morphy's mating line is a very artful example of the deadly consequences of not paying attention to King Safety and early castling. 1...Kxd82.Bg5+Ke83.Rd8#
