78-Problem Solution (Mate in 3)

Solution: 1. Qf4! [2. Qc4, Qb4, Qxe3#]
1. ... Bd4 2. Qxd2 [3. Qb4#]
2. ... Bc3+ 3. Qxc3#
1. ... Bxf4 2. Bf2+
2. ... Be3 3. Bxe3#

White Queen sacrifice will defeat Black defenses.