1.Sc5! -

1...e2 (~) 2.Qe4#

1...exd2 2.Re4#

1...Bd3 2.dxe3#

1...Rd3 2.Qa4#

1...gxf6+ 2.Bxf6#

1...bxc5 2.Bxc5#

1...d5 2.Se6#

1...Bg2 2.Se2#

7th WCCT theme 4x2 (Hartong, Grimshaw, decoy, diversion). Clearance sacrifice key.