1.dc6 ... isn't it?
A simple(?) mate in 2
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Black has no last move, so it's his turn to move.
If cxd5, then c6 with mate on c7, or after dxc6 White plays Nxc6#.
If d6, then Nxc6#.
1. dxc6 dxc6 2. Nxc6#
If 1. dxc6 d6 2. c7#
Mate in 2.
Janis Lukasevics
Problem Paradise 22, 2002