BDS
feenschach, 1990
H#2
2 solutions
PAO c6
VAO c3
1.VAa1 Sb2 2.VAxd4 Sxd4# 1.PAa6 Sb6 2.PAxd6 Sxd6#
If a4 were guarded and the wPs d4 and d6 were missing, White could mate on those latter squares with the wSf5. In each solution, a black Chinese Piece retreats over a critical square, which the wSc4 then moves to. From here it guards a4 and provides a hurdle over which the Chinese Piece can capture the wP, allowing the wS to mate.
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