BDS
diagrammes, 1990
#2
LEOs d4; a6, b1
PAOs e1, g6; b2, d3
VAOs f2; a2, a3
1.PAg5! (2.Sg6#) 1...PAd1 2.Se2# (2.PAf1? LExf1!) 1...PAd2 2.PAf1# (2.Se2? PAxe2!) 1...Rb3 2.LEd6# (2.Se6? VAxe6!) 1...Rb4 2.Se6# (2.LEd6? VAxd6!) 1...Rxf6 2.LExf6# 1...Rb5 2.Se6, LEd6, Se2, PAf1#
After the key there are two pairs of dual avoidance variations. In each case a black piece moves away to open a line of guard to the threat square from a black Chinese Piece, seemingly allowing two mates, but each black move carries a compensating arrival hurdle-creation feature which eliminates one of the mates. Of course, the quadruple dual of all four thematic mates after 1...Rb5 is a huge flaw.
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