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Chess Problem 2014c5c301

BDS

The Problemist, 2014

*3B3b2*3B/p4p2/p1*3s1p*3s1*3b/P1Kpp3/1P6/1*3Rk5/5p1*3b/1s6

R#2
PAO b3:
VAOs a8, h8; h6, h2:
MAOs c6, f6 

1.VAg7!  (2.VAf8 MAe4#)

1...MAxa5 2.b5   MAxb3#
1...MAe7  2.VAh8 VAf8#
1...MAd8  2.PAa3 MAb7#
1...MAb8  2.VAc6 MAd7#
1...VAg1+ 2.Kd6  VAf4#
1...d4    2.PAb2 VAe3#

The key threatens the unpin of the bMAf6, allowing it to mate. The bMAc6, by uncovering a guard on e4 by the wVAa8, has four defences with mixed strategy, one involving a switchback of the key piece.

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