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Chess Problem 2000b5d501

BDS

Suomen Tehtäväniekat, 2000

1*1qS5/1p3s2/3pR3/*1bK1k1P*1b1/8/3P4/2*1B1S3/5s2

#2
SIREN b8
NEREIDs c2; a5, g5 

1.Re4!  (2.NDb3#)

1...Se3  2.Sf4#
1...Sd2  2.Sc3#
1...Sd8  2.Se7#
1...SIc7 2.Sb6#
1...Se5  2.Rd4#

The key vacates e6 in order to give the wND a square to land on in its threat to capture the bK. Black's first four defences block a square, so providing a shelter on an adjacent square for a white piece to mate on, safe from capture by a black Marine piece. The two NDs on black squares are a flaw.

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