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Chess Problem 2010h4e301

BDS

12th Comm., Die Schwalbe, 2010

6s1/6R1/8/1p5p/p3*3R*3B1K/3BkS2/2P1S1P1/1*3r2B*3r1*3b

#3
PAOs e4; b1, f1:
VAOs f4; h1 

1.Rg3! (2.Sfd4+ PAf3 3.Sf5#)

1...Se7 2.Se5+  PAf3 3.PAxe7#
1...Sh6 2.Sg5+  PAf3 3.VAxh6#

The strong key threatens a line ending in mate on f5. Black twice defends by guarding that square with his knight. White can then continue by setting up an anti-battery that needs to capture something to operate.

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