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Chess Problem 2015h3h501

BDS

The Problemist, 2015

8/7p/7p/1*3RS*3sS2k/8/7K/6R1/7*3b

#2
PAO b5:
VAO h1:
MAO d5 

1.PAa5! ()

1...MAc3 2.Sc4#
1...MAe3 2.Se4#
1...MAe7 2.Se6#
1...MAc7 2.Sc6#

Black can only move his MAO, but wherever he moves it, it is cut off by one of the white knights on the potential half-battery line so that it cannot return.

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