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Chess Problem 2021e4c401

BDS

The Problemist, 2021

7*3b/4*3r3/P1B2*3s2/1*3R1S1*3Q2/1Pk1K*3rp1/2p2S2/6*3s1/8

#2
LEO f5
PAOs b5; e7, f4
VAO h8
NAOs f6, g2 

1.Ke3!    (2.LEc2#)

1...PAfe4+ 2.LEe6#
1...NAe4+  2.Se5#
1...PAee4  2.LEc8#
1...c2     2.Sd2#

The white king, in making the key, vacates e4, which is then occupied three times by Black, twice with check from the bPAe7. Mates follow the checks with White occupying newly-unguarded squares on the check line.

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