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Chess Problem 2001c5e501

BDS

Problemkiste, 2001

4S3/1*2B6/4p1B1/*2R1K1k3/1*2R6/3pP3/1*2B*2bP4/4*2r3

#3
ROOK-HOPPERs a5, b4; e1:
BISHOP-HOPPERs b7, b2; c2 

1.Bh7!  ()

1...RHe4 2.Kc6 & 3.BHd5#
1...BHe4 2.Kc4 & 3.RHd4#

After (and before) a makeshift key, Black has only two moves. Each one occupies e4 and stops the other one from occupying it on Black's second move. If they could be played, those second moves would make White's threatened mating moves illegal because of self-check.

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