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Chess Problem 2010a8f601

BDS

The Problemist Supplement, 2010

K7/8/5k2/7*1R/8/8/3*1Q4/3*1B4

SER-H#13
SIREN d2:
TRITON h5:
NEREID d1 

1.Ke7 2.Kd8 3.Kc7 4.Kb6 5.Ka5 6.Ka4 7.Ka3 8.Ka2
9.Kb1 10.Kc1 11.Kxd1 12.Ke1 13.Kf1 TRh1#

To be mated, the black king must get to f1, but first he has to cross the paths of the white Siren and Triton. It can only do this at the board edge so that there is no square beyond it for the capturing piece to land. The Nereid is needed to ensure that 7.Kb3 isn’t an alternative to 7.Ka3.

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