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BDS

Orbit, 2012

H#2
(b) wSIa1->e8
SIRENs a1; g5:
TRITON d6:
NEREIDs f5; d1

a) 1.Sc5 SIa5 2.SIe7 SIxd2-e1#
b) 1.Se6 SIc8 2.NDg4 SIxc2-c1#

In each solution, (1) a black knight moves off a line for the white SI and blocks the square beside the mating piece, protecting it from capture from a black Marine Piece that is not yet in position; (2) the white SI moves into position for its next move; (3) a black Marine Piece interferes between a black bishop and the mating piece and (4) the white SI captures a pawn next to the black king, uncovering mate from a white Marine Piece.