BDS
5th Comm., Phénix, 2018
R#2
VAO b2
PAOs d1,f6; b8,d8,e1
1.PAf8! (2.Qc7 PAxf8#) 1...d6 2.Qc5 PAxf8# 1...d5 2.Qxc4 PAxf8# 1...PAb7 2.PAf7 PAxf7# 1...PAb6 2.Vc1 PAf6# 1...PAb5 2.Rg5 hxg5# 1...PAxb2 2.f3 PAf2#
With the threat, White makes way for the bPAb8 to mate while also avoiding destinations from which it could interfere on the f-file. Black defends by moving the Pd7, which opens the wQ's guard on the f-file. So the wQ moves behind the bP after it has moved, so still allowing the threatened mate. The bPAb8 can defend the threat by moving anywhere on the b-file. These moves lead to three more mates on the f-file and a pawn mate on g5.
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