Original Problems (page 110)
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No.175 – h#3 by Petko A. Petkov – Non-standard pin-mates with blocks of mating piece – neutral MOA! (JV)
MOA(MO): the Chinese knight, which is a Rider, moving along a bent line to the arrival square of a normal Knight, first diagonally then orthogonally. The MOA can be interfered with on the intervening square.
Nightrider(N): A Rider along a straight line on squares lying a Knight’s move away from each other.
No.175 Petko A. Petkov
h#3 b) Kh4->g7 (5+8+2n)
MOA d3, d7
Solutions: (click to show/hide)
a) 1.Sc7! nNe6 2.Sb5 nNa8!! 3.Sa7! nMOxb6 # (4.nMOxa8? – impossible because Sa7 closes the MOA-line!)
b) 1.MOf2! nNf4 2.MOg4 nNg6!! 3.MOf6 nMOxe5 # (4.nMOxg6? – impossible because MOf6 closes the MOA-line!)
c) 1.Sf6! Kg5 2.Sg4 nNg2!! 3.Sf2 nMOxe3 # (4.nMOxg2? – impossible because Sf2 closes the MOA-line!)
Three surprising Ambush-moves of the neutral Nightrider which pins the mating piece – neutral MOA! The paradox here is that the neutral MOA can’t capture the pinning nN because it is specifically closed by the black piece. Model mates with pinned neutral MOA. This combination is probably new. (Author)
The diagrams are made on WinChloe and its Echecs font is used for Logo design