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Problem 806: Franz Pachl & Ralf Kraetschmer - Fairy (Circe, neutral pieces)
franz.pachlralf.kraetschmer(27.01.2017) Excellent fairy problem with Circe effects and neutral pieces.
a) 1...d1R 2.nPb4xa5(+nPa7) Rd3 3.exd3(+Ra8) Rb8 4.nPa8nR+ Rxa8(+nRh1)#
b) 1...d1B 2.dxc5(+nPc7) Bxe2 3.Sxe2(+Bc8) Bd7 4.nPc8nB+ Bxc8(+nBf1)#
c) 1...d1S 2.axb4(+nPb7) Se3 3.fxe3(+Sb8) Sd7 4.nPb8nS+ Sxb8(+nSg1)#
Circe: Captured units (not Ks) reappear on their game-array squares, of the same colour (pieces), on the file of capture (pawns), or on the capture file’s promotion square (fairy pieces). If the rebirth square is occupied the capture is normal. 
Neutral piece (n): A unit with this characteristic may be regarded as of either colour by the side whose turn it is to play. Neutral pawns promote to neutral pieces.


0 #1 Ganapathi 2017-02-06 05:55
In a) after 3.e:d3(+Ra8), Black can move the R to other squares than b8 and even then the mate will take place, is it not?
Whereas in b) and c) the black moves Bd7 and Sd7 have no other possible squares to move to.
+1 #2 Diyan Kostadinov 2017-02-11 16:01
Ganapathi, in a) the bR should be on b8 to block the neutral Rook a8 to move on 8th rank by black after the check.
+1 #3 Ganapathi 2017-02-12 06:47
Thank you for pointing out the subtle idea behind Black's 3....Rb8 so that R:b8 is forced!

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