No.394 (PH) – Julia's Fairies

No.394
Peter Harris (South Africa)

Original Problems, Julia’s Fairies – 2013 (III): September- December

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No.394 by Peter Harris – Two neutral pieces, two fairy conditions and two solutions! (JV)

Definitions:

Sentinels Pion neutre: When a piece (Pawn excluded) leaves a square outside the first and last rows, a white piece leaves a wP, a black piece leaves a bP and a neutral piece leaves a nP unless 8 Pawns of that color are already on the board.

Super-Circe – When captured, a piece is reborn on any free field on the chess board without causing self-check or selfmate. Possible is also removal of captured piece from the board. The Pawns (white, black, neutrals, half- neutrals) can be reborn on the first or eight row also. When reborn on the first row (for Black) or on the eight row (for White) the promotion is obligatory. When reborn on the first row (for White) or on the eight row (for Black) the Pawns are immovable.

No.394 Peter Harris

South Africa

original – 19.10.2013

h=2 (0+0+2n)
Sentinelles Pion Neutre
Super-Circe

Solutions: (click to show/hide)

beg pie neu ka2 pa3 stip h=2 cond supercirce sentinelles pionneutre end 1.nKa2-b2[+nPa2] + nKb2*a3[+nPb1=nR][+nPb2] + 2.nRb1*b2[+nPb3] nPa2*b3[+nPa1=nB] = 1.nKa2-b2[+nPa2] + nKb2*a3[+nPb8=nR][+nPb2] + 2.nRb8*b2[+nPb3] nPa2*b3[+nPa1=nB] =

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Julia

October 19, 2013 21:42

Surprising problem as always from Peter!
But here I have correct solution by Popeye 4.61 (and Peter – by Popeye 4.47!), but something strange by Popeye 4.63:
one solution is correct, another one is a cook which seems to be a mistake in a program, and for some reason the 2nd solution is absent at all – looks like:

—
Maybe anyone could find out what’s a problem and if something should be reported to Popeye’s team? Thanks!

Eric

October 20, 2013 21:48

It has already been reported to the Popeye development team that the latest Popeye v4.63 has trouble handling neutral pawns with some fairy conditions: within the same move Popeye treats such a pawn both as black and as white (in the present problem, nPa3 is captured by nK and reborn at b1 as nR and at b8 as nR too).
The same issue occurs with other fairy conditions of the Circe family.

As far as I know, Thomas Maeder & Co. are working on fixing these bugs (and have already fixed many of them in the new beta version). We must be patient until the next release.