Nicolas Dupont (France)
Original Problems, Julia’s Fairies – 2013 (II): May – August
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No.332 by Nicolas Dupont – Author shows an example of his own condition – “Back Home” – with 4 interesting promotions (see an article “The back-home fairy condition – Nicolas Dupont“)! (JV)
Definition of the back-home fairy condition:
a) If a piece can legally move to the square it occupied in the initial position of the problem, it must move to this back-home square.
b) Back-home moves are prevalent to the virtual capture of the opponent King by any piece, i.e. “checks are fairies”.
c) If several back-home moves are legal, the side-on-move chooses which one to play.
d) The back-home square of a Pawn which is promoted during the solution is the initial square of this Pawn.
No.332 Nicolas Dupont
(C+ WinChloe 3.24)
Solution: (click to show/hide)
1.b1=B c7 2.Bf5 c8=Q 3.g1=Q Qg8 4.Qg2 d8=B#
Bishop/Queen promotions in Black/White echo form, with only Kings and the 4 thematic Pawns in the diagram position.
Of course my recent article introducing back-home should be known to understand this problem. Then everything should be clear (for example why 4…d8=Q is not a mating move, even not a checking move) except perhaps 3…Qg8.
Why White can’t play instead its back-home move 3…Qc6? The reason is the previous Black move g1=Q. This is not a check but disallows Qc6. Indeed after 3…Qc6+ Black can’t play its back-home move Qg2 as it would not parry the check, hence Black can “virtually” capture the White King!
Saying otherwise, the move 3…Qc6 is a self-check as it transforms the almost paralyzed Qg1 into an active piece…
I suggest as a task to construct such a back-home 4-Pawns problem, showing a bicolored AUW instead of promotions (B,Q,b,q). (Author).