 No.480 Nicolas Dupont (France) |
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No.480 by Nicolas Dupont – A difficult PG problem with a Back Home fairy condition, invented by author! The problem will participate in the Tournament for Retro and PG problems published at Julia’s Fairies in 2013 – 2014. (JV)
Definition sent by author:
Back-home:
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.
See the link https://juliasfairies.com/articles/back-home-fcondition-ndupont/ for more details on the back-home fairy condition.
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No.480 Nicolas Dupont
France
original-06.01.2014
Dedicated to Jacques Dupin
 PG 21,5 (15+15)Back Home
Solution: (click to show/hide)
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Very nice thematic content. It is a real surprise to see that all black men can be outside their original squares despite the Back-Home condition!
I doubt if it can be done in a shorter PG. You have used only 5 moves extra ! The white knight circuit is a great addition to the main idea.
Thanks! It could be a nice challenge to construct a back-home proof game as short as possible, where none of the 16 officers are standing on their initial squares in the diagram position.
Thank you very much Nicolas ! Many (all of them?) methods used to avoid returns. One can also note a nice cameleon-echo for the Rooks… Bravo!
There are other subtle methods to avoid returns – but still a very fine and clear proofgame!