Nicolas Dupont


Original Problems, Julia’s Fairies – 2014 (I): January – April

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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:

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  for more details on the back-home fairy condition.

No.480 Nicolas Dupont
Dedicated to Jacques Dupin
480-PG21,5-ndPG 21,5                                     (15+15)
Back Home 
Solution: (click to show/hide)

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January 8, 2014 11:15

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!

January 10, 2014 06:46
Reply to  seetharaman

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.

January 8, 2014 12:56

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.

Jacques Dupin
Jacques Dupin
January 9, 2014 21:17

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!

Kjell Widlert
Kjell Widlert
January 10, 2014 00:05
Reply to  Jacques Dupin

There are other subtle methods to avoid returns – but still a very fine and clear proofgame!