Original Problems, Julia’s Fairies – 2013 (III): September- December
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No.472 by Petko A. Petkov – Another excellent Disparate problem from Petko with a New Year Greetings to all of us! Enjoy also detailed author’s comments!
Thank you, Petko! (JV)
Disparate: If one side makes a move with a piece of type “x” (black, white, neutral, half-neutral, etc., King included), the other side cannot answer immediately by moving a piece of the same type “x”. (For example: white Qc1, black Ka8,Qa7 – mate in 1 move. After 1.Qc8#, Black is mated because 1…Qb8? is illegal. The mate is possible also with the neutral nQc1 – after 1.nQc8#. Black cannot move the same neutral Queen.) Every Pawn’s promotion is a Pawn’s move, therefore after such promotion (into any possible piece) the other side cannot answer immediately with its Pawn. We can say that after the move of the figure of type “x” any enemy figure of type “x” falls under Half-moving paralysis. This paralysis disappears immediately on the next half-move, if the opponent plays with another piece of type “y”.
Important note: Disparate condition is not included in Popeye‘s manual, but it is implemented there and can be used as “Disparate“.
Another version of Disparate you can find in WinChloe, but it is based on the different rules.
VAO(VA): Moves as Bishop, but captures only by hopping over a hurdle to any square beyond.
PAO(PA): Moves as Rook, but captures only by hopping over a hurdle to any square beyond.
NAO(NA): Moves as Nightrider, but captures only by hopping over a hurdle to any square beyond.
Nightrider(N): (1,2) Rider. Operates along straight lines with squares lying a Knight’s move away from each other.
No.472 Petko A. Petkov
original – 31.12.2013
New Year Greetings
to our lovely fairy editor Julia Vysotska
and to all other authors and readers of this site!
b) Ka5→b2; c) nPAf4→e2
VAO g6; PAO f4; NAO b5
Solutions: (click to show/hide)
a) 1.nNAb5-d6 nPc7-c8=nNA 2.nVAg6-d3 nNAd6-b2 = !! – Stalemate with two pinned nPA/nVA (AB) and two paralyzed for Black nNAOs! Thematic try: 1.nVAd3? c8=nNA? 2.nNAd6?? but now the nNAd6 is paralyzed for White and impossible is 2…nNb2=?? (Pay attention that no Disparate half-moving paralysis is possible, for example, after 1. nNAd6? nVAd3 2.nNAb2? c8=nNA?? – it is not stalemate because the last white move is a Pawn move and both nNAs are not paralyzed!!)