Fairy chess composition

No.579 (NP)

 No.579 Nikola Predrag(Croatia) Original Problems, Julia’s Fairies – 2014 (II): May – August   →Previous ; →Next ; →List 2014(II) Please send your original fairy problems to: julia@juliasfairies.com

No.579 by Nikola Predrag – Interchange of functions with good use of Disparate effects! (JV)

Definitions:

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”. (This way it is implemented in Popeye. Another implementation of Disparate you can find in WinChloe, but it is based on the different rules. )

 No.579 Nikola PredragCroatiaoriginal – 25.07.2014 Hint: (click to show/hide) White Ke8 Rd1 Bf6 Ba2 Pb2 Black Kd4 Rc5 Rd3 Be5 Be4 Pc6 Pe3 Pf3 h#2           2 solutions          (5+8)Disparate (Py) Single-check is stronger than double-check Solutions: (click to show/hide) 1.Rd3-b3 Bf6-d8 + 2.Rb3-b6 Bd8*b6 # 1.Be5-g3 Rd1-h1 + 2.Bg3-h4 Rh1*h4 # { (C+ by Popeye 4.67)} bRd3/bBe5 are only "virtually" pinned because they can depart from the virtual pinning-line without a real self-check. But the departure will result with a "virtually delayed self-check" which will become a real check and finally checkmate. A "virtualy pinned" black piece A must sacrifice itself on the unique square to allow a real pin of its sibling-piece which could otherwise paralyze the mating piece. The "virtual pin" of the other black piece B will be changed in the reality into a paralysis of its sibling, which could otherwise reoccupy the initial square of piece A. (Author) The motivation for black sacrifice is brutal, to prevent a paralyzing move by the annihilated piece. But the exact choice of a square of sacrifice is much more subtly motivated, presenting the reciprocity of bRc5/bBe4, within the long cyclic relation of 6 pieces (2W+4B) in each phase with a cyclic shift between the phases. Disparate offers a concept (at least virtual) of “delayed mixed battery” 🙂 More subtlety and complexity of the idea could be achieved with fairy pieces. Here is an original example which would probably look better on the board 8×10 instead of the twinning: (Author)

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