Julia's Fairies

No.579 (NP)

Nikola Predrag


Original Problems, Julia’s Fairies – 2014 (II): May – August

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

original – 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)

Solutions: (click to show/hide)

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:



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S. K. Balasubramanian
S. K. Balasubramanian
July 30, 2014 20:27

The disparate idea is shown very elegantly in the published problem andmore interestingly in example problem. Well done Nikola. I liked the idea that cheks are delayed because of disparate condition.

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