ppetkovNo.575 
Petko A. Petkov 
(Bulgaria)

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

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No.575 by Petko A. Petkov – Author has sent this problem to illustrate some important moments of a play in Disparate-problems, in particular, how to create tries and anti-duals. (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. )

PAO(PA): (0,1) Chinese. Chinese piece operating along Rook lines: moves as Rook, but captures only by hopping over a hurdle to any square beyond.

VAO(VA): (1,1) Chinese. Chinese piece operating along Bishop lines: moves as Bishop, but captures only by hopping over a hurdle to any square beyond.


No.575 Petko A. Petkov
Bulgaria

original – 23.07.2014

Hints: (click to show/hide)

white Kf1 black kh8 qd8 sd4 sh4 bg8 vac8 pae8 pa3 pb7 pf2 pg3 neutral vac1 pag1

h#2       2 solutions    (1+11+2)
Disparate (Py)
PAOs: e8, g1; VAOs: c1, c8

Solutions: (click to show/hide)


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seetharaman
seetharaman
6 years ago

Very nice effects. I like it that though the mating move is only a single check, black cant defeat it moving neither nPao or NVao!