Fairy chess composition

# No.883 (GG)

 No.883 Gani Ganapathi (India) Original Problems, Julia’s Fairies – 2015 (II): July – December    →Previous ; →Next ; →List 2015(II) Please send your original fairy problems to: julia@juliasfairies.com

No.883 by Gani Ganapathi – Tanagra with Disparate PY condition (can be tested either with Disparate in Popeye, or with Disparate PY in WinChloe). (JV)

Definitions:

Disparate PY: 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”. (“Disparate PY” is implemented as “Disparate” till the latest version of Popeye, PY 4.73. In WinChloe this version of Disparate is available starting version 3.32.)

 No.883 Gani GanapathiIndiaoriginal – 03.09.2015 Solutions: (click to show/hide) white Kc1 bd2 pc6 black kb8 bf4 hs#2          2 solutions         (3+2)Disparate PY 1.Bd2-e3 Kb8-a8 2.Be3-a7 Ka8*a7 # 1.Bd2-a5 Kb8-c8 + 2.Ba5-c7 Kc8*c7 # { (C+ by Popeye 4.73)} Interesting to note that in both solutions, while Whites's 2nd move paralyses Black B, Black is compelled to make its K move thus releasing his B to check and paralysing WK to get mated. (Author)

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