No.943 
Gani Ganapathi (India)

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Original Problems, Julia’s Fairies – 2015 (II): July – December

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No.943 by Gani Ganapathi – Paralysing pieces in reciprocal under-promotions. (JV)


Definition:

Paralysing piece: Moves as normal but cannot capture; instead it paralyses any enemy unit it attacks, so that this unit is unable to move, capture or give check, until the attack from the paralyzing piece ceases. At the mate the side being mated must have at least one move available before the notional capture of the King.


No.943 Gani Ganapathi
India

original – 29.10.2015

Solutions: (click to show/hide)

white Kc2 white paralysing Pb7 black Ke3 black paralysing Pg2

hs#3            2 solutions            (2+2)
Paralysing Pb7, Pg2


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seetharaman
seetharaman
4 years ago

Elegantly done !

Stephen Emmerson
Stephen Emmerson
4 years ago

If White takes a queen, it’s not mate: 4.Qb5/h5 or 4.Qe7 can be played. If Black takes a queen, it’s not selfmate (there are other choices to paralyse wK without unparalysing bK). Even if the bQ were to play to unparalyse the bK it still would not be mate due to the extra rule concerning mate, but that rule is not necessary for the soundness of this problem.

seetharaman
seetharaman
4 years ago

Not correct Stephen. If black were to unparalyse his king with a queen also (e.g. in the first solution by 2.pQe3) it would be mate because white’s paralysing rook or bishop has the free moves. So black has to underpromote so that he will have the only move (which will unparalyse his king) to paralyse the white king.

seetharaman
seetharaman
4 years ago
Reply to  seetharaman

I am sorry, you are right because the white paralysing rook or bishop will also be paralysed and white will not have the free move!

Luce Sebastien
Luce Sebastien
4 years ago

Dear Gani,

it is also C+ Winchloe !
Please Julia, indicate that it is also C+Winchloe
for the problems !

Gani ! I love to be surprised ! I didn’t know the paralysing pieces. If I understood well, each time to parry the check,
black has to cover with a paralysing piece, but in both cases, it is black King which mates ! Well done, in a very economical maner. I like it !
Sebastien

seetharaman
seetharaman
4 years ago
Reply to  Luce Sebastien

The check by white is by the King to the paralysed black king. Black is forced to reply by by paralysing the white King. Because this move of black unparalyses his king, the paralysed white king is mated ! Well done Ganapathi! Dont know if more can be done with four pieces!!

Ganapathi
Ganapathi
4 years ago
Reply to  seetharaman

Dear Stephen,Sebastien,Seetha,
I humbly thank you all for such nice comments!