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Has the following construction task been shown before?

Can it be beaten?

M.McDowell

Original (?)

(= 8+5 )

1.gxf8Q will mate a black king standing on any one of 31 squares.

This is a Kriegspiel 1#. Very nice.

Yes, this is known, but I don't recall *where*, *when*,
and from *who* I saw it, or if the position is identical.
But at least you now know you're anticipated :P

Hauke

Close, but with 2 mating moves:
Karl Fabel
Fairy chess review 1939
(= 7+6 )

#1 for how many squares of the black king?

QUOTE

This is a Kriegspiel 1#. Very nice.

Is gxf8 legal in Kriegspiel? White can't know that there is a piece on f8, can he?

Of course he can know, e.g. if something unknown has just captured something known there. It is even possible to know it is knight, as White has already captured all remaining black force, he could have discovered the type of remaining piece by trying to move his king in the knight's vicinity.

In a Kriegspiel game he might now, but not in a Kriegspiel problem.

Actually, in a Kriegspiel problem it is much easier. Author just sets the board and gives stipulation. He is free to set up black pieces on the board. There are many Kriegspiel problems featuring pieces of both sides.

http://jurajlorinc.tripod.com/chess/krieg1.htm
http://jurajlorinc.tripod.com/chess/krieg2.htm

Here, you can bring it to 32 :

(= 9+7 )

To my taste, the Fabel is much less interesting : it is not a Kriegspiel.

Why not a bishop on h8?

You lose g6 as a mating square.

slightly lighter :

(= 8+6 )

Refutation:
bKa6; 1...b6-b5!

(13) Posted by Zalmen Kornin [Thursday, Sep 10, 2009 17:24]; edited by Zalmen Kornin [09-09-10]

this is starting to become like the 'Belén Story' :)

@Siegfried : The bK cannot be on a6 !

@Zalmen : what is "Belen story" ?

Jacques: The most animated online problem 'workshop' so far - some of the original posts appeared in the disappeared "Rebnora" forum. But most is still online in other places , for instance http://www.chessproblem.net/viewtopic.php?f=7&t=60

On the topic: Bravo, it seemed very hard to improve Michael's position

In fairy chess, this can be improved of course. So far, the maximum I've been able to find is 57:
(= 2+2 )

=UbiUbi
1. gh8=UU and the king is mated on all 57 squares it could've legally been before white's last move (last move was in all cases f7xg6, unless the black king is on f7, then it was Kxf7).

And if the white king doesn't have to be present, this can be improved to 59:
(= 2+1 )

=UbiUbi
1. gh8=UU and the king is mated on all 59 squares it could've legally been before white's last move.

If you go to fairy field with no limitation, it seems that you can do (much) better.

The UbiUbi problem works on an infinite board, no?
Can't do much better than this, and marvelous economy.

I'm not certain this improves, but if you stipulate that black's Royal unit is a King...

white Royal-Pawn g7
black UbiUbi h8

(= 1+1 )

#1 Kriegspiel

Then extend the board infinitely (South and West).
Of course, the position is almost certainly retro-illegal.

And if black's king stands on h7 or g8, white is already checkmated. However, this would certainly be retro-illegal.

a single non-capturing immune and transparent pawn on h7, with promotion in powerful ubi-ubi allowed.
Then 1.h8=Ubi-ubi gives mate with the black K being possibly on 64 cases !

Then, of course, you can extend the chess board .... as suggested ....