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MatPlus.Net Forum General Urania+threat reversal=?
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(1) Posted by Hauke Reddmann [Friday, Apr 13, 2012 16:41]

Urania+threat reversal=?

1.A? (2.B) (1...X!)
1.B? (2.A) (1...Y!)
1.C! V,W 2.A,B

As you see, we got Urania doubled (A and B appear as
try, threat and mate move) with in-built threat reversal.
Since I don't know anything about letter themes (and
reverse searching Udos 2# lexicon is too inefficient)
maybe you know: Does this have it's own name?

If not, maybe you could cite the most economic rendering.
It's not hard to compose, I just did it with 10 men.
In fact, sordidly few days too late, since it's an
(somewhat rectangular) easter-egg. :-)

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(2) Posted by Juraj Lörinc [Friday, Apr 13, 2012 20:40]

I do not know if this combination of themes has its own name. By a quick WinChloe search I have found the following miniature example, even with one Dombrovskis paradox

Vitalij Kovalenko
Zadachi i Etyudy 1998
(= 4+3 )
#2 (4+3)

1.B×d6? [2.b5‡]

1.b5? [2.B×d6‡]

1.Kb6! zz
1…d5 2.b5‡
1…K×b4 2.B×d6‡
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(3) Posted by Hauke Reddmann [Saturday, Apr 14, 2012 15:37]

Bingo! I stand with egg in my face :-)
I *knew* that a miniatur version was possible
(and just didn't think enough outside the box).

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(4) Posted by Frank Richter [Saturday, Apr 14, 2012 16:55]

It isn't exactly the pattern, here we see:
1.B? (2.A) (1...Y!)
1.C! V,Y 2.A,B and not 1.- V,W
(if this makes a difference, of course ...)
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(5) Posted by Juraj Lörinc [Saturday, Apr 14, 2012 19:58]

Strictly speaking, it is really different pattern.
But as I have remarked, this Kovalenko version shows even one proper Dombrovskis paradox, reusing one of the refutations as defence. This is usually considered more difficult than using the completely new defence.
However in the context of the most economical position this is actually a kind of help to cut number of pieces as much as possible.
Also for some specific themes the form with different black defences can be more difficult than with the same.
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(6) Posted by Hauke Reddmann [Sunday, Apr 15, 2012 14:28]

For my purposes, it's not very relevant if
W=Y (adding even a whiff of paradox)...
especially given that mine has V=W=stalemate.
Yes, I'm a cheat :-)
(I show the position next Easter.)

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MatPlus.Net Forum General Urania+threat reversal=?