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MatPlus.Net Forum General In a change of stipulation Lacny, how essential is it to have different keys between the two phases?
 
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(1) Posted by Eugene Rosner [Thursday, Nov 5, 2015 23:42]

In a change of stipulation Lacny, how essential is it to have different keys between the two phases?


Just curious! I know Juraj Lorinc has an interesting take on this question, but how about some other opinions?!
 
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(2) Posted by Miodrag Mladenović [Friday, Nov 6, 2015 08:07]

Eugene, can you give some more information? Did you mean that you have twins with a same key and different variations that are showing Lacny theme? Like this:

a) 1.X!
1...a 2.A ...
1...b 2.B ...
1...c 2.C ...
b) 1.X!
1...a 2.B ...
1...b 2.C ...
1...c 2.A ...

If this is tru my opinion is:

The different keys between phases are always better. So if you send your problem with a same key in both phases and there is other problem showing same theme with similar complexity of mechanism then other problem will be ranked better. However if you have same key but some very complex and original mechanism not shown before it may push your problem up in the award. Once again without seeing problem it's hard to comment this. Also, generally I do not like twins when showing Lacny theme. It's much easier to achieve this theme using twins.
 
 
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(3) Posted by Eugene Rosner [Friday, Nov 6, 2015 14:18]

Miodrag-
You hit the nail on the head-exactly the pattern you show. Indeed, I prefer the different keys as well, but Juraj pointed out in a separate communique, when the problem shows a depth of play, the different keys "may" be a distraction, and the same key will allow you to focus more on the mechanism. I'll hope to share a few of mine soon as they are getting ready for publication.
 
   
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(4) Posted by Joose Norri [Saturday, Nov 7, 2015 02:24]

As examples, G95 in the new album and G101 in the 1986-88 album have the same key, while G155 in the 07-09 a different one. I think Seider composed quite a few of both types.
 
   
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(5) Posted by Miodrag Mladenović [Saturday, Nov 7, 2015 07:36]; edited by Miodrag Mladenović [15-11-07]

Here is a nice 4-fold example:

Michel CAILLAUD
1. Pr. MAT 1982
(= 8+8 )

#2
a) Ortodox
b) Circe

a)
1.Sf6! zz
1...Re~(a) 2.Sxe5#(A)
1...Sg~(b) 2.Qxe4#(B)
1...Rh4(c) 2.Sxg5#(C)
1...Se~(d) 2.Qxg4#(D)

b)
1.Sf6! zz
1...Re~(a) 2.Qe4#(B)
1...Sg~(b) 2.Sg5#(C)
1...Rh4(c) 2.Qg4#(D)
1...Se~(d) 2.Se5#(A)
(1...e2 2.Rf2#)
 
   
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(6) Posted by shankar ram [Sunday, Nov 8, 2015 04:10]

Of course, different keys are always better!
But, sometimes, it becomes difficult to fit just one key, let alone two!
So, this is basically a constructional challenge.
Saying that having same keys avoids distraction and helps to focus on the mechanism may have some merit, but it depends on the problem... or it sounds a bit like making a virtue out of a necessity! You could as well have the twins with stipulation "black to play" (i.e W already having made the key)! ;-)
 
 
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MatPlus.Net Forum General In a change of stipulation Lacny, how essential is it to have different keys between the two phases?