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MatPlus.Net Forum General Multiple Dombrovskis
 
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(1) Posted by Marjan Kovačević [Wednesday, Oct 3, 2012 21:27]

Multiple Dombrovskis


The discussion started in the thread “The Encyclopedia of Chess Problems” used several examples.
Alfred Dombrovskis himself, as well as Soviet theory, would hardly agree. They say mates are to be provided by the key-move (not to exist in the set-play). This important element of the theme was somehow lost in translation – from Russian to letters A, B, C…
It means only Zhuravlev’s example presents the theme in more than 2 variations. However, the absence of the threat (block with many black duals) makes this example inferior, if thematic at all.
 
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(2) Posted by Jacques Rotenberg [Thursday, Oct 4, 2012 00:17]; edited by Jacques Rotenberg [12-10-04]

It seems nowadays that the definition of 'Dombrovskis theme' is the formal definition :
1.X[A#] a!
1.Y[B#] b!

and then : 1.Z followed with 1...a 2.A#, 1...b 2.B#

It seems clear that it is not the complete intention of Dombroskis himself who added - as far as I know - conditions about the key of the solution that would bring the changes and a threat.

The Dombrovskis theme have escaped the strict will of Dombroskis himself.

the 4-fold shown are of course weak forms of Dombrovskis, but it seems too much to discard them.
 
 
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(3) Posted by Marjan Kovačević [Thursday, Oct 4, 2012 20:58]

No intention to discard these five examples (I rewarded one of them), but to separate them from multiple presentations of the theme in it's original form.
 
   
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(4) Posted by Zalmen Kornin [Friday, Oct 5, 2012 12:45]

Perhaps should we call that program "Ideal-D." !? - and the bare formula "The D." (A strict aplication of Dombrovskis will would reduce drastically the number of acceptable D.s! - for instance: most of the lightweights are (sic) Zzw ; or: even in some quite accomplished "Ideal", Try defence finds an empty square, and Real play variation, a white unit that (not incidentally) was the one that played the Try move.) - Or: "Half-Ideal" examples, etc
 
   
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(5) Posted by Joose Norri [Saturday, Oct 6, 2012 06:26]

And the same question about other related themes. In which of them is it considered obligatory that the changes are provided by the key? Is it a matter of common agreement or the originators' will? Or can it be logically substantiated?
 
 
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MatPlus.Net Forum General Multiple Dombrovskis