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Problem 253 (version 253.1): Vitaly Medintsev - Helpmate

vitaly(03.10.2013) Really wonderful problem by the russian helpmate master - warm welcome to Vitaly Medintsev!

P.S. After publication of the problem 253 had been found that it can be optimized. Here is the improved version 253.1.



 

253.1

1.Sxc3 Rb7(exd6?) 2.Sd5 e6#

1.dxe5 Rc7(Rb7?) 2.e4 Rf2#

1.Rxb2 exd6(Rc7?) 2.Rbb7 Rf3#


Cyclic Zilahi with complete cyclic function permutation

of thematic white pieces (annihilation/guarding e7/mating),

dual avoidance on W1 and black interference on B2. (Author)

 

Comments  

 
+2 #1 seetharaman 2013-10-04 14:02
The master shows what can still be done in two moves ! Excellent problem with rich dual avoidance and cyclic play.
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+3 #2 Nikola Predrag 2013-10-05 00:13
Hm, 1.dxe5-2.e4 looks as a clear dual avoidance.
1.Sxc3-2.Sd5 would be a different dual avoidance without bQa8. But bQ is there as a cookstopper.
1.Rxb2 Rc7? 2.Rb3+ avoids e6#??, this is a kind of dual avoidance but still wKh3 looks more as a cookstopper.

In any correct multiphase helpmate, each solution is unique. The avoidance of dualistic moves is an ordinary matter of a correct construction.
Dual avoidance should show both the useful and harmful NEW effects of one and the same motivation for the play.

But with or without dual avoidance, the complex mechanism works incredibly good in beautiful cycles. I agree:
"The master shows what can still be done in two moves!"

BTW, a switch Bd8Rf8 would spare Ph7.
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+2 #3 Vitaly Medintsev 2013-10-05 20:22
Thanks for the informative comment, Nikola!
"Dual avoidance should show both the useful and harmful NEW effects of one and the same motivation for the play" - can you point to any reference literature confirming your approval?
The construction will be optimized,
certainly.
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+3 #4 Nikola Predrag 2013-10-07 00:32
Now I have only the "Velimirovic-Valtonen Encyclopedia" at hand. As it is often with definitions, some good examples are required to illustrate what is essential for a particular theme. Dual avoidance may be differently interpreted by different people. It's OK as long as some interpretation is consistant and clearly distinctive. A convincing genuine thematic dual avoidance comes out of the play. If some possibilities are prevented already in the initial position, prior to the play, this is simply a matter of soundness. It is present in every problem and belongs essentially to the avoidance of cooks. The author may artificially choose some of such, let's call them "cook avoidances" and proclaim them as dual avoidances. These might be arranged in a nice pattern and thus given some artistic and thematic value. But there is the essentiall difference between the "cook(dual) avoidance" prior to the play and the dual avoidance caused by the play.
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+1 #5 Nikola Predrag 2013-10-07 00:32
If I can see the difference, anyone can see it and the literature should consider and explain it.
In the mentioned Encyclopedia, there is a beautiful No.500 showing true triple avoidances. There is also a very nice No.499 showing an artificial cycle of dual avoidances by mixing 2 true dual avoidances and 2 artificially chosen "cook avoidances". If we neglect the mentioned essential difference, there would be the quadruple avoidances but the links for the cyclic shift would disappear.
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+2 #6 Vitaly Medintsev 2013-10-08 21:25
Thank you very much, Nikola! I have not the "Velimirovic-Valtonen Encyclopedia".
I suppose you are right!
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+1 #7 Nikola Predrag 2013-10-10 01:00
Well Vitaly, I may hope I'm right but I wrote only my own understanding and interpretation of various descriptions which I had heard or read through the years. It might be expected that there is literature which systematically and precisely explains the elements of chess composition but where could it be found? Unfortunately, the easy achievable internet sources usually offer only short descriptions. And these could be interpreted vaguely or even contradictory.
Some reliable source which would clearly explain numerous distinctive elements would be precious. Discussions on the forums are a good ground for many clarifications but they rarely end with a systematically defined conclusions. Well formulated questions should initiate well formulated answers and a lot of theoretical material might get ready for collecting. However, when I try to ask some elementary question there's often no answer at all.
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+1 #8 Nikola Predrag 2013-10-10 01:00
I found a post on the internet with all examples showing dual avoidance as a result of the play. That could be an accidental choice of problems, but it goes well with my understanding of the matter:
chessproblems.com/.../...
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+1 #9 Vitaly Medintsev 2013-10-11 13:27
Very interesting, thank you!
Could there be any specific in the matter of dual avoidance in helpmate genre?
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+1 #10 Nikola Predrag 2013-10-12 10:27
The article I mentioned commenting your 258 is about "Dynamic Square obstructions as a tool for dual avoidance in helpmates in 2 moves"
www.variantim.org/.../
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