Problem 253 (version 253.1): Vitaly Medintsev - Helpmate |
P.S. After publication of the problem 253 had been found that it can be optimized. Here is the improved version 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) |
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Comments
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.
"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.
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.
I suppose you are right!
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.
chessproblems.com/.../...
Could there be any specific in the matter of dual avoidance in helpmate genre?
www.variantim.org/.../
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