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Problem 851: Petko Petkov - Helpmate
petko.petkov(01.10.2017) Very nice helpmate by Petko Petkov with rich thematic content probably shown for the first time according to the author.
 
 
 
 
 
 
 
 
 
851
 
I  1…Bc2! 2.Sf6! Rc7!! 3.Kc1 Sa2#
II 1…Bb3! 2.Rf6! Re3!! 3.Ka3 Sb1#
 
Thematic complex
 
1.Bivalve-theme after 2.Sf6! (I) and 2.Rf6! (II) combined with unpins of the white Rook.
2.White Ambush-moves after 2...Rc7!!(I) 2...Re3!! (II).
3.Creation of two white indirect batteries S/R and S/B in each solution after the preliminary white moves of w.Ba4 that closed simultaneously two lines (!) - by the w.Rook and by the b.RQ and bR after the key-moves.
4.Model-mates.
In my opinion this complex is demonstrated for the first time.
(Author)
 

Comments  

 
+4 #1 Seetharaman Kalyan 2017-10-01 07:57
A traditional helpmate from Petkov again is an important event! He packs so much in 2.5 moves !
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+5 #2 Rodolfo Riva 2017-10-02 20:26
bQb4 is useless to the
scheme: 4B3/4r1k1/5S2/Ks1pB1r1/1Rp5/8/8/4b3 (5+7)
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+6 #3 Rodolfo Riva 2017-10-02 20:52
Following scheme saves a black unit:
8/4r1k1/5S2/Ks2B1rB/1Rp5/8/8/4b3 (5+6)
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+4 #4 Jozef Lo?ek 2017-10-05 12:35
version after P.Petkov

White Sf6 Ka5 Be5 Bh5 Rb4
Black Re7 Kg7 Sb5 Rg5 Pc4 Pe2

H#2.5 ( 5 + 6 ) 2 sols.

1...Ba4-c2 2.d7-d6 Re7-c7 3.Kb2-c1 Sc3-a2 #
1...Ba4-b3 2.Re6-d6 Re7-e3 3.Kb2-a3 Sc3-b1 #
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+5 #5 Petko Petkov 2017-10-06 07:28
About #3 Rodolfo Riva 2017-10-02 20:52
Following scheme saves a black unit:
8/4r1k1/5S2/Ks2B1rB/1Rp5/8/8/4b3 (5+6)

I have tried many similar positions. I do not think that your version 8/4r1k1/5S2/Ks2B1rB/1Rp5/8/8/4b3 (5+6) is better because of the full symmetry in the matte finals and the weak mobility of the black pawn which has only one possible move.By the by, I try other versions but not in such direction.
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+4 #6 Viktoras paliulionis 2017-10-06 08:59
I agree with Petko Petkov. The mobility of pieces is no less important aesthetics criterion of chess problem than economy of black pieces.
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+3 #7 Rodolfo Riva 2017-10-06 12:34
To #5

Also in Problem 851 there is full symmetry in the mates, so I agree that betters results could come from other directions.
At the moment I don't know if it is possible to exploit the mechanism and avoid symmetry.
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+4 #8 Rodolfo Riva 2017-10-06 13:16
To #6

I don't see how nice it is to count the moves bRe6 does not do. Actually the bRook lost its essence: at one stage plays like a pawn, in the other is a perfect dummy (like a horror film without monstrosity).
In helpmates and HelpSelf a more relevant criterion than mobility or economy is the lack of cookstoppers and/or misused pieces (as in scheme at #3).
Of course, the mobility of pieces could be a useful criterion when comparing full lenght or shorter Bristols or when the pieces exploit their potential as much as possible.
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+2 #9 Seetharaman Kalyan 2017-10-06 13:28
Quoting Rodolfo Riva:
To #5

Also in Problem 851 there is full symmetry in the mates, so I agree that betters results could come from other directions.
At the moment I don't know if it is possible to exploit the mechanism and avoid symmetry.


With black Q or Rb4 symmetry around bK seems inherent in this scheme. Mobility of thematic pieces however is a different question.

Thanks Rodolfo Riva & Victoras for this very valuable discussion about economy. Wonder what other experts also think on this important criterion.
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+4 #10 Petko Petkov 2017-10-06 15:09
To #8 Rodolfo Riva
Of course, in this scheme symmetry is inevitable - both in the original and in its variations. That is why I said that I am currently trying to develop this scheme in a very different direction. About economy: in my opinion, Rodolfo's pawn is worse, because w.R here is very limited, and the Pawns move here is not only unique but obvious. But of course, in my position the wR is also not active enough. In such cases (if it is possible) it is necessary to make very substantial changes in the scheme and the idea. So, expect my new version!
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+2 #11 Diyan Kostadinov 2017-10-06 21:26
Jozef (comment #4), please check your version and solution, it looks like some mistake is there!?
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+1 #12 Jozef Lo?ek 2017-10-07 13:56
A version after P.Petkov :

White Kf8 Re7 Ba4 Bd4 Sc3
Black Pd7 Re6 Qb4 Kb2 Rd2 Pe2

H#2.5 ( 5 + 6 ) 2 sols.

1...Ba4-c2 2.d7-d6 Re7-c7 3.Kb2-c1 Sc3-a2 #

1...Ba4-b3 2.Re6-d6 Re7-e3 3.Kb2-a3 Sc3-b1 #

Here I saved two black figures and the content is same .
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+1 #13 Petko Petkov 2017-10-08 12:04
To #12 Lo?ek, Riva...and others...

I have already announced that I will publish a new version of my task, which will be significantly different from the original. So, there is no sense of foreign help and "cosmetic corrections" on my original.
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