Julia's Fairies

No.377,377.1 (IK)

No.377, 377.1
Igor Kochulov (Russia)


Original Problems, Julia’s Fairies – 2013 (III): September- December

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No.377 by Igor Kochulov – Interesting Duplex-HS#3 with Zilahi theme!  (JV)

No.377.1 by Igor Kochulov – An improved version to No.377.  (JV)


Grasshopper(G): Moves along Q-lines over another unit of either color to the square immediately beyond that unit. A capture may be made on arrival, but the hurdle is not affected.

Rookhopper: As Grasshopper, but moves on Rook lines only.

Bishophopper: As Grasshopper, but moves on Bishop lines only.

PAO(PA): Moves as Rook, but captures only by hopping over a hurdle to any square beyond.

VAO(VA): Moves as Bishop, but captures only by hopping over a hurdle to any square beyond.

No.377 Igor Kochulov
hs#3                 Duplex              (9+11)
Grasshoppers: c1, h3
PAO d3
VAO f4
Solutions: (click to show/hide)
No.377.1 Igor Kochulov
Version to No.377, 22.10.2013
hs#3                 Duplex              (10+9)
Rookhopper h3
Bishophopper c1
PAO d3; VAO f4
Solutions: (click to show/hide)

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September 18, 2013 08:55

Unpinning the unpinner ! Nice!

Geoff Foster
Geoff Foster
September 20, 2013 02:38

The solutions are in error, because they don’t indicate that 2.VAf4+, 3.VAd6+, 2.PAd3+ and 3.PAd6+ are checks.

The final check in each part becomes the mate in the other part! I especially like the roles of the knights. In one part they parry a check, open a line for the final check and become a hurdle, while in the other part they are pinned in the mate. A complex and wonderfully rich work!

Nikola Predrag
Nikola Predrag
September 20, 2013 15:58

The play and content are very nice but the most fascinating is the orthogonal-diagonal change between the phases achieved with the same pieces which all have a thematic role in both phases.
Without a proper Duplex-example for a comparison, I can’t tell whether this is “only” a beautiful geometry or a complex strategical masterpiece.

But again, there is a dubious interpretation of a short definition/description of a theme. The essence of some theme is not in the outer appearance but in the motivations and goals.
The goal of Zilahi is not a sacrifice+some abstract mate, reciprocally by 2 pieces. The goal is to mate the same King, that is what tightly connects the two pieces-the same goal.

The essence and the outer appearances or impressions should be differentiated. The themes Zilahi and Umnov are different than Zilahi-effect and Umnov-effect which only imitate the apperance of the themes.

shankar ram
shankar ram
March 16, 2014 12:20
Reply to  Nikola Predrag

missed seeing this problem..
>> Without a proper Duplex-example for a comparison..
see this: http://www.theproblemist.org/sample-problems/35-favourite-problems/52-chosen-by-colin-sydenham
it’s an ortho duplex h#2.. similar geometry..

shankar ram
shankar ram
March 16, 2014 13:25
Reply to  shankar ram

Of course, this problem is more complex than my old H#2..
Winchloe lists following effects/themes:
Zilahi, Batterie noire, Switchback blanc, Batterie blanche, Switchback noir, Déclouages réciproques, Switchback de pièce féerique, Quasi-sacrifice blanc, Mouvement Pelle, Sacrifice noir, Echecs croisés, Captures réciproques, Echo diagonal-orthogonal, Mat par clouage, Anderssen, Auto-clouage direct, Anderssen noir, Clouage direct, Batterie masquée, Déclouage indirect..
But is 377.1 really an improvement..?
I much prefer 377: positions of B/W Ss are more analogous.. and Gs, instead of R/B hoppers..!
Very nice duplex matched sequence: A unpins B, B unpins A, switchback by A, self pin by C, line opening by A, Battery mate by B capturing A and pinning D..
In the duplex line, exchange A/B, C/D..

Nikola Predrag
Nikola Predrag
March 16, 2014 14:02
Reply to  shankar ram

Yes, beautiful geometry used in a true duplex for showing ODT in the reciprocal strategical “unpin by the unpinned piece” (1st unpins are interferences on the same square).

Fairy pieces and the additional 2 halfmoves in No.377 are skilfully used to enrich the complexity of content, by pinning new pieces (bS/wS) on d3/f4 which will serve as hurdles for “Chinese-captures”. Both Knights have to be pinned also on their initial squares in pin-mates.

Benefit of hs# is a potential for perfect econommy. Both w/b Pawn-cages are needed in both phases of duplex.

P.S. Before posting this comment, I see that a new comment was posted but I have no time now to adjust my own

Geoff Foster
Geoff Foster
September 22, 2013 00:37

I’m glad that Nikola made his comment. To me the problem seems really excellent, so it’s good that somebody else thinks so. I agree that it is not a Zilahi, but that is not important.

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