Problem 424.1: Zivko Janevski & Rodolfo Riva

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Problem 424.1: Zivko Janevski & Rodolfo Riva - Helpmate

riva (15.07.2014) An interesting Helpmate Meredith in Set-play form, pin mates and change of functions by Zivko Janevski.

P.S. The problem is updated and here you can see the improved version 424.1 with co-author Rodolfo Riva.

424.01

Comments

+4 #1 Nikola Predrag 2014-07-15 12:27

Beautiful dynamics of the logic with perfectly clear reciprocal changes of strategy and tactics.

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+4 #2 Rodolfo Riva 2014-07-15 18:48

More economical version:+
8/8/B7/1pp5/2kp1R2/R7/2sPK3/8 (5+5)
h#2* b)Sa1-->c2 perpetuum mobile
Anyway the bS maneuver is not new:
R. Riva, Problemas 1982
s7/8/8/2kBK3/8/8/PS6/8 (4+2) h#2*
b)Sa8-->c7 Idealmates

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+1 #3 Seetharaman Kalyan 2014-07-16 05:47

Great economy Rodolfo! Using the white King for guarding is crucial. Well done. As you rightly say, the knight selfblocks are well known and I think much older examples should be there. But combining with pinmates I hope is not anticipated.

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+1 #4 Nikola Predrag 2014-07-16 16:24

Excellent version, Rodolfo!
But the complexity of Zivko's idea is perhaps not obvious to everyone.

In your old problem, in setplay (h#1.5), bS will block b6 so wP/wS must guard b5/b4. After 1.Sc7 in solution there's h#1.5 where bS will block b5 so wP/wS must guard b4/b6.
Trivial blocks and guards make all strategy. One-two steps by wP is a nice visual pattern and the lack of black tempo in solution requires a change of play, showing the dynamics of logic.

But that all is well known, there are 3 flights and the interdependence of 1 selfblock and 2 flightguards is present by default.

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+1 #5 Nikola Predrag 2014-07-16 16:25

In your excellent version of No.424, bS will block b4 and wR will check on c3 so d5 must be guarded.
Apparently, this is a trivial strategy which simply reflects the tactics. But the White's choice of tactical possibility 1...Re5 results with black tactical possibility 3.dxc3!.
After 2...Rc3+ White can see that his tactics must be changed, 1...Bb7 will guard d5 and wR must be (virtually) "withdrawn" from e5 back to e4. Now black tactical 3.dxc3? is prevented by opening the white tactical attack Re4-Kc4.
The change in the play between the try 1...Re5 and solution 1...Bb7 shows the changed strategy (choosing the tactical guard of d5 and including a pin of bPd4).

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+1 #6 Nikola Predrag 2014-07-16 16:26

The main strategic idea is avoiding the relevant unpin, the pin of bPb5is irrelevant in the setplay and White can afford that unpin. This unpin of Pb5 alone, would not be a thematic strategic element exactly due to its irrelevance, but it becomes relevant in the solution where the unpin of Pd4 becomes irrelevant. So the main strategic idea is a determination of which pin is relevant and which is not. This is presented perfectly clearly with full reciprocity.
That dynamics of logic is enriched by the "temporal" dynamics (change caused by a lack of tempo).
Such temporal dynamics is well known in the simple directly interdependent relations of changed selfblock/flightguard. Here, the relation is selfblock/unpin, which are by no means directly interdependent.
HOW TO CREATE THAT INTERDEPENDENCE, it's a complex task for the composer's imagination.

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0 #7 Diyan Kostadinov 2014-08-20 01:25

The problem is now updated with the improved version 424.1 with the co-author Rodolfo Riva.

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+2 #8 Miodrag Mladenovic 2014-08-20 06:52

Great problem. I do like it a lot. However I have to notice that Mr. Riva has double standards. He rejected my selfmates from SuperProblem thematic tournaments because of repetition of moves. However in this problem all moves from a) and b) are repeated. If he stands up to his standards he would not publish this problem.

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0 #9 Seetharaman Kalyan 2014-08-20 10:49

Quoting Miodrag Mladenovic:

However in this problem all moves from a) and b) are repeated. If he stands up to his standards he would not publish this problem.

Well... set play of (a) and (b) is repeated as solution in the other phase with the introductory black move. Left to myself, I would not have indicated setplay in such a problem. But the composers perhaps wanted to show it as a sort of paradox.

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