Problem 424.1: Zivko Janevski & Rodolfo Riva  Helpmate 
(15.07.2014) An interesting Helpmate Meredith in Setplay 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 coauthor Rodolfo Riva.

KOBULCHESS.COM
site for chess composition
General editor:
Diyan Kostadinov
Coeditor:
Seetharaman Kalyan
Comments
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
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. Onetwo 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.
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After 2...Rc3+ White can see that his tactics must be changed, 1...Bb7 will guard d5 and wR must be (virtually) "withdrawn" from e5 back to e4.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 Re4Kc4.
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).
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.
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.
RSS feed for comments to this post