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Problem 522: Dragan Stojnic & Branislav Djurasevic - Helpmate
dragan.stojnicbranislav.djurasevic(04.02.2015) A H#6 with fourfold creation and play of black batteries with double checks - probably a task! Welcome to Dragan Stojnic and Branislav Djurasevic from Serbia!
1.Sed2 Kg5 2.Sf3+ Kf5 3.Sd4+ Ke5 4.Sc6+ Kxd5 5.Sb4+ Kxc5 6.Ra6 axb4#
One black piece (in this case a knight), during the play, creates four active batteries as a front piece. All checks from the new forming batteries are double checks - four times consecutively! Additionally, rear pieces in all forming batteries are different!
Previous example with four double checks is by Chister Jonsson and Anders Lundstrom, Springaren 1991, h#5, white: Kc8,pg2 (2), Black: Kh4, Qa7, Rb6, Rc5, Bc3, Bc6, pb5, e6, f5, h5. (10); solution: 1.Bc6-b7+ Kc8-d7 2.Bb7-c6+ Kd7xe6 3.Bc6-d5+ Ke6xf5 4.Bd5-e6+ Kf5-f4 5.Be6-h3 g2-g3#. Here, only three different rear pieces exist in these battery systems (Rc6 plays two times as rear piece).


+1 #1 Vitaly Medintsev 2015-02-04 08:01
Fourfold creation and play of black batteries with four different rear pieces and double checks is definitly a task!

Compare to the following h#6:
+1 #2 Vitaly Medintsev 2015-02-04 08:10
Here is the problem mentioned by the authors of 522:
0 #3 eugene david rosner 2015-02-05 04:49
How does Vitaly find this stuff so quickly?! :-)
He is quite the resource!
+1 #4 Vitaly Medintsev 2015-02-05 08:30
:-) Eugene,
Long time ago I was trying to implement the similar idea but my work (see below) had gotten no distinction since been anticipated by Abdurahmanovic&Rehm masterpiece
0 #5 Seetharaman Kalyan 2015-02-05 10:32
Well... Abruahmanovic&Rehm problem is indeed a masterpiece with the added bristol effect. But I dont think it anticipates your nice problem. They are surely different schemes.
+3 #6 Branislav 2015-02-09 15:32
GM Fadil Abdurahmanovic confirms in his personal communication with one of author that this complex (fourfold creation of black batteries together with fourfold double checks)is new. Thank you Fadil for support.

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