No.1578
Sven Trommler
(Germany)


(v) 1578.1 Daniel Papack & Sven Trommler (Germany)

Original Fairy problems
JF-2021-I:
01.01.2021 - 30.06.2021


Definitions / Определения


No. 1578 Sven Trommler
Germany
original - 08.01.2021
Dedicated to Franz Pachl 70th birthday

white Pa4 Rb5 Kg8 Se8c8 Ba8 black Pb4c4f4g5c5d7 Bd3 Sg3 Rd5d8 Ka6
#3                       6+11
Anti-Circe

Solution: (click to show/hide)


No. 1578.1 Daniel Papack &
Sven Trommler

Germany
version of No.1578 - 24.01.2021
Dedicated to Franz Pachl 70th birthday

black Pc5a5e4f7d7d6b6 Sa4 Bc3e8 Rh1e2 Kf6 Qa7 white Ph2g4f4h6e6 Re5 Kf8 Se7b7
#3                       9+14
Anti-Circe

Solution: (click to show/hide)


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Juraj Lörinc
Juraj Lörinc
January 8, 2021 15:17

Reminds me of HPR’s #3 Anticirce with 3 bQs

shankar ram
shankar ram
January 9, 2021 16:47
Reply to  Juraj Lörinc

Indeed! It shows an incomplete Rotating Jacobs.
Missing is a defence by the BS which:
– unguards f1
– retains guard of h1
– guards b1
This would complete the cycle with CAB.

Last edited 9 months ago by shankar ram
Manfred Rittirsch
Manfred Rittirsch
January 8, 2021 22:10

This problem is sound only in Anticirce Calvet. In Anticirce Cheylan 1.Kh8! also works. One should not omit the type if it makes a difference, because there is no generally accepted default.

shankar ram
shankar ram
January 25, 2021 11:24

This new version is wonderful! With rebirth prevention/allowance of WK, WR and WP – instead of that of WR, WB, WS in the earlier version. It also completes the Jacobs cycle (the move pattern should now be indicated as A-BC, B-CA, C-AB!). As a final cherry on top for Franz’s birthday cake, there are now two anticirce specific tries!

Torsten Linß
Torsten Linß
February 1, 2021 18:03
Reply to  Julia

I wouldn’t call this a “cycle”. Because all 6 black second moves are different, there is nothing that forces the order ABC-BCA-CAB instead of say ABC-BAC-CAB. It’s “just” the Jacobs theme — and a damn good problem.

Last edited 8 months ago by Torsten Linß
shankar ram
shankar ram
February 1, 2021 19:17
Reply to  Torsten Linß

It’s an “unordered cycle”. Such cycles exist in other themes too. For example, a 4 phase cycle of double threats, AB/BC/CD/DA. The pattern is shown in an “ordered” way, just for convenience. Though, some problems do exist which bring about this ordering by adding other elements. The word “cycle” has been attached to the Jacobs theme over a period of time, as in “Jacobs cycle”. The pattern is based on the moves by White. In some simple examples, the Black second moves also form a cycle. But in more complex renderings, like this one, the Black moves are different, and there is no cycle involving them.