No.885 (GW)

No.885 
Günther Weeth (Germany)

Warm welcome to Günther in Original Problems section of JF!

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No.885 by Günther Weeth – A demonstration of Hoeg Retractor – one of the different kinds of Defensive retractor. (JV)

No.885.1 by Günther Weeth – An improvement made by author after discovering the following dual in No.885: 2…., e4:Qf3[f7]+! 3.Qg3-f3, Rf3-f8+ 4.Kf1-e2, Ka8-a7+ 5.Kf2-f1, Re3-f3+ 6.Qg1-g3, Rg3-e3+ 7.Ke1-f2, d3-d2+ 8.Kb6:Ba6[Ke1] – fw.1.Ka7#  (JV)


Definitions:

The -8 & #1 stipulation means: retract 8 moves and then the White (forward) mating move.

Defensive Retractor: In Defensive Retractors, White and Black retract (take back) a given number of moves (-n moves), in order to reach a position in which a forward stipulation (e.g. #1, s#1) is met. Given a choice, Black will retract those moves that avoid or delay White’s goal. Unless otherwise stated, Black may defend by mating White through a forward move, if such an opportunity exists after one of Black’s retractions.
The different kinds of Defensive Retractors only differ in the way uncaptures are handled, of course only legal uncaptures are allowed:

  • In Proca Retractors the retracting side decides, if and what man was uncaptured.
  • In Hoeg Retractors the opposite side decides, if and what man was uncaptured.
  • In Klan Retractors always White decides, if and what man was uncaptured.
  • In Pacific Retractors there are no uncaptures at all.

Anti-Circe: After a capture the capturing piece (Ks included) must immediately be removed to its game array square (necessarily vacant, else the capture is illegal). R, B & S go to the square of the same colour as the capture; Ps stay on the file of capture; fairy pieces go to the promotion square of the file of capture.


No.885 Günther Weeth
Germany

original – 06.09.2015

Solution: (click to show/hide)

white kg2 sd7 pc3g6g5h2 black ka7 qa5 sb1e8 rg8h1 bh4h5 pa3b7c7d2f7

-8 & #1                                    (6+13)
Hoeg retractor Anti-Circe


No.885.1 Günther Weeth
Germany

version to No.885 – 04.01.2016

Solution: (click to show/hide)

white kg2 sd7 Be8 pc3g6g5h2 black ka7 qa5 sb1a4 rg8h1 bh4h5 pb7c7d2f7

-8 & #1                                    (7+12)
Hoeg retractor Anti-Circe


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