|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). Captures on the rebirth square are allowed in Anti-Circe Calvet and not allowed in Anti-Circe Cheylan. Game array squares are determined as in Circe: 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.|
|stipulations||'Proca Retractor', '-N & #1'|
|-N & #1:||The stipulation means: retract N moves and than mate in 1.|
|Proca Retractor:||The one of the Defensive Retractors, where 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.
No. 1612 Günther Weeth+ &
Klaus Wenda &
Vlaicu Crișan Germany / Austria / Romania
original - 19.05.2021
Dedicated to Andreas Thoma
Solution: (click to show/hide)
--Sorry, no animation for this kind of problems (JV)
-1.Be1:Bd2(>Bc1)! Bc3-d2+ (1st occurrence) -2.Kf4-e3 Bg1-h2+ -3.Ke3-f4 Bh2-g1+ (2nd occurrence) -4.Kf4-e3 Bg1-h2+ -5.Ke3-f4 Pg2-g1=B+ (forced)
Second preparatory plan chasing the black King from the center of the board to the edge: -6.Kd2-e3 Bh8-c3+ -7.Kc3-d2 Ke5-d5+ -8.Kd4-c3 Kf6-e5+ -9.Ke5-d4 Kg7-f6+ -10.Kf6-e5 Kf8-g7+! -11.Ke7-f6 Kg7-f8+!
Main plan decoys the black King to g8 where he can be mated: -12.Pb5:a6ep.(>a2) Pa7-a5 (1st occurrence) -13.Kf6-e7 Kf8-e7+ -14.Ke7-f6 Kg7-f8+ (2nd occurrence) -15.Kf6-e7 Kf8-e7+ -16.Ke7-f6 Kg8-f8+ (forced) -17.Bc3-e1 & forward play 1.Ph7#
a) -1.Kd2-e3? Rb3-b2+ -2.Bc1:Rb2(>Bc1) Rb1-b2+ -3.Bd4:Pe3(>Bc1) Pe4-e3+ & forward defense 1...Pe1=Q# b) -1.Kd2-e3? Rb3-b2+ -2.Bc1:Rb2(>Bc1) Rb1-b2+ -3.Bb6:Pe3(>Bc1) Pe4-e3+ -4.Ke1-d2 Rb2-b1+ & forward defense 1...Sd3#
(C-; but has been checked intensively by Andreas T. and Pacemaker (Authors))
Replacing No.1440 (Weeth & Wenda) which had to be eliminated from the tourney retros JF 2019-20 due to a cook. Vlaicu found a new position which offers much more than a constructive fixing of 1440. The content of the problem is enriched with a second preparatory plan and the number of units is reduced from 10 to 9.That´s an essential improvement.