Fairy chess composition

# No.539 (VC)

 No.539 Vlaicu Crișan (Romania) Original Problems, Julia’s Fairies – 2014 (II): May – August   →Previous ; →Next ; →List 2014(II) Please send your original fairy problems to: julia@juliasfairies.com

No.539 by Vlaicu Crișan – Proca Retractor with a very rich content! (JV)

Definitions:

Proca Retractor: In 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. Proca is a defensive retractor. Given a choice, Black will retract those moves that avoid or delay White’s goal. Black may defend by mating White through a forward move, if such an opportunity exists after one of Black’s retractions. Unless otherwise specified, forward defense is the default condition of Proca retractors.(def. from StrateGems, http://strategems.net/sections/variant-definitions.html)

Circe Assassin: Like Circe, but when the rebirth square is occupied, the occupant is «assassinated» (replaced) by the captured unit.

Circe: Captured units (not Ks) reappear on their game-array squares, of the same colour in the case of pieces, on the file of capture in the case of pawns, and on the promotion square of the file of capture in the case of fairy pieces. If the rebirth square is occupied the capture is normal.

 No.539 Vlaicu Crișan Romania original – 01.05.2014   6 Proca Retractor & s#1    (7+10) (C-)Circe Assassin     Solutions: (click to show/hide)   1.g6xRh7(Ra8, -wBa8) Ba6-b7+2.f5xg5(pg7) ep. g7-g53.Kf2-f1 e7-e6+4.Sf1xpe3(pe7, -wSe7) e4-e3+5.Kg2xSf2(Sb8, -bSb8) Sf6-h5+6.Qb1xSb8(-wQb8) & 1.Rc8+ Sxh1(Sb1, -bQb1)# Note: 5.Kg2xSf2(Sb8, -wQb8)?? doesn’t work because wQ attacks the black King via bPd6. The only reason for letting a bSb8 is that the passive annihilation of wQ leads to an illegal specific check. After 1.Rc8+ black is checked, because the King stays on the rebirth square of bPd3 which is under wQb1 attack. The pawn can’t go further, because it will fall under wSf1attack. Black King can’t go on e7, because bPe4 is under wBa8 attack. The only possibility to parry the check is a passive annihilation of wQb1 by capturing wSh1 which subsequently reborn on b1. In the final position, white is mated because the King stays on the rebirth square of wPg3 which is under bSh1 attack. The pawn can’t go further, because it will fall under bSf6 attack. White King can’t go on h2, because wPh3 is under bRh7 attack, on g1 because wSe7 is under bKd7 attack and h1 because wRc8 is under bKd7 attack. Passive suicides of wB and wS, passive annihilation of bS and active suicide of wQ in the retro play forming a battery. Passive annihilation of wQ in the forward play. (Author)

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Kjell Widlert
May 5, 2014 03:10

Yes, probably extremely difficult to solve – with a lot of details making full use of both ways of checking in Assassin Circe (the traditional way, and – if a K is on a rebirth square – attacking a piece that would be reborn on that square).

But seemingly no clear theme to connect all those details.

Vlaicu Crisan
May 6, 2014 09:06

The starting point was to give mate by moving the Knight in the corner – similar with the Winter TT of Springaren. Afterwards a whole “bag of tricks” ensued…

May 6, 2014 23:50

A tremendous idea: White give check to a black Pawn and Black give checkmate to an white Pawn. A serious candidate for a Prize and a very good promoter of Proca Circe Assassin genre. See others problems in http://quartz.chessproblems.ca/pdf/36/Quartz36.pdf

Bojan Bašić
March 27, 2020 02:27

Hello,

I might be missing something, but this seems like a cook:

1.g6xRh7 (Ra8, -wBa8) Ba6-b7+
2.f5xg5 (pg7) ep. g7-g5
3.Kg2-f1 Sf6-h5+
4.Kh2xPg2 (pg7, -wpg7) Sh5-f6+
5.Sg4xSe3 (Sb8, -wRb8) & 1.Sf6+ Sxf6(Sg1)#

Vlaicu Crisan
April 1, 2020 21:05

Congratulations for finding this cook, Bojan! You actually confirm what the judge and his cook-hunter have written in the award.

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