# No.1223-2 (GW&KW)

 No.1223.2 version to No.1223(2018-19) Günther Weeth (Germany) & Klaus Wenda (Austria) Original Retro & PG problems JF – R2019-20

Definitions: (click to show/hide)

 No.1223.2 Günther Weeth & Klaus Wenda Germany / Austria version of No.1223(2018-19) – 24.06.2019 Ded. to Julia, the Latvian Queen of Fairies Solution: (click to show/hide) white Kf5 MWc1 Bc2 black Kh3 Qb2 Ba1b1 Sh2 Pa4a4f4h6 -7 & #1    Hoeg Retractor       (2+7) Anti-Circe Magic Wandering Unit (MWU) II wSc1 {no animation for Defensive Retractors (JV) } Solution: 1.Bd1-c2!, bSd3-c1+ (bPc2-c1=wS+? short mate) 2.wSe5-d3, bSd3-e5+ 3.wSc1- d3, bPc2-c1=wS+ (forced) 4.Kg5-f5, h7-h6+ 5.wPd5:c5 e.p.[bPc2] (here White defines the square for an uncapture (c5) according to the Hoeg convention in such a way as Black being unable to add anything other than a pawn), c7-c5 6.Kf6-g5, b4:Qc3[c7]+ 7.Kg5-f6 & fw.1.B:a4[Bf1]# Defending by playing 6...., d4:Qc3[c7]+? would be illegal due to the odd position of the pawn: wPd5 is an MWU, it is true. Yet that pawn must forcibly have come from its original square d7 (= bP). Thus no bP could have legally reached squares d2, d3, d4 by any capturing move whatsoever. Tries: 1.Bd1-c2, bSd3-c1+ ... 5.wPb5:c5e.p.[bPc2]?, c7-c5 6.Kf6-g5, d4:Qc3[c7]+ (the odd position of the pawn is avoided) 7.Kg5-f6 & fw.1.B:a4[Bf1]#. Yet Black has got a stronger move at hand: 6.Kf6-g5, d4:c4 e.p.[c7]!! According to the Hoeg convention, it is the uncapturing colour that defines the square for executing the uncapture – here c4 instead of c3 - in accordance with legality. It is only the uncaptured unit that can be chosen by White in this case. But there White has got no choice and fails to win the wQ necessary for mating. In the solution the analogous uncapture of 6..., b4:c4e.p.[c7]+ would be illegal as the diagonal b2-f6 remains open with the wK still exposed to check. 1.Bb3-c2?, bSd3-c1+ ... 5.wPd5:c5e.p.[bPc2], c7-c5 6.Kf6-g5, b4:Qc3[c7] means illegal retro check. So White is obliged to occupy the wQ’s repulse square in the key move as a precaution. Minor attempt: 1.Bd1-c2, bSd3-c1+ 2.Kg5-f5?, h7-h6+ 3.Kg6-g5?, g7:Qh6[h7]+! 4.Kg5- g6?/Qh4-h6?/Qg5-h6? & fw.1.B:a4[Bf1]+, Kg3!/K:h4[Ke8]!/S:f1[Sg8]! The defence 3.Kg6-g5, g5:Qh4[h7]+? 4.Kf7-g6 & fw.1.B:a4[Bf1] would not be sufficient. Idea: White’s plan is focussed on creating a bP as an MWU which will later – having become a wP – uncapture a bP that is - in its turn - forced to uncapture the wQ necessary for mating. (For further information as to e.p.-uncaptures in AC retractors, see K.Wenda, -3 & #1, Hoeg AntiCirce, Die Schwalbe 268/2014, 16052 with a detailed comment by GWe) (Authors)

### One Response to No.1223-2 (GW&KW)

1. Paul Rãican says:

A black Pawn a2 is missing? (it avoids Ba2-b1+)