No.817,818 (CJF)

No.817, 818 
Chris Feather (England)

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Original Problems, Julia’s Fairies – 2015 (I): January – June

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No.817, 818 by Chris Feather – “These two problems both make their point best if solved, so I hope that at least some readers will try to solve them.” (CJF)


Definitions:

Take & Make: Having captured, a unit must immediately, as part of its move, play a non-capturing move in imitation of the captured unit from the capture-square. If no such move is available, the capture is illegal. Promotion by capture occurs only when a pawn arrives on the promotion rank as the result of a take&make move. Checks are as in normal chess: after the notional capture of the checked K, the checking unit does not move away from the King’s square.

PWC: When a capture is made, the captured unit (except a King) is replaced on the square the capturing unit just leaves. A Pawn is immovable on its 1st rank.

VAO(VA): Chinese piece operating along Bishop lines: moves as Bishop, but captures only by hopping over a hurdle to any square beyond.

Nightriderhopper(NH): (1,2) Hopper.

Diagram Anti-Circe: When a piece captures (including King), it must come back to its rebirth square (the square it occupied in the diagram position): if this square is occupied, the capture is forbidden. A Pawn capturing on its promotion rank promotes before it is reborn. (Or from Fairings No.42: As Anti-Circe except that the rebirth square for the capturing unit is the one where it stands in the diagram. In the Cheylan sub-type a capture by a unit on its own rebirth square is not allowed.)


No.817 Chris Feather
England

original – 01.06.2015

Solutions: (click to show/hide)

White kf2 vah2 pe4 Black kh1 pc7e5

h#3*(set mate in 1)                 (3+3)
Take&Make
PWC
VAO h2


No.818 Chris Feather
England

original – 01.06.2015

Solutions: (click to show/hide)

White ke5 nhf7 ph6 Black kh7

1->ser-h#14                             (3+1)
PWC
Diagram Anti-Circe
Nightriderhopper f7


2 Responses to No.817,818 (CJF)

  1. Geoff Foster says:

    No.817: Excellent economy, although the bPe5 is not needed in the real solution. The mates are very similar, with the bPc7 finishing on h2 each time, but in the real solution it promotes to VAO first! The wK not only guards 2 squares, it also acts as a hurdle and prevents promotion to Bishop. The Take&Make moves change the square colour of the wB.

  2. Geoff Foster says:

    No.818 is a simplified version of problem 11 in the latest Fairings. Here the idea is to first manoeuvre the NH to h6, which is the P’s diagram square. Because of Diagram Anti-Circe the P now cannot make a capture. The bK then manoeuvres the P to a Q promotion, then finally White moves the NH away, vacating h6 and delivering a strange battery mate. The purpose of White’s initial move (creating a hurdle for the NH) only becomes apparent at the very end!

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