Original Problems, Julia’s Fairies – 2014 (II): May – August
Please send your original fairy problems to: email@example.com
No.547 by Rainer Kuhn – A very specific twin of this problem shows the different implementation of combination Mirror-Circe + Take&Make in two solving programs – Popeye and WinChloe! Author mentions also that “the idea was reinforced by the comment from Georgy Evseev to No. 529.” (JV)
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.
Mirror Circe: Like Circé, but the rebirth square of a piece is the square occupied at the beginning of an orthodox game by a piece of the same kind and of the other side. Related to the square they occupied before the rebirth:
- Rooks, Bishops and Knights are reborn on the square of the same color.
- Pawns (including fairy Pawns) are reborn on the same file.
- Other fairy pieces are reborn on the same file and on the promotion rank of the other side.
No.547 Rainer Kuhn
original – 21.05.2014
Take & Make
a) priority to Mirror-Circe
b) priority to Take&Make
Solutions: (click to show/hide)
a) 1.- Bf3! 2.a1=B B×g4(Bd7;Bf1) 3.Be5 K×f1(Ka6) 4.Bb8 Bc6#
b) 1.- Bh1xe4-e3[+bPe2]! 2.f4xe3-a7[+wBf8] Ke1xf2-f4[+sRa1] 3.Ra1-f1 + Kf4xg4-c8
(a) C+ WinChloe 3.25 ; b) C+ by Popeye 4.65)
As the problem No. 529 was published with JF I only had a little anticipation that there exists a clash between the fairy condition Take&Make and Mirror-Circe (or any other form of Circe). The definition gap occurs if a capture (Take-Move) happens on a rebirth square of the captured piece. It’s not clear what will come first: The possible Mirror-Circe rebirth and then the Make-Move or execute completely Take&Make and then the possible Mirror-Circe rebirth. In dependence on this a solution can be prevented or enabled. The solving program WinChloe uses the first definition and Popeye the second. So the idea for this problem was born to show both possibilities in one position. As well the idea was reinforced by the comment from Georgy Evseev to No. 529. (Author)