Fairy chess composition
 No.871 Rainer Kuhn &Franz Pachl (Germany) Original Problems, Julia’s Fairies – 2015 (II): July – December →Previous ; →Next ; →List 2015(II) Please send your original fairy problems to: julia@juliasfairies.com

No.871 by Rainer Kuhn & Franz Pachl – Rich strategy with final moves by half-neutral piece, previously shown by Franz Pachl in the problems for the 1st Riga Black Balsam TT. (JV)

Definitions:

Half-neutral piece: Piece which can exist in black, white or neutral state and changes its state by the rules:

• A piece in the neutral state may be moved by Black or White, and after move it changes into black or white state respectively.
• A piece in the white state may be moved only by White, and after move it changes into its neutral state.
• A piece in the black state may be moved only by Black, and after move it changes into its neutral state.
• Only a half-neutral pawn can promote into half-neutral figure.

Additional features of half-neutral pieces:

• Castling with half-neutral King is possible with hK in white phase on e1 (White castling) and hK in black phase on e8 (Black castling). After castling the hK becomes half-neutral phase and can become mate.
• A play is possible also with only one half-neutral King on the board (in white, black or neutral phase).
• By the notation: “h”=half-neutral piece, states are marked with “w”(white), “b”(black) and “n”(neutral).

Nightrider(N): (1,2) Rider. Operates along straight lines with squares lying a Knight’s move away from each other.

 No.871 Rainer Kuhn &Franz PachlGermanyoriginal – 24.08.2015 Solutions: (click to show/hide) White ka6 qb4 bc7 sf2 pf4g5 Black kf5 ra1h2 sb5 qc6 pa5b3b6e6f3g6 black halfneutral ng2 hs#3            b) Sf2→f6           (6+12)Half-neutral Nightrider g2 a) 1.Bc7*b6 hNg2-c4=n {} 2.nhNc4-e8=w {} Rh2-h5 { } 3.hNe8-g7=n + {} nhNg7-e8=b # b) wSf2-->f6 1.Qb4*a5 hNg2-e1=n {} 2.nhNe1-c2=w {} Rh2-e2 { } 3.hNc2-d4=n + {} nhNd4-c2=b # { (C+ by Popeye 4.73)}

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