Fairy chess composition

# No.794 (GF)

 No.794 Geoff Foster(Australia) Original Problems, Julia’s Fairies – 2015 (I): January – June    →Previous ; →Next ; →List 2015(I) Please send your original fairy problems to: julia@juliasfairies.com

No.794 by Geoff Foster – Half-neutral King in Back-to-Back! (JV)

Definitions:

Back-To-Back: When pieces of opposite colors stand back-to-back with each other on the same file (white piece is on the top of black!), they exchange their roles. A pawn on the first rank cannot move. Any piece can make an en passant capture when it has got a role of Pawn by Back-To-Back.

Half-neutral piece: It can exist in black, white or neutral state. A piece in the neutral state (including Kings) may be moved by Black or White, after which it changes into black or white state respectively. A piece in the black state may be moved only by Black, after which it changes into its neutral state, and similarly for White. By the notation: “h” = half-neutral piece, states are marked with “w”(white), “b”(black) and “n”(neutral). Castling is possible with orthodox (or Circe- reborn) Rooks and half-neutral King (in white phase by white castling and in black phase by black castling). After such castling move, the Kings becomes half-neutral, and could be checked or even mated. This is a special rule for the half-neutrals.

 No.794 Geoff FosterAustraliaoriginal – 08.05.2015 Solutions: (click to show/hide) Neutral Pc7 Pb6 White HalfNeutral Kg4 h#2,5         2 solutions     (1+0+2)Back-to-BackHalf-neutral Kg4 1...nPb6-b7 2.nPc7-c5 nPb7-b8=nQ 3.nQb8-g3 + hKg4-c4=nhK # {display-departure-square} 1...nPc7-c8=nR 2.nPb6-b5 nRc8-c3 3.nRc3-g3 + hKg4-b4=nhK # {display-departure-square} { (C+ by Popeye 4.69)} In both solutions Black gives check to the half-neutral King when it is in White Phase. The halfneutral King must leave White Phase before White can mate it. (Author)

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