Geoff Foster


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

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


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 Foster

original – 08.05.2015

Solutions: (click to show/hide)

Neutral Pc7 Pb6 White HalfNeutral Kg4

h#2,5         2 solutions     (1+0+2)
Half-neutral Kg4

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