# No.794 (GF)

 No.794 Geoff Foster(Австралия) Оригинальные задачи, Julia’s Fairies – 2015 (I): январь – июнь    →Предыдущая ; →Следующая ; →Список 2015(I) Пожалуйста, присылайте свои оригинальные сказочные задачи на: julia@juliasfairies.com

No.794 – Geoff Foster – Полунейтральный король в Back-to-Back! (JV)

Определения:

Back-To-Back: Если фигуры противоположных цветов стоят спиной к спине на одной вертикали (белая над черной!), то они меняются ролями. Пешка на первой линии не может двигаться. Любая фигура может сделать en passant взятие, если она получила роль пешки по условию 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)