|pieces||'Nightrider(N)', 'Half-neutral piece'|
|Half-neutral piece:||It can exist in black, white or neutral state. A piece in the neutral state 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.|
|Nightrider(N):||(1,2) Rider. Operates along straight lines with squares lying a Knight's move away from each other.|
No. 1670 Kjell Widlert
original - 04.12.2021
Nightrider h8, f8
Half-Neutral h1, a5, e3, e4
Solution: (click to show/hide)
(C+ by Popeye 4.87)
The theme from SuperProblem 232-TT doubled: nhSe4 is moved twice by Black to defend, and twice by White to mate; the same goes for nhQh1.
The variations are connected so that nhQh1 mates when nhSe4 moves, and conversely.
The variations from nhSe4 show specific crosschecks with black correction;
the variations from nhQh1 show unpin with dual avoidance.
There is also a kind of four-corner play.
I would have preferred to do without the nightriders, but the dual avoidance needs the nhQh1 to give the flight b5 in one variation, and I found no “orthodox” way.