Thanks Maurice, great puzzles ... hopefully Nikoli_Freak will re-surface again ....
I managed to find a symmetric example with an Anti-Knight top-down Rt-Lt Wrap constraint.
In this variant each cell has 8 cells which are a Knight's move away
here is a demo with cells r1c1(red), r5c2(green) & r6c6(blue) highlighted
The puzzle itself is very difficult so don't solve unaided
Text format
Code:
.........................5.......7.4...1.9...2.8.......3.........................
. . . | . . . | . . .
. . . | . . . | . . .
. . . | . . . | . 5 .
------+-------+------
. . . | . . . | 7 . 4
. . . | 1 . 9 | . . .
2 . 8 | . . . | . . .
------+-------+------
. 3 . | . . . | . . .
. . . | . . . | . . .
. . . | . . . | . . .
Solution
Code:
6 2 1 | 5 8 7 | 4 9 3
3 4 5 | 6 9 2 | 1 8 7
9 8 7 | 3 4 1 | 6 5 2
------+-------+------
1 9 3 | 2 5 8 | 7 6 4
7 5 4 | 1 6 9 | 2 3 8
2 6 8 | 7 3 4 | 5 1 9
------+-------+------
4 3 6 | 9 2 5 | 8 7 1
8 7 9 | 4 1 6 | 3 2 5
5 1 2 | 8 7 3 | 9 4 6
I have been posting these on the New Sudoku Forum ... I will try to stick to a unique topic per forum, the problem is that there are members here that are not members there and vice versa
tarek