Over (Vanilla?)

Our daily <a href="http://www.sudocue.net/windoku.php">Windoku</a> puzzles, a.k.a. NRC Sudokus, are a real challenge, comparable to the Daily Nightmare.
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HATMAN
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Over (Vanilla?)

Post by HATMAN »

OV 1A: AK AN WW NC OverVanilla

I've been putting up OverKillers on DJapes site, and I've been considering a Vanilla version (check: http://www.djape.net/sudoku/forum/viewtopic.php?
or
http://www.djape.net/sudoku/forum/viewtopic.php?t=1221)

The rules are:
there are 10 numbers 0,1,2,3,4,5,6,7,8,9
one number is repeated nine times the other nine are repeated 8 times.

It is also Wide Windows, Non-consecutive, AntiKing and Anti-kNight (this format has only 36 solutions)

This replacement is now reasonably hard - perhaps not as hard as is required on this site.


Image
Last edited by HATMAN on Fri Jan 25, 2008 9:42 pm, edited 2 times in total.
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Ruud
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Post by Ruud »

1 4 7 0 8 2 9 3 6
5 8 2 9 3 6 0 7 1
9 3 6 4 7 1 8 2 5
4 7 1 8 0 5 3 6 9
8 2 5 3 6 9 7 0 4
0 6 9 7 1 4 2 5 8
7 1 4 2 5 0 6 9 3
2 5 8 6 9 3 1 4 0
6 0 3 1 4 7 5 8 2

Several constraints are redundant - several times.
HATMAN
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Post by HATMAN »

Ruud

Agree - this is the first time I've built a puzzle in reverse. Normally I have a core structure and work forward until its unique then add bits until it's solvable.

In this one I started with one of the 36 solutions added a set of zeros that were non-consecutive with the 1s (but I could not find one that was also NC with the 9s as well).

I then went round removing cell values, where the alternate possibilities would not work.

THEN I STOPPED - MUCH MORE CAN BE DONE (note a standard Sudoku in this format only needs 2 cell values to be human solvable)- I suggest you minimise it (please) as a challenge to me and hopefully Cathy W.
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HATMAN
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Post by HATMAN »

Ruud

My appologies for the simplicity of the puzzle. I've just solved it and it's probably the easiest I've ever posted.

Maurice
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HATMAN
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Post by HATMAN »

I've increased the difficulty on OV1 (to fit in with Ruud's view of his site) and out of cussedness will continue to try and make it harder.

Unfortunately, I believe, my original instincts were correct and this works best as a killer. In a killer you can make some positive "it must be" decisions whereas in vanilla it becomes just about elimination. There is some possibility with multiple LOLs - but we will see.
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