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Over (Vanilla?)

 
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HATMAN
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Joined: 06 Jan 2008
Posts: 16
Location: Britain, Turkey

PostPosted: Mon Jan 14, 2008 12:50 pm    Post subject: Over (Vanilla?) Reply with quote

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.



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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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Joined: 30 Dec 2005
Posts: 601

PostPosted: Mon Jan 14, 2008 7:30 pm    Post subject: Reply with quote

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.
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HATMAN
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Joined: 06 Jan 2008
Posts: 16
Location: Britain, Turkey

PostPosted: Mon Jan 14, 2008 8:33 pm    Post subject: Reply with quote

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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Location: Britain, Turkey

PostPosted: Tue Jan 15, 2008 10:21 pm    Post subject: Reply with quote

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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Location: Britain, Turkey

PostPosted: Fri Jan 25, 2008 9:50 pm    Post subject: Reply with quote

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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