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killer sudoku duplicate numbers
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Posted on: Thu Aug 23, 2012 5:03 am

Posts: 422
Joined: Fri May 13, 2011 2:43 am
killer sudoku duplicate numbers
Ok, no duplicate numbers in a cage is a rule for killer sudokus. But there is an L-shaped cage in August 23rd difficult puzzle (25) that can only be satisfied by the numbers 8,9,8 or 9,7,9...

Posted on: Thu Aug 23, 2012 12:27 pm

Posts: 2281
Joined: Thu May 12, 2011 11:58 pm
Re: killer sudoku duplicate numbers
sneaklyfox wrote:
Ok, no duplicate numbers in a cage is a rule for killer sudokus. But there is an L-shaped cage in August 23rd difficult puzzle (25) that can only be satisfied by the numbers 8,9,8 or 9,7,9...

Thanks for this, I realize now that by "merging" single cell cages I opened a can of worms :-(

Bottom line is that the merging happens at the wrong stage of the process, will fix..

Patrick

Posted on: Thu Aug 23, 2012 5:37 pm

Posts: 116
Joined: Sat May 14, 2011 3:18 am
Re: killer sudoku duplicate numbers
sneaklyfox wrote:
Ok, no duplicate numbers in a cage is a rule for killer sudokus. But there is an L-shaped cage in August 23rd difficult puzzle (25) that can only be satisfied by the numbers 8,9,8 or 9,7,9...

I don't see why "no duplicate numbers in a cage" has to be a rule for Killer Sudoku in cases (such as the one you mention) where the cage straddles two 3x3 grids. There is thus no violation of the 1-9 unique values in any 3x3 or in any row or column...

What am I missing? At the time I checked last, 48 people (including me) had solved the puzzle, so it doesn't seem to be a big deal...

Posted on: Thu Aug 23, 2012 6:06 pm

Posts: 2281
Joined: Thu May 12, 2011 11:58 pm
Re: killer sudoku duplicate numbers
pharosian wrote:
What am I missing? At the time I checked last, 48 people (including me) had solved the puzzle, so it doesn't seem to be a big deal...

It's a convention thing. At some point people settled on "no duplicates".

And once you know that that is a rule, it'll help you solve it of course.

On one particular forum someone even wrote "your puzzles are _not_ Killer Sudoku, use a different name" (!)

(math/puzzle people can be quite particular )

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