Comment 6 for bug 397783
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| Kim spence-Jones (ksj) wrote Re: impossible game generated by Sudoko | #6 |
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OK. I have another impossible puzzle...
ab9546c3d
__8___5_7
25_______
_4_63___8
___1_8___
5___24_1_
______e26
8_5___3__
_3_2897__
Here's the proof it's impossible (numbering from 1,1 bottom left):
cell e must be 8, because rows 1 and 2 have an 8 in, and e is the only remaining free cell in bottom right-hand 3x3 group.
a and b can't be 8 because there is an 8 in the top left 3x3 group (at 3,8), and c can't be 8 because of e. d can't be 8 because of (9,6). So, there is no space for an 8 in the top row.