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Advanced methods and approaches for solving Sudoku puzzles

Postby eleven » Sun Feb 24, 2008 10:34 pm

Just one more uniqueness note:
Code: Select all
.---------------.---------------.---------------.
| 1    9    7   | 5    2    8   | 6    4    3   |
| 8    4    3   | 7    6    1   | 9    2    5   |
| 2    6    5   | 3    4    9   | 1    78   78  |
:---------------+---------------+---------------:
| 39  +13  #14  | 6    5    7   | 2   +189 #148 |
| 5    2    8   | 1    9    4   | 7    3    6   |
| 69   7   #146 | 2    8    3   | 5   +19  #14  |
:---------------+---------------+---------------:
| 36   35   9   | 4    1    26  | 8    57   27  |
| 4    8    12  | 9    7    5   | 3    6    12  |
| 7    15   26  | 8    3    26  | 4    15   9   |
'---------------'---------------'---------------'

As hobiwan pointed out, in the UR 14 you can remove 4 from r4c9 and r6c3 (or 1 from r4c3 and r6c9 resp.).

Additionally in the 2 rows one of 1 and 4 must be outside the UR in the two rows (as boxes and columns) to destroy the deadly pattern. There are only the three 1-candiates in r4c2, r4c8 and r6c8. r4c9 sees all of them, thus 1 can be eliminated there too.
eleven
 
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Joined: 10 February 2008

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