Stuck on Evil Puzzle from WebSudoku

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Stuck on Evil Puzzle from WebSudoku

Postby Babovka » Wed Jan 09, 2008 11:26 pm

I have gotten stuck and would appreciate help moving forward. Thanks in advance!

Original Puzzle:

19X X83 2XX
4XX XXX XXX
XXX XX1 84X

32X XXX XXX
XXX 867 XXX
XXX XXX X54

X78 3XX XXX
XXX XXX XX9
XX9 67X X28

Here's how far I have gotten before grid-lock:

19X 483 2XX
48X 7X6 X9X
7XX XX1 84X

32X X4X X8X
9XX 867 XX2
8XX X3X X54

X78 3XX 4XX
XXX XX8 XX9
5X9 674 X28
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Postby ArkieTech » Thu Jan 10, 2008 12:12 am

Babovka,

Look for naked pairs in blocks 3 6 and 7 and in Column 7 after these deductions it is singles all the way

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Postby Babovka » Tue Jan 29, 2008 10:12 pm

Thanks VERY much, dan. Just now had a chance to sit down with the puzzle and it all fell into place. I am not too good with naked pairs yet, but they sure did the trick.
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Joined: 17 December 2007

Stuck on Evil Puzzle from WebSudoku

Postby Cec » Wed Jan 30, 2008 12:11 pm

Babovka wrote:".. I am not too good with naked pairs yet, but they sure did the trick."

Hi Babovka,

When you solve puzzles I'm not sure whether you use pencilmarks which are explained HERE . By loading your puzzle into one of the many solver programs, such as Simple Sudoku, the following Pencilmark Grid can be produced by Copy and Paste to the Forum. This grid makes it easier to identify possible candidate eliminations, such as the "Naked Pairs" mentioned above and which, as you eventually found out, were the key to solving this puzzle.
Code: Select all
 
 *--------------------------------------------------------------------*
 | 1      9      56     | 4      8      3      | 2      67     567    |
 | 4      8      235    | 7      25     6      | 135    9      135    |
 | 7      356    2356   | 259    259    1      | 8      4      356    |
 |----------------------+----------------------+----------------------|
 | 3      2      1567   | 159    4      59     | 1679   8      167    |
 | 9      145    145    | 8      6      7      | 13     13     2      |
 | 8      16     167    | 129    3      29     | 1679   5      4      |
 |----------------------+----------------------+----------------------|
 | 26     7      8      | 3      1259   259    | 4      16     156    |
 | 26     1346   12346  | 125    125    8      | 13567  1367   9      |
 | 5      13     9      | 6      7      4      | 13     2      8      |
 *--------------------------------------------------------------------*


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