## Stuck on Evil Puzzle from WebSudoku

Post the puzzle or solving technique that's causing you trouble and someone will help

### Stuck on Evil Puzzle from WebSudoku

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
Babovka

Posts: 10
Joined: 17 December 2007

Babovka,

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

dan
dan

ArkieTech

Posts: 2867
Joined: 29 May 2006
Location: NW Arkansas USA

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.
Babovka

Posts: 10
Joined: 17 December 2007

### Stuck on Evil Puzzle from WebSudoku

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      | *--------------------------------------------------------------------*`

Cec
Cec

Posts: 1039
Joined: 16 June 2005