## stuck on Fiendish grid

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

### stuck on Fiendish grid

When Judy and I worked this grid we both arrived independently at the following configuration but cannot break though it. This is a Fiendish from Grand Master.

Code: Select all
`7  9   1 | 8  6  - | 4   -  5  4  -  -  | 1  -  5 | -  9  --  2  -  | 9  4  - | -  -  1-----------------------------  -  7  | 2  1  9  | 3  -  -1  4  3  |  6  -  - | 9  5  22  -  9  |  5 3  4  | -  -  -----------------------------9  -  -  | 7  -  1  | -  6  --  7  -  | 3  -  -  | -  -  9-  1  2  | 4  9  6  | -  -  7`

What is the logic for the next step

Thank You
Leet
Leet@signalpeak.net
Leet

Posts: 1
Joined: 30 December 2005

can't see what candidates you've excluded, so here's the list straight from your puzzle.
Code: Select all
` *-----------------------------------------------------------* | 7     9     1     | 8     6     23    | 4     23    5     | | 4     368   68    | 1     27    5     | 2678  9     368   | | 3568  2     568   | 9     4     37    | 678   378   1     | |-------------------+-------------------+-------------------| | 568   568   7     | 2     1     9     | 3     48    468   | | 1     4     3     | 6     78    78    | 9     5     2     | | 2     68    9     | 5     3     4     | 1678  178   68    | |-------------------+-------------------+-------------------| | 9     358   458   | 7     258   1     | 258   6     348   | | 568   7     4568  | 3     258   28    | 1258  1248  9     | | 358   1     2     | 4     9     6     | 58    38    7     | *-----------------------------------------------------------*`

for explanation of terms, go here and here

You have an XWing on 2s and can eliminate two of them from row 8
A hidden pair (2,7) in row 2 and can eliminate other numbers from those cells
A naked pair (6,8) in row 6 and can eliminate those numbers from other cells in that row
A hidden single (6) in column 7
Locked Candidates (8) in column 7
Now you should have your next placement.
Shazbot

Posts: 220
Joined: 24 September 2005