The New Sudoku Players' Forum

[barry]

Hi,

I'm currently stuck on a puzzle which is regarded as fiendish. I think it regards techniques which I have not yet learned, or is unsolvable!

http://i48.tinypic.com/34dn8n8.jpg

Many thanks,
Barry

[ronk]

barry, welcome to the forum.

A sudoku grid with givens, placements, and candidates for placement is called pencilmarks or pencilmark grid. Pencilmarks in text form makes possible their cut&paste into a reader's solver of choice. For the current state of your puzzle ...

Code: Select all

 24    7     234   | 5     34    1     | 8     6     9
 8     35    9     | 6     34    2     | 345   1     7
 1     6     345   | 9     8     7     | 2345  345   245
-------------------+-------------------+-----------------
 3     159   8     | 7     2     6     | 145   459   45
 2459  259   7     | 3     1     49    | 6     8     245
 2469  129   246   | 8     5     49    | 1247  479   3
-------------------+-------------------+-----------------
 569   359   356   | 4     7     8     | 35    2     1
 27    4     123   | 12    6     5     | 9     37    8
 257   8     125   | 12    9     3     | 457   457   6

... look at the possible locations for digit 4 in row 4, and for digit 2 in column 2. For an additional hint on these two moves, see the "Locked Candidates 2" technique here.

[barry]

Excellent! The puzzle is now solved.

Many thanks,
Barry