## Another difficult on (for me)

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

### Another difficult on (for me)

Hi,

I am still learning, trying to solve some "hard" sudokus, this is how far I've gone, but I have no clue how to continue. Any help is appreciated

Code: Select all
`289   7      29   | 1     3      59    | 4     58     63     69     5    | 4789  46     679   | 2     78     168    4      1    | 578   2      567   | 57    3      9------------------+--------------------+-------------------24    235    234  | 25_7_ 8      1     | 6     9      472469  2569   2469 | 257   57     3     | 8     1      477     1      8    | 49    46     69    | 3     2      5------------------+--------------------+-------------------469   69     4679 | 3     19     28    | 157   57     281     8      23   | 57    57     4     | 9     6      235     239    2379 | 6     19     28    | 17    4      238`

Source: http://www.denksport.de/braingymnastik/sudoku/default.asp?l=4&a=3

Thanks alot.
Last edited by Jackie78 on Sat Nov 15, 2008 6:54 pm, edited 3 times in total.
Jackie78

Posts: 7
Joined: 08 March 2008

Try to determine where 7 can go in row 4. After that, look for a naked pair in column 2.

For those with more background, note the UR1 that places a 2 in r5c4, immediately reducing the puzzle to singles.
re'born

Posts: 551
Joined: 31 May 2007

Hello reborn,

sorry there was a typo in my pencilmarks in r4c4, I have a 7 instead of a 6 here, do you have another hint how to solve it?
Jackie78

Posts: 7
Joined: 08 March 2008

all the 5s & 7s in Column 6 are also confined to box 2 ...

This means that the 5s & 7s are locked in that intersection (column 6 & box 2)...

Therefore you can safely eliminate 5 & 7 (box 2 but outside the above intersection) from r3c4 leaving a naked single there.

tarek

tarek

Posts: 2807
Joined: 05 January 2006