Advanced methods and approaches for solving Sudoku puzzles

There are no 8s in this puzzle, hence the 8 in most cells - some are in pairs and in threes, not sure how to do deal with them? what next?

278,248,578/ 589,6,1/47,3,479
6,9,3/2,7,4/158,18,58
1,48,578/589,3,58/2,6,479

378,38,678/37,458,2/34568,489,1
238,5,68/1,48,9/3468,7,2468
4,1238,1789/6,58,37/358,289,2589

9,6,2/578,1,578/478,48,3
38,138,18/4,2,67/9,5,67
5,7,4/38,9,368/168,128,268
Kites

Posts: 48
Joined: 20 May 2005

There's no general problem with a sudoku not having one number present in the clues, nor any particular way to attack that type (that I know of). This puzzle specifically, though, is a different matter. There's certainly nothing simple to do, though it can be solved with the extreme methods that make my head hurt.
PaulIQ164

Posts: 533
Joined: 16 July 2005

Consider naked triple in row 4
Jeff

Posts: 708
Joined: 01 August 2005

[quote="PaulIQ164"]There's no general problem with a sudoku not having one number present in the clues, nor any particular way to attack that type (that I know of). This puzzle specifically, though, is a different matter. There's certainly nothing simple to do, though it can be solved with the extreme methods that make my head hurt.[/quote]

Hi Paul,
Su Doku puzzles with one number not present are not a problem, my comment was only a bit of information. However, I would like to learn how the tuckle these more difficult puzzles and know which method to apply.
Kites

Posts: 48
Joined: 20 May 2005

[quote="Jeff"]Consider naked triple in row 4[/quote]

Thanks Jeff, but still doesn't seem to get the puzzle moving
Kites

Posts: 48
Joined: 20 May 2005

[quote="Kites"][quote="Jeff"]Consider naked triple in row 4[/quote]

Thanks Jeff, but still doesn't seem to get the puzzle moving[/quote]

Sorry, I have got. Thanks very much.
Kites

Posts: 48
Joined: 20 May 2005

Could you post the original - it looks a bit odd in R4.

Should it look like this?

Code: Select all
[278]  [248]  [578]  [589] 61 [4578] 3 [45789]
693274 [158]  [18]  [58]
1 [48]  [578]  [589] 3 [58] 26 [45789]
[378]  [38]  [6789]  [3578]  [458] 2 [34568]  [489] 1
[238] 5 [68] 1 [48] 9 [3468] 7 [2468]
4 [1238]  [1789] 6 [58]  [3578]  [358]  [289]  [2589]
962 [578] 1 [578]  [478]  [48] 3
[38]  [138]  [18] 42 [3678] 95 [678]
574 [38] 9 [368]  [168]  [128]  [268]

cos if it does - it falls apart very easily.

stuartn
stuartn

Posts: 211
Joined: 18 June 2005

[quote="stuartn"]Could you post the original - it looks a bit odd in R4.

Ta

stuartn[/quote]

Today's Sunday Times Magazine Sudoku - The superior version (page 51)
... ... .3.
.93 .74 ...
1.. .3. 26.

... ..2 ..1
.5. 1.9 .7.
4.. 6.. ...

.62 .1. ..3
... 42. 95.
.7. ... ...

Not sure what's the problem, please let me know. I have now solved the puzzle.
Kites

Posts: 48
Joined: 20 May 2005

I'm hoping that your original transcription was slightly out - either that or my head is.

stuartn
stuartn

Posts: 211
Joined: 18 June 2005

### puzzle starter for Kites...

I see that over at the end of Row 4 you show a 489. That is the only mention of a 9 for that row, so it must be good. Go from there.

I'm new at this, so don't crucify me if I have the logic wrong.
fang

Posts: 1
Joined: 11 September 2005