Need help with a tricky puzzle.

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

Need help with a tricky puzzle.

Postby kingnautilus » Mon Feb 20, 2006 6:02 pm

Hello, I'm pretty new and don't know of many strategies, so feel free to give them to me (with examples of course).

This is the 140th puzzle in "Su Doku for Dummies". I have done all the puzzles preceding it.

Right now I'm trying to go for speed in solving, but I have come to an abrupt stop on this puzzle:

**9 54* *7*
562 187 943
**4 6*9 *5*

95* 46* 32*
*4* *** *95
**8 *95 *64

4** *** 5**
*85 974 *32
*9* *56 4**

Most likely, I am so fixated that I overlooked some kind of obvious step. Feel free to help me out.
kingnautilus
 
Posts: 4
Joined: 17 February 2006

Postby CathyW » Mon Feb 20, 2006 6:12 pm

Code: Select all
 *-----------*
 |..9|54.|.7.|
 |562|187|943|
 |..4|6.9|.5.|
 |---+---+---|
 |95.|46.|32.|
 |.4.|...|.95|
 |..8|.95|.64|
 |---+---+---|
 |4..|...|5..|
 |.85|974|.32|
 |.9.|.56|4..|
 *-----------*
 
 *--------------------------------------------------------------------*
 | 138    13     9      | 5      4      23     | 1268   7      168    |
 | 5      6      2      | 1      8      7      | 9      4      3      |
 | 1378   137    4      | 6      23     9      | 128    5      18     |
 |----------------------+----------------------+----------------------|
 | 9      5      17     | 4      6      18     | 3      2      178    |
 | 12367  4      1367   | 2378   123    1238   | 178    9      5      |
 | 1237   1237   8      | 237    9      5      | 17     6      4      |
 |----------------------+----------------------+----------------------|
 | 4      1237   1367   | 238    123    1238   | 5      18     16789  |
 | 16     8      5      | 9      7      4      | 16     3      2      |
 | 1237   9      137    | 238    5      6      | 4      18     178    |
 *--------------------------------------------------------------------*


Naked pair in box 9 should help! (I know, can't see the wood for the trees sometimes and we've all had those why couldn't I see that before moments!)
Were you trying to solve this without candidates? It usually helps to post your candidate list as well so we know what you've eliminated or not.

For techniques I'd recommend www.angusj.com/sudoku and www.simes.clara.co.uk/programs/sudokutechniques.htm or searching through the Advanced Techniques forum.
CathyW
 
Posts: 316
Joined: 20 June 2005

Postby tarek » Mon Feb 20, 2006 6:15 pm

hi there kingnautilus,

Unfortuanately there is no way of telling where you've reached in your solution, but I hope this helps:

IN column 9, where would you place a 9

IN column 9, where would you place a 6


Tarek
User avatar
tarek
 
Posts: 2647
Joined: 05 January 2006

Postby kingnautilus » Mon Feb 20, 2006 6:47 pm

Thanks guys. With your help, I've reached this:

**9 54* *76
562 187 943
**4 6*9 *5*

95* 46* 32*
*4* *** *95
**8 *95 *64

4** *** 589
*85 974 632
*9* *56 417

At this point I should be able to finish the rest of the puzzle. Thanks for the help :>
kingnautilus
 
Posts: 4
Joined: 17 February 2006

Postby windbell » Tue Feb 21, 2006 4:18 pm

kingnautilus wrote:Thanks guys. With your help, I've reached this:

**9 54* *76
562 187 943
**4 6*9 *5*

95* 46* 32*
*4* *** *95
**8 *95 *64

4** *** 589
*85 974 632
*9* *56 417

At this point I should be able to finish the rest of the puzzle. Thanks for the help :>


Code: Select all
819   543   276
562   187   943
734   629   851

957   461   328
641   238   795
328   795   164

476   312   589
185   974   632
293   856   417


Check the number 9 at R7C9~:D
windbell
 
Posts: 6
Joined: 21 February 2006


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