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Jun 3, 2007 VH
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue Jun 05, 2007 5:09 pm    Post subject: Reply with quote
KSipher wrote:
Thanks for the help. I can get to this point and then I don't see the skyscraper in columns 4 and 8. Can you explain this step to me? Thanks so much!

Kathy

Code:

+---------------+---------------+-------------+
| 259   8    7  | 569 3     69  | 4  1259 129 |
| 59    4    1  | 2   59    8   | 6  3    7   |
| 6     259  3  | 7   1     4   | 25 8    29  |
+---------------+---------------+-------------+
| 1     257  45 | 8   27    3   | 9  247  6   |
| 2379  2379 6  | 4   279   5   | 8  127  123 |
| 23479 2379 8  | 1   6     279 | 23 47   5   |
+---------------+---------------+-------------+
| 457   6    45 | 3   24579 279 | 1  259  8   |
| 8     357  2  | 59  4579  1   | 35 6    349 |
| 34    1    9  | 56  8     26  | 7  25   34  |
+---------------+---------------+-------------+


In each of columns 4 and 8 there are only two possibilities for a 9. The columns share one of those possibilities in row 1. Both columns can't have their 9 in row 1, so one of the other possibilities must be a 9. Any cells that see both of those other possibilities can't be a 9. Those cells that see both are r8c9, r7c5 and r7c6.

Hope that's clear.
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KSipher



Joined: 24 Sep 2006
Posts: 38
PostPosted: Tue Jun 05, 2007 5:12 pm    Post subject: Reply with quote
Got it! And I even understand it - miracle! Now, if only I can spot a skyscraper all by myself....

Thanks so much!
Kathy
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eddieg



Joined: 12 Jan 2006
Posts: 47
Location: San Diego, CA USA
PostPosted: Tue Jun 05, 2007 7:31 pm    Post subject: Thanks Kathy Reply with quote
I couldn't figure it out either. I hadn't gottin (some good english there) around to asking for help, so thanks for helping me get a resolution.

I can sleep now.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue Jun 05, 2007 9:25 pm    Post subject: Reply with quote
Kathy,

I forgot to mention...in your latest grid, there are more eliminations that can be made from that 35-25-23 XY-Wing, specifically the 2s in column 8 of box 6.
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drb



Joined: 04 Jul 2007
Posts: 2
PostPosted: Wed Jul 04, 2007 3:38 am    Post subject: Reply with quote
Code:

------------------------------------------------------------
259                : 569         69     :       1259 129
59                 :       59           :
      259          :                    : 25          29
............................................................
      257   45     :       27           :       247
2379  2379         :       279          :       127  123
23479 2379         :             279    : 23    247
............................................................
457         45     :       24579 279    :       259
      357          : 59    4579         : 35          349
34                 : 56          26     :       25    234
------------------------------------------------------------


Please forgive me as I am new to the forums and am still learning some various solving methods but I am stuck here. I asked for a hint and was given the 1 in r5c8 but I can't see how that is derived from what I have solved so far. Anyone interested in helping me get a little more sophisticated in this sudoku world? Wink

Thanks, Dan
________
Suzuki GSX-R Series

Last edited by drb on Tue Feb 01, 2011 8:51 pm; edited 1 time in total
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Jul 04, 2007 5:09 am    Post subject: Reply with quote
drb wrote:
Code:

------------------------------------------------------------
259                : 569         69     :       1259 129
59                 :       59           :
      259          :                    : 25          29
............................................................
      257   45     :       27           :       247
2379  2379         :       279          :       127  123
23479 2379         :             279    : 23    247
............................................................
457         45     :       24579 279    :       259
      357          : 59    4579         : 35          349
34                 : 56          26     :       25    234
------------------------------------------------------------


Please forgive me as I am new to the forums and am still learning some various solving methods but I am stuck here. I asked for a hint and was given the 1 in r5c8 but I can't see how that is derived from what I have solved so far. Anyone interested in helping me get a little more sophisticated in this sudoku world? Wink

Thanks, Dan


Dan, welcome to the forum. In row 9 the 256 triple gets rid of the 2 in r9c9. Now box 9's 2 has to be in column 8, so other 2s in that column get eliminated. Now the 47 pair in box 6 forces the 1 in r5c8.

Take a look at this site and see if it's what you're looking for.

http://www.sudopedia.org/wiki/Main_Page
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drb



Joined: 04 Jul 2007
Posts: 2
PostPosted: Wed Jul 04, 2007 5:31 am    Post subject: Reply with quote
Thanks Marty, that makes perfect sense. I need to get my head around some of these patterns so I see them without help.

Dan
________
IFA DICUSSION
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