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Oct 29 vh

 
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

PostPosted: Mon Oct 29, 2007 7:25 am    Post subject: Oct 29 vh Reply with quote

one xy-wing, and - poof!
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re'born



Joined: 28 Oct 2007
Posts: 80

PostPosted: Mon Oct 29, 2007 11:22 am    Post subject: Re: Oct 29 vh Reply with quote

nataraj wrote:
one xy-wing, and - poof!


Alternatively, there is a UR type 1 in r13c59<78> which implies r1c9=6, solving the puzzle.
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Mon Oct 29, 2007 1:57 pm    Post subject: Reply with quote

I used the same UR in C59 - but also needed an X-wing on 7s in C59. Though I'm never sure whether X wings count as an "advanced technique".
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re'born



Joined: 28 Oct 2007
Posts: 80

PostPosted: Mon Oct 29, 2007 3:52 pm    Post subject: Reply with quote

cgordon wrote:
I used the same UR in C59 - but also needed an X-wing on 7s in C59.

Would you show the position where you needed it?
cgordon wrote:

Though I'm never sure whether X wings count as an "advanced technique".

I wouldn't count them as a basic technique, i.e., if I needed an x-wing to solve a puzzle, I would say so in a solution.
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Mon Oct 29, 2007 4:00 pm    Post subject: Reply with quote

Quote:
Would you show the position where you needed it?


C59
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Mon Oct 29, 2007 4:04 pm    Post subject: Reply with quote

The Type 1 UR on 78 also did it for me.
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re'born



Joined: 28 Oct 2007
Posts: 80

PostPosted: Mon Oct 29, 2007 5:43 pm    Post subject: Reply with quote

cgordon wrote:
Quote:
Would you show the position where you needed it?


C59

I mean could you show me the state of your puzzle when you needed it. Razz
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Mon Oct 29, 2007 8:00 pm    Post subject: Reply with quote

Quote:
I mean could you show me the state of your puzzle when you needed it.


Re'born: I did the puzzle again, to get to the same state, and noticed that I had used an x-wing to establish the 7 in R2C3. I now see that I could have used an alternate technique - naked singles - given that R2C3 was the only 7 in Row 2. You could ask what kinda state was I in !!
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re'born



Joined: 28 Oct 2007
Posts: 80

PostPosted: Mon Oct 29, 2007 10:24 pm    Post subject: Reply with quote

cgordon wrote:
Quote:
I mean could you show me the state of your puzzle when you needed it.


Re'born: I did the puzzle again, to get to the same state, and noticed that I had used an x-wing to establish the 7 in R2C3. I now see that I could have used an alternate technique - naked singles - given that R2C3 was the only 7 in Row 2. You could ask what kinda state was I in !!

Very good. This means I probably didn't make a mistake when I solved it. There's nothing like finding out that you've made an insane leap in a puzzle, but lucked into a solution anyway. The only thing worse is when you aren't so lucky. Laughing
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George Woods



Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK

PostPosted: Mon Oct 29, 2007 10:55 pm    Post subject: Re: Oct 29 vh Reply with quote

nataraj wrote:
one xy-wing, and - poof!

Code:

+-------------+------------+---------------+
| 1  389  389 | 2   78  5  | 4     689 678 |
| 6  89   7   | 1   3   4  | 5    89   2   |
| 5  2    4   | 9   78  6  | 138  138  78  |
+-------------+------------+---------------+
| 9  68   5   | 7   4   2  | 168  168  3   |
| 23 7    23  | 6   1   8  | 9    5    4   |
| 4  1    368 | 35  59  39 | 7    2    68  |
+-------------+------------+---------------+
| 7  356  236 | 358 568 1  | 2368 4    9   |
| 8   45  369 |  45 2   39 | 36   7    1   |
| 23 3469 1   | 348 689 7  | 2368 368  5   |
+-------------+------------+---------------+

[url=http://www.dailysudoku.com/sudoku/play.shtml?p=1:389:389:2:78:5:4: 689:678:6:89:7:1:3:4:5:89:2:5:2:4:9:78:6:138:138:78:9:68:5:7:4:2:168:168:3:23:7:23:6:1:8:9:5:4:4:1:368:35:59:39:7:2:68:7:356:236:358:568:1:2368:4:9:8: 45:369: 45:2:39:36:7:1:23:3469:1:348:689:7:2368:368:5:]Play this puzzle online[/url] at the Daily Sudoku site[/url]


I got to this point , Ignored the UR for a long time but used it since I could find no alternative "Hint" gives a 4 in box 7 but I couldn't see it, Neither can I find the XY wing - so I do not feel that I have really solved it since URs are for me - "When all else fails"!!
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re'born



Joined: 28 Oct 2007
Posts: 80

PostPosted: Tue Oct 30, 2007 12:40 am    Post subject: Re: Oct 29 vh Reply with quote

George Woods wrote:

I got to this point , Ignored the UR for a long time but used it since I could find no alternative "Hint" gives a 4 in box 7 but I couldn't see it, Neither can I find the XY wing - so I do not feel that I have really solved it since URs are for me - "When all else fails"!!


Use the naked pair in column 5 to eliminate 8 from r79c5, then look for the xy-wing again.
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