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Feb 21 VH

 
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roaa



Joined: 18 Apr 2009
Posts: 65
Location: Sweden

PostPosted: Thu Feb 21, 2013 9:29 am    Post subject: Feb 21 VH Reply with quote

An xy-wing 359 solved it for me.
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George Woods



Joined: 28 Mar 2006
Posts: 231
Location: Dorset UK

PostPosted: Thu Feb 21, 2013 12:48 pm    Post subject: w wing solution Reply with quote

Code:

+--------------+-----------------+-------------+
| 57   9    4  | 2     6   78    | 58 17   3   |
| 1    235  27 | 34789 39  34789 | 6  479   58 |
| 37   8    6  | 3479  139 5     | 2  1479 149 |
+--------------+-----------------+-------------+
| 39   23   8  | 5     4   239   | 1  6    7   |
| 349  1234 12 | 6     7   239   | 58 239   58 |
| 6    7    5  | 39    8   1     | 4  239  29  |
+--------------+-----------------+-------------+
| 48   6    9  | 1     23  2348  | 7  5    24  |
| 4578 145  3  | 478   25  2478  | 9  124  6   |
| 2    145  17 | 479   59  6     | 3  8    14  |
+--------------+-----------------+-------------+

[url=http://www.dailysudoku.com/sudoku/play.shtml?p=57:9:4:2:6:78:58:17:3:1:235:27:34789:39:34789:6:479: 58:37:8:6:3479:139:5:2:1479:149:39:23:8:5:4:239:1:6:7:349:1234:12:6:7:239:58:239: 58:6:7:5:39:8:1:4:239:29:48:6:9:1:23:2348:7:5:24:4578:145:3:478:25:2478:9:124:6:2:145:17:479:59:6:3:8:14:]Play this puzzle online[/url] at the Daily Sudoku site

thw w wing 39 in boxes 2 and 5 operating on 9s in col6 leading to r6c4 being 3 solve it
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kuskey



Joined: 10 Dec 2008
Posts: 120
Location: Pembroke, NH

PostPosted: Thu Feb 21, 2013 10:08 pm    Post subject: Feb 21 VH Reply with quote

George Woods:

Some additional basic work will clean things up nicely; a hidden 1 in r1 leads to several cells being solved revealing the 359 xy wing already cited. Some 2s can be culled using box-line reduction although I don't think they are needed. Using your grid I could not find the required strong link on 9 in c6. However, I did find a 39 w wing in c45 using the strong link on 9 in r9, which yields a solution.
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Marty R.



Joined: 12 Feb 2006
Posts: 5065
Location: Rochester, NY, USA

PostPosted: Thu Feb 21, 2013 10:39 pm    Post subject: Reply with quote

Quote:
Using your grid I could not find the required strong link on 9 in c6.


It's there. It's not literally a strong link with only two occurrences, but what some call a grouped strong link. Regardless of which 9 it is in box 5, r6c4 must be 3.
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