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VH jan. 10, 2007

 
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rfv6782



Joined: 22 Jan 2008
Posts: 2
Location: Greenville, SC

PostPosted: Tue Jan 22, 2008 5:16 pm    Post subject: VH jan. 10, 2007 Reply with quote

Im new to this site and am practicing on the VH's.

can someone help with Jan 10 2007

Code:

+----------+-----------+-------------+
| 1  39  7 | 5  2  6   | 34  49  8   |
| 8  23  4 | 13 7  9   | 6   5   123 |
| 6  239 5 | 4  8  13  | 23  19  7   |
+----------+-----------+-------------+
| 4  5   3 | 19 6  2   | 7   8   19  |
| 79 8   1 | 39 45 357 | 234 6   239 |
| 79 6   2 | 8  14  37 | 5   14   39 |
+----------+-----------+-------------+
| 5  4   9 | 2  3  8   | 1   7   6   |
| 2  1   6 | 7  9  4   | 8   3   5   |
| 3  7   8 | 6  15 15  | 9   2   4   |
+----------+-----------+-------------+


now what?
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Marty R.



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

PostPosted: Tue Jan 22, 2008 6:15 pm    Post subject: Reply with quote

Welcome to the forum. There is an XY-Wing pivoted in r5c4. Don't hesitate to ask more questions if needed.
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rfv6782



Joined: 22 Jan 2008
Posts: 2
Location: Greenville, SC

PostPosted: Tue Jan 22, 2008 6:22 pm    Post subject: Reply with quote

(79), (39)pivot ,(73) ?

taking out the 7 in r6c1? is that it....man ...i cant believe i missed it ....i looked so hard.

thanks alot. I just finished a VH from Nov. 07 and solved it with an XY wing. Cant believe i missed this one.
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Asellus



Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA

PostPosted: Wed Jan 23, 2008 3:18 am    Post subject: Reply with quote

Robert,

The {37}r6c6 - {39}r5c4 - {79}r5c1 XY-Wing also removes <7> from r5c6.

It's good to remember to check all of the common peers ("buddies") of the pincers when looking for eliminations. Sometimes it makes a key difference to the result.
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George Woods



Joined: 28 Mar 2006
Posts: 303
Location: Dorset UK

PostPosted: Wed Jan 23, 2008 9:06 am    Post subject: W Wing and XY wing give sameish answer Reply with quote

In the grid given at the start of this thread, there is a solution from an XY wing that removes the 7 from r6c1. The same conclusion (virtually) can be reached via a W-Wing - the 39s in boxes 5 and 6 operating on row 4 deny a 3 to r6c6 and hence deny the 7 to r6c1 (the W wing works thus. Both of 39s cannot be 9 since that would deny a 9 in row 4. Therefore one of them must be 3 and since r6c6 can see both of the 39s it cannot be 3!)
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