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Mar 20 VH

 
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kuskey



Joined: 10 Dec 2008
Posts: 141
Location: Pembroke, NH
PostPosted: Sun Mar 20, 2011 3:18 pm    Post subject: Mar 20 VH Reply with quote
A little tricky-lots of cleanup after basics. All I could find was a 579 XY-Wing pivot r5c9 setting r1c7 and r6c9<>5.
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xgameguy



Joined: 20 Jan 2011
Posts: 3
PostPosted: Mon Mar 21, 2011 5:15 pm    Post subject: Reply with quote
I too found the xy wing, but it didn't solve the puzzle for me. What am I missing? Here's what I have:

+-----------------+------------+---------------+
| 4567 467 5679 | 69 1 8 | 2379 3567 23 |
| 1569 169 8 | 2 3 7 | 4 56 59 |
| 2 3 679 | 469 46 5 | 8 167 179 |
+-------------------+------------+-------------- -+
| 1479 12479 279 | 5 247 6 | 379 1347 8 |
| 479 5 3 | 47 8 1 | 6 2 79 |
| 8 12467 267 | 3 247 9 | 57 147 157 |
+-------------------+------------+----------------+
| 37 8 4 | 1 57 23 | 2357 9 6 |
| 3679 2679 1 | 8 567 4 | 2357 357 23 |
| 3567 267 2567 | 67 9 23 | 1 8 4 |
+-----------------+------------+---------------+
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Julian



Joined: 28 Jul 2010
Posts: 9
Location: Menlo, GA
PostPosted: Mon Mar 21, 2011 7:51 pm    Post subject: Reply with quote
After the xy-579, there is a triple in column 9 that gets rid of the 9 in row 2.
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kuskey



Joined: 10 Dec 2008
Posts: 141
Location: Pembroke, NH
PostPosted: Tue Mar 22, 2011 12:31 am    Post subject: Mar 21 VH Reply with quote
Just in case julian's hint didn't point the way, the intersection of r2 with b1, among other things, sets r13c3<>9, revealing a quad in c3.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue Mar 22, 2011 1:05 am    Post subject: Reply with quote
Julian wrote:
After the xy-579, there is a triple in column 9 that gets rid of the 9 in row 2.

True, but just to state it another way, after the wing removes the 5 from r6c9, there is just one 5 left in column 9.
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