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Jul 18 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
PostPosted: Sat Jul 17, 2010 11:51 pm    Post subject: Jul 18 VH Reply with quote
A kite in 5 originating in BOX 8 eliminates 5 in r6c8; followed by :
XY-Wing 18 58 15 Pivoted in BOX 8 removing 1 in r2c9 solves it.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sun Jul 18, 2010 1:05 am    Post subject: Reply with quote
I used an XY-Wing (351) with transport of each pincer.
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zx



Joined: 21 Apr 2008
Posts: 6
PostPosted: Sun Jul 18, 2010 11:03 pm    Post subject: Reply with quote
Code:

+---------+------------+-----------+
| 89 3  7 | 2   6   18 | 5 19  4   |
| 89 6  2 | 4   18  5  | 3 7   19  |
| 5  4  1 | 7   3   9  | 8 6   2   |
+---------+------------+-----------+
| 6  59 8 | 35  4   7  | 1 2   359 |
| 1  59 3 | 8   2   6  | 4 59  7   |
| 7  2  4 | 9   15  13 | 6 58  358 |
+---------+------------+-----------+
| 3  18 9 | 15  7   4  | 2 158 6   |
| 4  18 5 | 6   9   2  | 7 3   18  |
| 2  7  6 | 135 158 38 | 9 4   15  |
+---------+------------+-----------+


I'm a little stuck here. Trying to break this open with just wings... it should be possible, shouldn't it? Am I not seeing something?
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sun Jul 18, 2010 11:15 pm    Post subject: Reply with quote
Quote:
I'm a little stuck here. Trying to break this open with just wings... it should be possible, shouldn't it? Am I not seeing something?

Yes, it should be possible to solve this with wings only, but all three of us have failed to see it. As for myself, I did not check thoroughly for X-Wings, so who knows, maybe there's something there.
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Mon Jul 19, 2010 12:28 am    Post subject: Reply with quote
zx: The 1 in B8 must be in C4. R9C5 is not 1.

After basics:
Code:
+-------------+-------------+-------------+
| 89  3   7   | 2   6   18  | 5   19  4   |
| 89  6   2   | 4   18  5   | 3   7   19  |
| 5   4   1   | 7   3   9   | 8   6   2   |
+-------------+-------------+-------------+
| 6   59  8   | 35  4   7   | 1   2   359 |
| 1   59  3   | 8   2   6   | 4   59  7   |
| 7   2   4   | 9   15  13  | 6   58  358 |
+-------------+-------------+-------------+
| 3   18  9   | 15  7   4   | 2   158 6   |
| 4   18  5   | 6   9   2   | 7   3   18  |
| 2   7   6   | 135 58  38  | 9   4   15  |
+-------------+-------------+-------------+
(you have to work on R9C9.)

An XY-wing -158 solves it.

Keith
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zx



Joined: 21 Apr 2008
Posts: 6
PostPosted: Mon Jul 19, 2010 1:15 am    Post subject: Reply with quote
thanks keith... been making that mistake a lot recently. wings are a lot easier to find once boxes are properly swept.
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kuskey



Joined: 10 Dec 2008
Posts: 141
Location: Pembroke, NH
PostPosted: Mon Jul 19, 2010 1:32 am    Post subject: Reply with quote
First try yielded an xy-wing (135), got stuck, got tired, and put it away for the night. Next morning 3 quick xy-wings (189,135,and 158) solved it.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Mon Jul 19, 2010 3:39 am    Post subject: Reply with quote
Welcome to the forum, kuskey. That seems to happen frequently with both Sudoku and crosswords, put them away and have some success the second time.
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada
PostPosted: Mon Jul 19, 2010 3:00 pm    Post subject: Reply with quote
The 158 xy wing can also be preceded by an ER for 5 (using C5, Box 9) which makes the same R6C8 elimination as Clement's kite. Maybe kite's and ER's are related.
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Wendy W



Joined: 04 Feb 2008
Posts: 144
PostPosted: Mon Jul 19, 2010 11:34 pm    Post subject: Reply with quote
@Marty, isn't that the truth! Inevitably, as soon as I pick it up the next time I spot a missed wing or pair.
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kragzy



Joined: 01 May 2007
Posts: 112
Location: Australia
PostPosted: Tue Jul 20, 2010 2:27 am    Post subject: Reply with quote
I just did this puzzle (a little late) and went to the forum expecting to see complaints about how easy it was.

Looking at Keith's 'after basics' grid, there is a one step 158 XY wing pivoted on r9c5 that solves the puzzle in a flash.
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