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May 4 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Tue May 03, 2011 10:09 pm    Post subject: May 4 VH Reply with quote
XY-Wing 69 36 39 pivoted in r2c1 eliminates 9 in r4c4 solving it.
The Type 1 UR 15 solves the puzzle as well.
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada
PostPosted: Wed May 04, 2011 2:54 pm    Post subject: Reply with quote
I thought it was a Type 4 UR on 15.

Last edited by cgordon on Wed May 04, 2011 4:08 pm; edited 1 time in total
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed May 04, 2011 3:53 pm    Post subject: Reply with quote
cgordon wrote:
I thought it was a Type 4 UR on 15.

Anyway - the toughest part was was solving R7C1.

R7c1 was a given. This was my post-basics grid. I also had the UR as a Type 1.

Code:

+----------+---------+------------+
| 8   1  2 | 7  5 69 | 4  3  69   |
| 36  4  7 | 39 8 2  | 59 15 1569 |
| 356 56 9 | 34 1 46 | 2  7  8    |
+----------+---------+------------+
| 69  8  3 | 49 2 5  | 1  46 7    |
| 29  7  4 | 1  6 3  | 59 8  259  |
| 1   26 5 | 8  7 49 | 3  46 29   |
+----------+---------+------------+
| 4   3  6 | 2  9 7  | 8  15 15   |
| 7   9  1 | 5  3 8  | 6  2  4    |
| 25  25 8 | 6  4 1  | 7  9  3    |
+----------+---------+------------+

Play this puzzle online at the Daily Sudoku site
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada
PostPosted: Wed May 04, 2011 4:08 pm    Post subject: Reply with quote
Quote:
R7c1 was a given.

Yes - I wasn't thinking straight. Don't remember seeing many singles in a row.
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Wed May 04, 2011 10:00 pm    Post subject: Reply with quote
We should not forget the W-Wing 46 with strong link 6 in col 2.
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