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July 14 VH

 
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
PostPosted: Tue Jul 14, 2009 1:56 am    Post subject: July 14 VH Reply with quote
Old reliable.

Solution: 248 xy-wing

Early Earl
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crunched



Joined: 05 Feb 2008
Posts: 168
PostPosted: Tue Jul 14, 2009 2:14 am    Post subject: Re: July 14 VH Reply with quote
Earl wrote:
Old reliable.

Solution: 248 xy-wing

Early Earl


Here is grid after basics:

Code:

+------------+--------+----------+
| 9  2   3   | 7  5 4 | 1  6  8  |
| 18 18  5   | 6  2 9 | 7  4  3  |
| 7  4   6   | 3  1 8 | 9  25 25 |
+------------+--------+----------+
| 2  3   14  | 8  6 7 | 45 9  15 |
| 5  9   48  | 24 3 1 | 6  28 7  |
| 6  7   148 | 24 9 5 | 48 3  12 |
+------------+--------+----------+
| 18 158 2   | 9  7 6 | 3  58 4  |
| 4  6   7   | 5  8 3 | 2  1  9  |
| 3  58  9   | 1  4 2 | 58 7  6  |
+------------+--------+----------+

Play this puzzle online at the Daily Sudoku site
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue Jul 14, 2009 3:48 am    Post subject: Reply with quote
I missed the XY-Wing. But I saw three solutions: UR, W-Wing and BUG+2.
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crunched



Joined: 05 Feb 2008
Posts: 168
PostPosted: Tue Jul 14, 2009 4:49 am    Post subject: Reply with quote
Marty R. wrote:
I missed the XY-Wing. But I saw three solutions: UR, W-Wing and BUG+2.


I see the UR, now that you mention it in boxes 1 & 7.
As for the w-wing, is it in the cells marked a-b-c-d? If so, it removes the 8 in r5, c8.
Also, is there not a w-wing using cells marked e-f-g-h, removing the 8 in r7, c2?


Code:

+------------+--------+----------+
| 9  2   3   | 7  5 4 | 1  6  8  |
| 18 18  5   | 6  2 9 | 7  4  3  |
| 7  4   6   | 3  1 8 | 9  25 25 |
+------------+--------+----------+
| 2  3   14  | 8  6 7 | 45 9  15 |
| 5  9  a48  |b24 3 1 | 6  28 7  |
| 6  7   148 |c24 9 5 | d48 3 12 |
+------------+--------+----------+
|h18 158  2  | 9  7 6 | 3 e58 4  |
| 4   6   7  | 5  8 3 | 2  1  9  |
| 3 g58   9  | 1  4 2 |f58 7  6  |
+------------+--------+----------+

Play this puzzle online at the Daily Sudoku site
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue Jul 14, 2009 5:05 am    Post subject: Reply with quote
crunched wrote:
Marty R. wrote:
I missed the XY-Wing. But I saw three solutions: UR, W-Wing and BUG+2.


I see the UR, now that you mention it in boxes 1 & 7.
As for the w-wing, is it in the cells marked a-b-c-d? If so, it removes the 8 in r5, c8.
Also, is there not a w-wing using cells marked e-f-g-h, removing the 8 in r7, c2?


Code:

+------------+--------+----------+
| 9  2   3   | 7  5 4 | 1  6  8  |
| 18 18  5   | 6  2 9 | 7  4  3  |
| 7  4   6   | 3  1 8 | 9  25 25 |
+------------+--------+----------+
| 2  3   14  | 8  6 7 | 45 9  15 |
| 5  9  a48  |b24 3 1 | 6  28 7  |
| 6  7   148 |c24 9 5 | d48 3 12 |
+------------+--------+----------+
|h18 158  2  | 9  7 6 | 3 e58 4  |
| 4   6   7  | 5  8 3 | 2  1  9  |
| 3 g58   9  | 1  4 2 |f58 7  6  |
+------------+--------+----------+

Play this puzzle online at the Daily Sudoku site

My W-Wing was on the 48s in boxes 46, connected by the 4s in r4 and taking out 8s in r6c3 and r5c8.

I'm sorry, I can't see a W-Wing on the 58s.
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Tue Jul 14, 2009 12:44 pm    Post subject: Reply with quote
For something different there is a:
Quote:
Bug+2 than says r5c8<>8
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gindaani



Joined: 06 Mar 2009
Posts: 79
PostPosted: Tue Jul 14, 2009 3:56 pm    Post subject: Reply with quote
arkietech wrote:
For something different there is a:
Quote:
Bug+2 than says r5c8<>8


I do not see how the Bug+2 can eliminate 8 from r5c8. If I understand Bugs correctly, the Bug+2 says that r6c3=4 or r7c2=8. From that you can determine that r7c1<>8 (which leads nowhere) or r6c4<>4. You can get to r5c8<>8 from r6c4<>4, but I do not see how you can eliminate 8 directly from the Bug. What am I missing?
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Tue Jul 14, 2009 7:04 pm    Post subject: Reply with quote
Embarassed
gandaani,
Code:
 *--------------------------------------------------*
 | 9    2    3    | 7    5    4    | 1    6    8    |
 | 18   18   5    | 6    2    9    | 7    4    3    |
 | 7    4    6    | 3    1    8    | 9    25   25   |
 |----------------+----------------+----------------|
 | 2    3    14   | 8    6    7    | 45   9    15   |
 | 5    9    48   | 24   3    1    | 6    28   7    |
 | 6    7   *148  | 24   9    5    | 48   3    12   |
 |----------------+----------------+----------------|
 | 18  *158  2    | 9    7    6    | 3    58   4    |
 | 4    6    7    | 5    8    3    | 2    1    9    |
 | 3    58   9    | 1    4    2    | 58   7    6    |
 *--------------------------------------------------*
you are right I got my 5's and 8's mixed up on r7c2.

Back to the drawing board.

Try r2c1 must equal 8 -- with it you still need and xy-wing
I will keep trying. Thanks for keeping me straight.
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada
PostPosted: Tue Jul 14, 2009 7:41 pm    Post subject: Reply with quote
Why look for Bug+2s when there is a pathetically easy Type 1 UR. For a very hard this was very limp.
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Tue Jul 14, 2009 11:11 pm    Post subject: Reply with quote
cgordon wrote:
Why look for Bug+2s when there is a pathetically easy Type 1 UR. For a very hard this was very limp.

Trying to bring up the limp level. Smile
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