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April 18 VH

 
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS

PostPosted: Sat Apr 18, 2009 1:52 am    Post subject: April 18 VH Reply with quote

Two obvious single-step solutions. Take your pick.

Solutions: UR 48 or UR 29


Early Earl
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

PostPosted: Sat Apr 18, 2009 2:19 am    Post subject: Reply with quote

A less obvious one stepper is
Quote:
a Kraken x-wing <9>.

Ted
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Marty R.



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

PostPosted: Sat Apr 18, 2009 4:16 am    Post subject: Reply with quote

I tried a non-UR solution. An X-Wing on 4 set up a puzzle-ending W-Wing on 89.
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Clement



Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania

PostPosted: Sat Apr 18, 2009 6:58 am    Post subject: Daily Sudoku: Sat 18-Apr-2009 VH Reply with quote

A UR<48> solves the puzzle.
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Sat Apr 18, 2009 12:05 pm    Post subject: Reply with quote

This should be saved for VH Sudokus 101. There are two Type 1 UR's, x-wings on 4, colouring on 8, an ER on 9 and a Skyscraper on 9.
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gindaani



Joined: 06 Mar 2009
Posts: 79

PostPosted: Sat Apr 18, 2009 5:47 pm    Post subject: Reply with quote

All I needed was a 498 xy-wing to solve this one.
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Sat Apr 18, 2009 10:38 pm    Post subject: Reply with quote

hmm
my BUG+2 reasoning wasn't correct.


Last edited by storm_norm on Sun Apr 19, 2009 1:43 am; edited 1 time in total
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daj95376



Joined: 23 Aug 2008
Posts: 3854

PostPosted: Sun Apr 19, 2009 1:34 am    Post subject: Reply with quote

[Withdrawn]

Last edited by daj95376 on Sun Apr 19, 2009 1:52 am; edited 2 times in total
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Sun Apr 19, 2009 1:45 am    Post subject: Reply with quote

daj95376 wrote:
Norm: There are four cells with three candidates. I don't think you can do a BUG+2 here.

Code:
 +-----------------------------------------------------+
 |  2    68   7    |  5    1    46   |  48   9    3    |
 |  4    69   3    |  29   8    26+9 |  7    1    5    |
 |  1    5    89   |  3    49   7    |  2    6    48   |
 |-----------------+-----------------+-----------------|
 |  35   4    59   |  8    2    39   |  6    7    1    |
 |  7    1    2    |  6    49   5    |  89+4 3    48   |
 |  38   89   6    |  1    7    34+9 |  49   5    2    |
 |-----------------+-----------------+-----------------|
 |  9    7    1    |  4    3    8    |  5    2    6    |
 |  58   3    45+8 |  29   6    29   |  1    48   7    |
 |  6    2    48   |  7    5    1    |  3    48   9    |
 +-----------------------------------------------------+
 # 30 eliminations remain


is it just me, or do you gun for me the most?
if you love me, just say it.
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daj95376



Joined: 23 Aug 2008
Posts: 3854

PostPosted: Sun Apr 19, 2009 1:50 am    Post subject: Reply with quote

storm_norm wrote:
is it just me, or do you gun for me the most?
if you love me, just say it.

I'm not gunning for you, but I do promise not to comment further on your posts.
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Sun Apr 19, 2009 2:02 am    Post subject: Reply with quote

daj95376 wrote:
storm_norm wrote:
is it just me, or do you gun for me the most?
if you love me, just say it.

I'm not gunning for you, but I do promise not to comment further on your posts.

oh boy.
it was a joke, Danny.
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swando



Joined: 09 Mar 2009
Posts: 17
Location: Surrey, BC. Canada

PostPosted: Sun Apr 19, 2009 8:39 am    Post subject: Reply with quote

I found this one very tricky...I can spot and solve x wings, xy's and xyz but I don't know what you call the 29,29,29, 296. I figured it out but not sure what it is called.
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Marty R.



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

PostPosted: Sun Apr 19, 2009 3:30 pm    Post subject: Reply with quote

Swando,

It's called a Type 1 Unique Rectangle (UR). You can read more about URs here:

http://www.sudoku.com/boards/viewtopic.php?p=29105#29105

Code:

+------------+-----------+-----------+
| 2  68  7   | 5  1  46  | 48  9  3  |
| 4  69  3   | 29 8  269 | 7   1  5  |
| 1  589 589 | 3  49 7   | 2   6  48 |
+------------+-----------+-----------+
| 35 4   59  | 8  2  39  | 6   7  1  |
| 7  1   2   | 6  49 5   | 489 3  48 |
| 38 89  6   | 1  7  349 | 49  5  2  |
+------------+-----------+-----------+
| 9  7   1   | 4  3  8   | 5   2  6  |
| 58 3   458 | 29 6  29  | 1   48 7  |
| 6  2   48  | 7  5  1   | 3   48 9  |
+------------+-----------+-----------+

Play this puzzle online at the Daily Sudoku site
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