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F 28 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Sat Feb 27, 2010 10:49 pm    Post subject: F 28 VH Reply with quote

UR Type 1 (46) in r15c46 taking out 46 in r1c4 solves the puzzle.
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Marty R.



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

PostPosted: Sun Feb 28, 2010 3:08 am    Post subject: Reply with quote

Also the XY-Wing on 584 or 485.
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Wendy W



Joined: 04 Feb 2008
Posts: 144

PostPosted: Mon Mar 01, 2010 12:07 am    Post subject: Reply with quote

xy 458 for me. While watching Team USA lose!
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Mon Mar 01, 2010 3:10 am    Post subject: Reply with quote

Sort of why the USA got to the moon: The USA's German rocket scientists were better than the Soviet's German rocket scientists.

I suppose the Canadians' NHL hockey players are better than the USA's NHL hockey players.

Keith
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mickfarmer



Joined: 16 Feb 2010
Posts: 3

PostPosted: Mon Mar 01, 2010 3:31 pm    Post subject: Reply with quote

Using logic I got down to this position.

Code:

73      8
  9738 64
     537
9 1387 2
827 5 931
36 1928 7
 73869
69 2417 3
1  573


A sweep showed nothing obvious. A hint gave 5 in r1c7. Why?

The site states that only logic is required to solve these puzzles, but I can't see
how they came up with that hint. Can anyone suggest why?

Regards,

Mick
________
[URL=http://www.dodge-wiki.com/wiki/Dodge_Phoenix_(Australia)]DODGE PHOENIX (AUSTRALIA) SPECIFICATIONS[/URL]


Last edited by mickfarmer on Sun Feb 13, 2011 3:53 am; edited 1 time in total
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Marty R.



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

PostPosted: Mon Mar 01, 2010 4:01 pm    Post subject: Reply with quote

This is Mick's grid after an auto-sweep.

Code:

+--------------+-----------+--------------+
| 7   3   2456 | 469 12 46 | 125  159 8   |
| 25  15  9    | 7   3  8  | 125  6   4   |
| 24  148 2468 | 469 12 5  | 3    7   29  |
+--------------+-----------+--------------+
| 9   45  1    | 3   8  7  | 456  2   56  |
| 8   2   7    | 46  5  46 | 9    3   1   |
| 3   6   45   | 1   9  2  | 8    45  7   |
+--------------+-----------+--------------+
| 245 7   3    | 8   6  9  | 1245 145 25  |
| 6   9   58   | 2   4  1  | 7    58  3   |
| 1   48  248  | 5   7  3  | 246  489 269 |
+--------------+-----------+--------------+

Play this puzzle online at the Daily Sudoku site
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

PostPosted: Mon Mar 01, 2010 6:44 pm    Post subject: Reply with quote

Hello mickfarmer, welcome to the forum!

You did all the basic steps that are possible, the grid is right after basics. A "VH" step is needed.

There is an x-wing (5) in rows 6 and 8.
It takes out three candidates: 5 in r1c8, r1c3, r7c8.

The resulting box / line interaction (5 in row 2 confined to cols 1 and 2) removes 5 from r2c7, which then leaves a hidden single 5 in r1c7.
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Marty R.



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

PostPosted: Mon Mar 01, 2010 10:44 pm    Post subject: Reply with quote

Quote:
There is an x-wing (5) in rows 6 and 8.

Interesting. That may be what Sam had in mind, but nobody who posted used it.
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

PostPosted: Tue Mar 02, 2010 6:19 am    Post subject: Reply with quote

Marty R. wrote:
Quote:
There is an x-wing (5) in rows 6 and 8.

Interesting. That may be what Sam had in mind, but nobody who posted used it.


Hm, dunno what Sam had in mind, maybe it's just one of the "vh" moves his program recognizes. I did in fact use that x-wing in solving the puzzle. Some days I start looking for xy wings first, some days I look at individual candidates, a.k.a. "color"ing. Seems I did the Feb 28 vh on a colorful day Smile
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mickfarmer



Joined: 16 Feb 2010
Posts: 3

PostPosted: Tue Mar 02, 2010 1:04 pm    Post subject: Reply with quote

Hi,

A big thank you to those of you who showed me an x wing.

Regards,

Mick
________
Zx14 vs hayabusa


Last edited by mickfarmer on Tue Mar 15, 2011 8:08 pm; edited 1 time in total
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sudocraz



Joined: 28 Apr 2008
Posts: 53

PostPosted: Wed Mar 03, 2010 2:27 am    Post subject: Reply with quote

Wendy W wrote:
xy 458 for me. While watching Team USA lose!


I suppose that is the difference between a Canadian and an American, at least as far as hockey goes. There was no way that I could do a Sudoku while watching that Game! I was so happy when Team Canada won! Very Happy ( I did it later, still so excited that I can't remember how I solved it) Rolling Eyes

Sheila
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