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Not a Very Hard puzzle - strictly process of elimination.

 
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richfa



Joined: 14 Feb 2016
Posts: 12

PostPosted: Sun Feb 14, 2016 4:07 pm    Post subject: Not a Very Hard puzzle - strictly process of elimination. Reply with quote

If you want, at minimum, I suppose you could call it medium difficulty.
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dongrave



Joined: 06 Mar 2014
Posts: 332

PostPosted: Sun Feb 14, 2016 4:15 pm    Post subject: Reply with quote

What puzzle are you referring to, richfa? You don't mean today's VH, do you? If so, you might want to do it again because I had to use the same 3 VH moves that Hugh did (and that was only because I ignored 2 additional VH moves that turned out to not be necessary).
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pbreinhart



Joined: 21 Sep 2007
Posts: 9
Location: Atlanta, GA

PostPosted: Sun Feb 14, 2016 7:24 pm    Post subject: Reply with quote

How does one get th 4 in the lower left square of Feb 4 puzzle?
Thanks.
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pbreinhart



Joined: 21 Sep 2007
Posts: 9
Location: Atlanta, GA

PostPosted: Sun Feb 14, 2016 7:26 pm    Post subject: Reply with quote

I forget to include the puzzle:

Code:

+--------------+-----------+-------------+
| 9    12  7   | 8   6  3  | 4   5   12  |
| 23   4   8   | 1   5  7  | 6   29  239 |
| 35   135 6   | 9   4  2  | 38  7   138 |
+--------------+-----------+-------------+
| 2345 235 1   | 245 78 9  | 78  24  6   |
| 8    7   249 | 24  1  6  | 29  3   5   |
| 6    25  249 | 3   78 45 | 1   249 78  |
+--------------+-----------+-------------+
| 1    8   24  | 457 3  45 | 279 6   279 |
| 4    6   5   | 47  9  1  | 237 8   237 |
| 7    9   3   | 6   2  8  | 5   1   4   |
+--------------+-----------+-------------+

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: Sun Feb 14, 2016 8:11 pm    Post subject: Reply with quote

pbreinhart wrote:
How does one get th 4 in the lower left square of Feb 4 puzzle?
Thanks.


Code:
+--------------+-----------+-------------+
| 9    12  7   | 8   6  3  | 4   5   12  |
| 23   4   8   | 1   5  7  | 6   29  239 |
| 35   135 6   | 9   4  2  | 38  7   138 |
+--------------+-----------+-------------+
| 2345 235 1   | 245 78 9  | 78  24  6   |
| 8    7   249 | 24  1  6  | 29  3   5   |
| 6    25  249 | 3   78 45 | 1   249 78  |
+--------------+-----------+-------------+
| 1    8   24  | 457 3  45 | 279 6   279 |
| 4    6   5   | 47  9  1  | 237 8   237 |
| 7    9   3   | 6   2  8  | 5   1   4   |
+--------------+-----------+-------------+

[code]
+-------+-------+-------+
| . . 4 | 7 3 . | . . . |
| 5 3 . | . 1 . | . . 6 |
| . . 6 | 9 . . | . 2 . |
+-------+-------+-------+
| 8 . 1 | . . . | . 5 . |
| 4 . . | . . . | . . 1 |
| . 6 . | . . . | 7 . 8 |
+-------+-------+-------+
| . 1 . | . . 5 | 8 . . |
| 7 . . | . 6 . | . 1 2 |
| . . . | . 2 3 | 5 . . |
+-------+-------+-------+
[/code]
[url=http://www.dailysudoku.com/sudoku/play.shtml?p=0:0:4:7:3:0:0:0:0:5:3:0:0:1:0:0:0:6:0:0:6:9:0:0:0:2:0:8:0:1:0:0:0:0:5:0:4:0:0:0:0:0:0:0:1:0:6:0:0:0:0:7:0:8:0:1:0:0:0:5:8:0:0:7:0:0:0:6:0:0:1:2:0:0:0:0:2:3:5:0:0:]Play this puzzle online[/url] at the Daily Sudoku site

Above is the opening grid of the Feb 4, rated H. So it appears that you're asking about a different puzzle.
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dongrave



Joined: 06 Mar 2014
Posts: 332

PostPosted: Sun Feb 14, 2016 8:33 pm    Post subject: Reply with quote

pbreinhart wrote:
How does one get th 4 in the lower left square of Feb 4 puzzle?
Thanks.

Hi pbreinhart, Your grid looks exactly like the one that Hugh posted after basics except that you have r8c1=4 instead of 2,4. Are you using some on-line method or computer program that's telling you that that move is a hint or something? If so, you can't determine it from basic methods; only from more advanced moves like a chain. For instance, one simple method could be for you to prove by contradiction that if you assumed it's not 4, then it must be 4 as follows (if r8c1<>4 then r7c3=4 so r5c3<>4 so r5c4=4 so r8c4<>4 so r8c1=4). This tells you that r8c1 must be 4 and if you were able to solve the rest of the puzzle using just basics, then this would be a great solution (because you did it only using one advanced step). However, this doesn't solve it - so it's not a great solution and certainly not (as Marty refers to as) the 'path of least resistance'. If you ignore whatever is giving you this 'hint', the next straightforward move (especially considering that all VHs on this site can be solved using only basics, X wings, XY wings, and XYZ wings) would be Hugh's 45-2 XY Wing w/ pivot at r6c6 allowing you to continue with eliminations other than r8c1.
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dongrave



Joined: 06 Mar 2014
Posts: 332

PostPosted: Sun Feb 14, 2016 8:36 pm    Post subject: Reply with quote

Marty R. wrote:
pbreinhart wrote:
How does one get th 4 in the lower left square of Feb 4 puzzle?
Thanks.

...

Above is the opening grid of the Feb 4, rated H. So it appears that you're asking about a different puzzle.

Hi Marty! Yes, I noticed that! He actually meant Feb 14th. Don.
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pbreinhart



Joined: 21 Sep 2007
Posts: 9
Location: Atlanta, GA

PostPosted: Sun Feb 14, 2016 9:40 pm    Post subject: Reply with quote

Thank you very much for your info. It is true, I miss typed. The puzzle is from Feb 14 not Feb 4. And, I got the idea for the 4 from a hint. Nevertheless, I will try your suggestion and thanks again.
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