need help

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need help

Postby Drjay » Tue Mar 08, 2016 3:02 pm

Hey guys.

Would appreciate if you can help me with this one. Please tell me which technique to use as well.

Image
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Re: need help

Postby JasonLion » Tue Mar 08, 2016 4:32 pm

8.23...51..3..1...1.4.9.7..937....1224..3..7......23..315.2...742687.1.578951.2..

The next step is a hidden single in block 5. Continue on with singles and locked candidates for a while. Eventually I used a hidden pair and a Finned X-Wing, though there are several other approaches.
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Re: need help

Postby Leren » Tue Mar 08, 2016 7:17 pm

As Jason said r6c5 is the only 7 in box 5 so it must be 7. A few other basic moves will get you to here.

Code: Select all
*-----------------------------------------------------*
| 8    9    2     | 3   b46   7     |a46   5    1     |
| 56   7    3     | 246  58   1     | 9    26-4 48    |
| 1    56   4     | 26   9    58    | 7    236  38    |
|-----------------+-----------------+-----------------|
| 9    3    7     | 46   4568 58    | 8    1    2     |
| 2    4    8     | 1    3    9     | 5-4  7    6     |
| 56   56   1     | 7   c48   2     | 3   d48   9     |
|-----------------+-----------------+-----------------|
| 3    1    5     | 9    2    46    | 468  468  7     |
| 4    2    6     | 8    7    3     | 1    9    5     |
| 7    8    9     | 5    1    46    | 2    346  34    |
*-----------------------------------------------------*

At this point there is a Skyscraper in 4's in cells marked abc and d; at least one of cells a and d must be 4, so r2c8 and r5c7 can't be 4. The puzzle solves easily after that.

If you are unfamiliar with Skyscrapers here is a link to a site that discusses them http://hodoku.sourceforge.net/en/tech_sdp.php#sk

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Re: need help

Postby Yogi » Sat Apr 30, 2016 7:31 am

Hey can you tell me which program you imported this board from, please.
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Re: need help

Postby Leren » Sat Apr 30, 2016 7:57 am

I'm not quite sure what your question means. If you are referring to the PM diagram, I can create a text diagram for any puzzle status using my solver. I then copy and paste the diagram into the reply box, select it and click on the Code button.

This ensures that the PM diagram is displayed in a fixed with font, like Courier, and is easy to read.

Hope this answers your question, Leren
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Re: need help

Postby Yogi » Sun May 01, 2016 12:13 am

I was just wondering which solver program produced the image at the start of this post.
I'm also wondering how the image was imported into the post.

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Re: need help

Postby m_b_metcalf » Sun May 01, 2016 7:47 am

Yogi wrote:II'm also wondering how the image was imported into the post.

If you go to the post and click on 'QUOTE' (upper right), you'll see how it's done.

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Re: need help

Postby Kozo Kataya » Sun May 01, 2016 9:04 am

As i understood what you may note hereunder.
[code
Code: Select all
*-----------------------------*
|         |     4   |  4      |
|         |  4      |    *4  4|
|       4 |         |         |
|---------+---------+---------|
|         |  4  4   | *4      |
|    4    |         |         |
|         |    *4   |     4   |
|---------+---------+---------|
|         |        4|  4 *4   |
|  4      |         |         |
|         |        4|    *4  4|
*-----------------------------*
[/code]
The number with [ * ] cause contradiction, so can be eliminated.
for instance if r6c5=4, row 1 lost 4 > contradiction
r6c5=4 > r1c5<>4, r4c7=4 > r1c7<>4
then after so called [stte]. Regards
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