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VanHegan 5-296105

 
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sun Jun 22, 2014 3:32 am    Post subject: VanHegan 5-296105 Reply with quote
Rated Fiendish 2.2.0.1
Remarkably difficult for this grade, but there is a one-step chain.

Keith

Code:

+-------+-------+-------+
| . . . | 8 3 . | 1 . . |
| . . 3 | . 6 . | . . . |
| 9 . 8 | . 7 1 | 3 2 . |
+-------+-------+-------+
| . . 7 | . . . | . . 3 |
| 6 4 1 | . . . | 2 5 7 |
| 3 . . | . . . | 8 . . |
+-------+-------+-------+
| . 3 2 | 6 4 . | 5 . 1 |
| . . . | . 2 . | 7 . . |
| . . 4 | . 8 5 | . . . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sun Jun 22, 2014 3:33 pm    Post subject: Reply with quote
I despise looking for chains, because for me, it's a total trial-and-error process. I did try to no avail, although there was more I could've tried.

Code:

+----------------+--------------+---------------+
| 247  27    56  | 8    3  249  | 1   4679 4569 |
| 1247 127   3   | 2459 6  249  | 49  4789 4589 |
| 9    56    8   | 45   7  1    | 3   2    456  |
+----------------+--------------+---------------+
| 258  2589  7   | 24   15 246  | 469 1469 3    |
| 6    4     1   | 3    9  8    | 2   5    7    |
| 3    259   59  | 247  15 2467 | 8   1469 469  |
+----------------+--------------+---------------+
| 78   3     2   | 6    4  79   | 5   89   1    |
| 158  15689 569 | 19   2  3    | 7   4689 4689 |
| 17   1679  4   | 179  8  5    | 69  3    2    |
+----------------+--------------+---------------+

Play this puzzle online at the Daily Sudoku site

DP (24), r12,c16

Pseudo cell 17 in r12c1

(17=8)r1297c1-(8=9)r7c8-(9=7)r7c6
9r12c6-(9=7)r7c6=>r7c6=7
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sun Jun 22, 2014 5:31 pm    Post subject: Reply with quote
Marty,
Code:
+-------------------+-------------------+-------------------+
| 247   27    56    | 8     3     249   | 1     4679  4569  |
| 1247  127   3     |A2459  6     249   |D49    4789  4589  |
| 9     56    8     |B45    7     1     | 3     2    C456   |
+-------------------+-------------------+-------------------+
| 258   2589  7     | 24    15    246   | 469   1469  3     |
| 6     4     1     | 3     9     8     | 2     5     7     |
| 3     259   59    | 247   15    2467  | 8     1469  469   |
+-------------------+-------------------+-------------------+
| 78    3     2     | 6     4     79    | 5     89    1     |
| 158   15689 569   | 19    2     3     | 7     4689  4689  |
| 17    1679  4     | 179   8     5     | 69    3     2     |
+-------------------+-------------------+-------------------+

A is not 9. This is not an XY-chain.

A=9, B=5, C=4, D=9. Cannot be.

Keith
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
PostPosted: Sun Jun 22, 2014 10:24 pm    Post subject: Reply with quote
Kite(4R3C7)-(4=2)r4c4
Marty R. wrote:
I despise looking for chains, because for me, it's a total trial-and-error process.
Shocked Question
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sun Jun 22, 2014 11:47 pm    Post subject: Reply with quote
JC Van Hay wrote:
Kite(4R3C7)-(4=2)r4c4
Marty R. wrote:
I despise looking for chains, because for me, it's a total trial-and-error process.
Shocked Question

JC,

Nice find! I stared at this puzzle for two days and did not see that!

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Mon Jun 23, 2014 12:00 am    Post subject: Reply with quote
JC Van Hay wrote:
Kite(4R3C7)-(4=2)r4c4
Marty R. wrote:
I despise looking for chains, because for me, it's a total trial-and-error process.
Shocked Question


JC, what exactly are you asking me?

Nice find on the Kite, which for reasons I don't understand, Danny would say it's not a Kite.

Keith, what did you see to home in on the 9 in r2c4?
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
PostPosted: Mon Jun 23, 2014 8:57 am    Post subject: Reply with quote
keith wrote:
A is not 9. This is not an XY-chain.

A=9, B=5, C=4, D=9. Cannot be.
Code:
]+------------------+-------------------+-------------------+
| 247   27     56  | 8        3   249  | 1     4679  4569  |
| 1247  127    3   | 24-9(5)  6   249  | (49)  4789  4589  |
| 9     56     8   | (45)     7   1    | 3     2     56(4) |
+------------------+-------------------+-------------------+
| 258   2589   7   | 24       15  246  | 469   1469  3     |
| 6     4      1   | 3        9   8    | 2     5     7     |
| 3     259    59  | 247      15  2467 | 8     1469  469   |
+------------------+-------------------+-------------------+
| 78    3      2   | 6        4   79   | 5     89    1     |
| 158   15689  569 | 19       2   3    | 7     4689  4689  |
| 17    1679   4   | 179      8   5    | 69    3     2     |
+------------------+-------------------+-------------------+
Wing : (9=4)r2c7-4r3c6=(4-5)r3c4=5r2c4 :=> -9r2c4


Marty R. wrote:
I despise looking for chains, because for me, it's a total trial-and-error process
Marty, IIRC, you once wrote the same about coloring. So, from your POV : what is left to solve a puzzle ?
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Mon Jun 23, 2014 3:04 pm    Post subject: Reply with quote
Quote:
Marty R. wrote:
I despise looking for chains, because for me, it's a total trial-and-error process
Marty, IIRC, you once wrote the same about coloring. So, from your POV : what is left to solve a puzzle ?


JC, if I said that about coloring I'll take your word for it. As to what's left to solve a puzzle, that's irrelevant. That doesn't alter the statement I made about despising looking for chains because it's a trial-and-error process. I do it because I have to, but that doesn't make it any more likeable or logical.
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Mon Jun 30, 2014 4:16 pm    Post subject: Reply with quote
Quote:
Keith, what did you see to home in on the 9 in r2c4?


I would call it trial and error, in that I was not looking for a pattern. I was doing mental "what if" on the bivalue cells, looking for contradictions.

Keith
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