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Jan 30 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 684
Location: Dar es Salaam Tanzania

PostPosted: Tue Jan 29, 2013 10:52 pm    Post subject: Jan 30 VH Reply with quote

Code after Basics
Code:

+-------+----------+----------+
| 6 4 3 | 8   9  1 | 5  7  2  |
| 7 1 5 | 6   2  3 | 8  9  4  |
| 8 9 2 | 4   5  7 | 3  6  1  |
+-------+----------+----------+
| 9 3 7 | 5   1  2 | 6  4  8  |
| 5 6 1 | 37  8  4 | 27 23 9  |
| 4 2 8 | 9   B37 6 | 1  5  C37 |
+-------+----------+----------+
| 1 5 4 | 237 A37 9 | 27 8  6  |
| 3 7 9 | 12  6  8 | 4  12 5  |
| 2 8 6 | 137 4  5 | 9  13 D37 |
+-------+----------+----------+
Remote Pairs 37(ABCD); r9c4<>37 solves it.
Skyscraper on 7 in r59c4; r6c9<>7 does it as well.
Also W-Wing 37 with SL 7 in row 9;r6c5<>3.
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kuskey



Joined: 10 Dec 2008
Posts: 127
Location: Pembroke, NH

PostPosted: Wed Jan 30, 2013 6:21 am    Post subject: Jan 30 VH Reply with quote

Clement:

look at the intersection of r9 with b9-the 3s in b9 make r9c4<>3 opening up a 137 xy wing pivot at r9c4 making r5c8<>3 for the solution.
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George Woods



Joined: 28 Mar 2006
Posts: 234
Location: Dorset UK

PostPosted: Wed Jan 30, 2013 1:23 pm    Post subject: yet another solution Reply with quote

if r7c5 were7 then SL 7 in col 7 mean that a 7 is denied to Box 5
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Clement



Joined: 24 Apr 2006
Posts: 684
Location: Dar es Salaam Tanzania

PostPosted: Wed Jan 30, 2013 5:58 pm    Post subject: Jan 30 VH Reply with quote

kuskey
I agree with you. I didn't comlete the basics. I was just wondering why there is no x, xy or xyz wing as we are used in this forum Exclamation
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Marty R.



Joined: 12 Feb 2006
Posts: 5166
Location: Rochester, NY, USA

PostPosted: Wed Jan 30, 2013 6:11 pm    Post subject: Re: Jan 30 VH Reply with quote

Clement wrote:
kuskey
I agree with you. I didn't comlete the basics. I was just wondering why there is no x, xy or xyz wing as we are used in this forum Exclamation

Code:

+-------+----------+----------+
| 6 4 3 | 8   9  1 | 5  7  2  |
| 7 1 5 | 6   2  3 | 8  9  4  |
| 8 9 2 | 4   5  7 | 3  6  1  |
+-------+----------+----------+
| 9 3 7 | 5   1  2 | 6  4  8  |
| 5 6 1 | 37  8  4 | 27 23 9  |
| 4 2 8 | 9   37 6 | 1  5  37 |
+-------+----------+----------+
| 1 5 4 | 237 37 9 | 27 8  6  |
| 3 7 9 | 12  6  8 | 4  12 5  |
| 2 8 6 | 17  4  5 | 9  13 37 |
+-------+----------+----------+

Play this puzzle online at the Daily Sudoku site

The 3s in r7 are locked in b8; r9c4<>3=>XY-Wing 17-13-37, pivot r9c4.
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Marty R.



Joined: 12 Feb 2006
Posts: 5166
Location: Rochester, NY, USA

PostPosted: Wed Jan 30, 2013 7:23 pm    Post subject: Reply with quote

Oops, I didn't notice that Kuskey had made a similar observation earlier in the thread.
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RobertRattley



Joined: 24 Jun 2007
Posts: 57
Location: Australia

PostPosted: Thu Jan 31, 2013 10:19 am    Post subject: Reply with quote

I also had missed that final "basic" elimination of a 3, and I also had been wondering about the apparent absence of any traditional x, xy or xyz solution.

I'm relieved that dailysudoku hasn't opened up a new era! Will it ever, I wonder?

And (by the way) I was marvelling at how far the basics went. Does this break records? Only 14 cells undecided, and still "very hard"?
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Marty R.



Joined: 12 Feb 2006
Posts: 5166
Location: Rochester, NY, USA

PostPosted: Thu Jan 31, 2013 1:37 pm    Post subject: Reply with quote

Quote:
I'm relieved that dailysudoku hasn't opened up a new era! Will it ever, I wonder?


Probably not in the near term.

Quote:
Only 14 cells undecided, and still "very hard"?


The Easy, Medium ans Hard can be solved with basics. That is an unusually small number of unsolved cells, but it still needed an advanced move, thus the VH rating.
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