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Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
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 Posted: Tue Jan 29, 2013 10:52 pm Post subject: Jan 30 VH |
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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 |
+-------+----------+----------+
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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: 141
Location: Pembroke, NH
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| Posted: Wed Jan 30, 2013 6:21 am Post subject: Jan 30 VH |
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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: 304
Location: Dorset UK
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| Posted: Wed Jan 30, 2013 1:23 pm Post subject: yet another solution |
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| 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: 1111
Location: Dar es Salaam Tanzania
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| Posted: Wed Jan 30, 2013 5:58 pm Post subject: Jan 30 VH |
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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  |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Jan 30, 2013 6:11 pm Post subject: Re: Jan 30 VH |
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| 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 |
| 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 |
+-------+----------+----------+
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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: 5770
Location: Rochester, NY, USA
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| Posted: Wed Jan 30, 2013 7:23 pm Post subject: |
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| 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: 118
Location: Australia
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| Posted: Thu Jan 31, 2013 10:19 am Post subject: |
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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: 5770
Location: Rochester, NY, USA
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| Posted: Thu Jan 31, 2013 1:37 pm Post subject: |
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| 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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