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Jun 15 VH

 
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George Woods



Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK

PostPosted: Fri Jun 15, 2012 9:30 am    Post subject: Jun 15 VH Reply with quote

Code:

After X wing in 5 (cols 1 and 9) and XY in 4 245 pivoted r4c2 and and another probably not needed 467 pivoted r5c6

Code:

+------------+-------------+---------------+
| 9  17  6   | 47  3   2   | 145  145  8   |
| 8  4   3   | 5   9   1   | 7    26   26  |
| 2  17  5   | 467 46  8   |  134 9    34  |
+------------+-------------+---------------+
| 6   25 279 | 3   24  47  | 59   8    1   |
| 45 8   247 | 9   1    67 | 46   3    245 |
| 1  3   249 | 8   246 5   | 469  24   7   |
+------------+-------------+---------------+
| 7  9   8   | 146 5   3   | 2    146  46  |
| 45 6   1   | 2   8   9   | 345  7    345 |
| 3  25  24  | 146 7   46  | 8    1456 9   |
+------------+-------------+---------------+

[url=http://www.dailysudoku.com/sudoku/play.shtml?p=9:17:6:47:3:2:145:145:8:8:4:3:5:9:1:7:26:26:2:17:5:467:46:8: 134:9:34:6: 25:279:3:24:47:59:8:1:45:8:247:9:1: 67:46:3:245:1:3:249:8:246:5:469:24:7:7:9:8:146:5:3:2:146:46:45:6:1:2:8:9:345:7:345:3:25:24:146:7:46:8:1456:9:]Play this puzzle online[/url] at the Daily Sudoku site


finally xyz 245 pivoted at r5c9 solves it
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hughwill



Joined: 05 Apr 2010
Posts: 422
Location: Birmingham UK

PostPosted: Fri Jun 15, 2012 11:12 am    Post subject: Jun 15 VH Reply with quote

In the diagram the 5 in r8c7 can be removed because of the
X wing leaving a type something or other UR on 34 which
sets r8c7 to 3. But even this doesn't seem to set it- it still
needs the XYZ. This was a complicated VH- but I thought it
was strangely unsatisfying...
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

PostPosted: Fri Jun 15, 2012 12:48 pm    Post subject: Reply with quote

Two additional deletions are available in the posted grid due to "locked candidates" conditions: r1c8<>1 & r6c5<>2.

Code:
 *-----------------------------------------------------------*
 | 9     17    6     | 47    3     2     | 145   45    8     |
 | 8     4     3     | 5     9     1     | 7     26    26    |
 | 2     17    5     | 467   46    8     | 134   9     34    |
 |-------------------+-------------------+-------------------|
 | 6    d25    279   | 3    e24   f47    | 59    8     1     |
 | 45    8     247   | 9     1    g67    |h46    3     245   |
 | 1     3     249   | 8     26    5     | 469   24    7     |
 |-------------------+-------------------+-------------------|
 | 7     9     8     | 146   5     3     | 2     146   46    |
 |a45    6     1     | 2     8     9     | 345   7     345   |
 | 3    c25   b24    | 146   7     46    | 8     1456  9     |
 *-----------------------------------------------------------*



The first of these two deletions opens a w-wing(45)r1c8|r8c1 with SL (5)r9c28. However, this does not result in any direct deletions but transporting (4)r8c1, marked a thru h, does the deed.

If r8c1=4, then r9c3=2, then r9c2<>2, then r4c2=2, then r4c5=4, then r4c6=7, then r5c6=6, then r5c7=4. Now the two pincers in r1c8 & r5c7 give r13c7,r6c8<>4 to complete the puzzle.

I do not know if the pincer transport I used is considered a VH move, but hopefully it is acceptable to some folks........

Ted
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Clement



Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania

PostPosted: Fri Jun 15, 2012 3:07 pm    Post subject: Jun 15 VH Reply with quote

Actually the x-wing on 5 in col 19 mentioned by George Woods above solves it. No other moves needed.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Fri Jun 15, 2012 3:33 pm    Post subject: Reply with quote

I used the X-Wing and XYZ-Wing. I've done it twice and needed the 2nd step.
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kent7618



Joined: 15 Jun 2012
Posts: 8

PostPosted: Fri Jun 15, 2012 5:55 pm    Post subject: Re: Jun 15 VH Reply with quote

George Woods wrote:


finally xyz 245 pivoted at r5c9 solves it


I solved it the same way without using XY pivoted at r4c2 .

But I can't deduce that r5c6=7 as the system "Hint" showed.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Fri Jun 15, 2012 6:11 pm    Post subject: Re: Jun 15 VH Reply with quote

kent7618 wrote:
George Woods wrote:


finally xyz 245 pivoted at r5c9 solves it


I solved it the same way without using XY pivoted at r4c2 .

But I can't deduce that r5c6=7 as the system "Hint" showed.


I don't know how the hints work, but after the XYZ-Wing, r5c7=6, so r5c6 has to be 7. Don't know if that makes any sense.
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kent7618



Joined: 15 Jun 2012
Posts: 8

PostPosted: Sat Jun 16, 2012 4:47 pm    Post subject: Re: Jun 15 VH Reply with quote

Marty R. wrote:
kent7618 wrote:
George Woods wrote:


finally xyz 245 pivoted at r5c9 solves it


I solved it the same way without using XY pivoted at r4c2 .

But I can't deduce that r5c6=7 as the system "Hint" showed.


I don't know how the hints work, but after the XYZ-Wing, r5c7=6, so r5c6 has to be 7. Don't know if that makes any sense.


The "Hint" shows r5c6=7 just after the X-Wing (r8c2=6) and before deducing r5c7=6.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Sat Jun 16, 2012 7:04 pm    Post subject: Reply with quote

Quote:
But I can't deduce that r5c6=7 as the system "Hint" showed.


OK, looking at Ted's grid, it's based on the XY-Wing 246 pivoted in r6c8.
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