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George Woods
Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
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 Posted: Fri Jun 15, 2012 9:30 am Post subject: Jun 15 VH |
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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 |
+------------+-------------+---------------+
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[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: 424
Location: Birmingham UK
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| Posted: Fri Jun 15, 2012 11:12 am Post subject: Jun 15 VH |
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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
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| Posted: Fri Jun 15, 2012 12:48 pm Post subject: |
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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: 1113
Location: Dar es Salaam Tanzania
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| Posted: Fri Jun 15, 2012 3:07 pm Post subject: Jun 15 VH |
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| 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
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| Posted: Fri Jun 15, 2012 3:33 pm Post subject: |
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| 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
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| Posted: Fri Jun 15, 2012 5:55 pm Post subject: Re: Jun 15 VH |
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| 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
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| Posted: Fri Jun 15, 2012 6:11 pm Post subject: Re: Jun 15 VH |
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| 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
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| Posted: Sat Jun 16, 2012 4:47 pm Post subject: Re: Jun 15 VH |
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| 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
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| Posted: Sat Jun 16, 2012 7:04 pm Post subject: |
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| 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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