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Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
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 Posted: Mon Feb 15, 2010 10:31 pm Post subject: Feb 16 VH |
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| UR Type 1 <34> in r14c12 solves the puzzle. |
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kragzy
Joined: 01 May 2007
Posts: 112
Location: Australia
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| Posted: Mon Feb 15, 2010 11:14 pm Post subject: |
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| And there's a good ol' XY wing (679) for those of us who, for no particular reason, prefer to avoid uniqueness solutions. |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Tue Feb 16, 2010 9:39 am Post subject: |
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| a w-wing 67 will also do it. |
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Ema Nymton
Joined: 17 Apr 2009
Posts: 89
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| Posted: Tue Feb 16, 2010 12:30 pm Post subject: |
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| kragzy wrote: | | And there's a good ol' XY wing (679) for those of us who, for no particular reason, prefer to avoid uniqueness solutions. |
| Code: |
+-------------+---------------+-----------------+
| 2348 34 138 | 26 12678 678 | 9 1578 12357 |
| 28 6 5 | 9 1278 3 | 1278 4 127 |
| 9 7 138 | 5 128 4 | 6 18 123 |
+-------------+---------------+-----------------+
| 34 34 79A | 1 79* 2 | 5 6 8 |
| 1 8 67 | 36 4 5 | 37 2 9 |
| 5 2 679B| 8 3679 67C | 137 17 4 |
+-------------+---------------+-----------------+
| 78 9 2 | 4 5 1 | 78 3 6 |
| 368 1 38 | 7 2368 9 | 4 58 25 |
| 3678 5 4 | 236 2368 68 | 1278 9 127 |
+-------------+---------------+-----------------+
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Are you referring to:
r4c3 (A), r4c5 (*), r6c3 (B), r6c6 (C)?
Must the XY Wing (679) removes the common digit '7' from r4c5?
~@:o|
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Ema Nymton
Joined: 17 Apr 2009
Posts: 89
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| Posted: Tue Feb 16, 2010 3:36 pm Post subject: |
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Does r1c9, r2c9, r9c9 constitute a naked triple (127) and thus remove '1' and '2' from r3c9 and '2' from r8c9?
Ema
~@:o|
ps
Maybe I am beginning to get this..... ;-)
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Feb 16, 2010 4:53 pm Post subject: |
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| Quote: | | Does r1c9, r2c9, r9c9 constitute a naked triple (127) and thus remove '1' and '2' from r3c9 and '2' from r8c9? |
Ema, sorry, there's no naked triple there. A naked triple would have to be three cells containing only the same three numbers, but there could be different number combinations. R1c9 has a 35 in it.
For example, a naked triple of 127 could look like:
12-17-27 or
127-27-12 or
17-127-127 |
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Wendy W
Joined: 04 Feb 2008
Posts: 144
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| Posted: Tue Feb 16, 2010 7:44 pm Post subject: |
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| Same as Clement, but I also needed a UR 13 after the UR 34. |
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kragzy
Joined: 01 May 2007
Posts: 112
Location: Australia
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| Posted: Wed Feb 17, 2010 12:00 am Post subject: |
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| Quote: | Are you referring to:
r4c3 (A), r4c5 (*), r6c3 (B), r6c6 (C)?
Must the XY Wing (679) removes the common digit '7' from r4c5?
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Hi Ema,
You're correct but you're not quite there yet. There is an X wing on 7 (cols 6& that will take the 7 out of R6C3. This cell becomes 69 and is the pincer that takes the 7 out of R4C5.
Cheers |
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kragzy
Joined: 01 May 2007
Posts: 112
Location: Australia
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| Posted: Wed Feb 17, 2010 12:04 am Post subject: |
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| That smiley should be '8'. Don't know how that happened; must be the computer, couldn't possibly be my typing skills! |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Feb 17, 2010 12:45 am Post subject: |
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| kragzy wrote: | | That smiley should be '8'. Don't know how that happened; must be the computer, couldn't possibly be my typing skills! |
That happens frequently since some of the smileys are created from a number and a parenthesis. It's easily correctable, and I have to do it frequently. Just edit your post and then below the message box click the box to disable smileys in this particular post. |
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kragzy
Joined: 01 May 2007
Posts: 112
Location: Australia
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| Posted: Wed Feb 17, 2010 1:28 am Post subject: |
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Thanks Marty. The other mistake I made was saying that R6C3 becomes the pincer. It's actually the pivot. Not the computer, not my typing, just a fuzzy brain  (smiley intended!) |
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Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
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| Posted: Wed Feb 17, 2010 7:27 pm Post subject: |
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Wendy,
Yes, there was a UR 13 after the UR 34. However, it was not neccessary to use it, because, once you remove the 34 in r1c1 you get two naked pairs 28 in col 1 and 13 in col 3 which you can use any of them to complete the puzzle. |
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gindaani
Joined: 06 Mar 2009
Posts: 79
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| Posted: Thu Feb 18, 2010 9:02 pm Post subject: |
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I too like to avoid uniqueness based solutions.
The 679 xy-wing is actually two steps, 1) 7 x-wing 2) 679 xy-wing.
The 367 xy-wing is a one stepper that avoids uniqueness tests. |
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