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prakash
Joined: 02 Jan 2008
Posts: 67
Location: New Jersey, USA
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 Posted: Mon Nov 29, 2010 3:13 am Post subject: Nov 29 vh |
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| Needed an X wing on 3 to get to a XYZ wing (129). Checking other possibilities... |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Nov 29, 2010 4:24 am Post subject: |
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I had more trouble with this one than any I can remember. First time it was five steps, second time seven steps.  |
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kuskey
Joined: 10 Dec 2008
Posts: 141
Location: Pembroke, NH
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| Posted: Mon Nov 29, 2010 5:13 am Post subject: Nov 29 VH |
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| Got the x-wing on 3 followed by a type 1 UR on 48 in b47 for a 2-stepper. |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Mon Nov 29, 2010 4:29 pm Post subject: |
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| Quote: | | I had more trouble with this one than any I can remember. First time it was five steps, second time seven steps. |
Glad you said this! I had wings and things - URs and ERs coming out of my ears.  |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Nov 29, 2010 8:37 pm Post subject: Re: Nov 29 VH |
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| kuskey wrote: | | Got the x-wing on 3 followed by a type 1 UR on 48 in b47 for a 2-stepper. |
I need help replicating the above. Here's my grid after basics and two X-Wings (3) and I can't make that UR turn into a Type 1.
| Code: |
+--------------+------------+------------+
| 1289 3 18 | 89 7 5 | 4 129 6 |
| 1489 489 5 | 2 6 348 | 37 179 19 |
| 249 7 6 | 349 49 1 | 5 8 239 |
+--------------+------------+------------+
| 49 1 2 | 6 8 37 | 37 5 349 |
| 6 5 3 | 1 49 47 | 2 79 8 |
| 7 489 48 | 39 5 2 | 1 6 349 |
+--------------+------------+------------+
| 3 2 9 | 7 1 6 | 8 4 5 |
| 148 48 148 | 5 2 9 | 6 3 7 |
| 5 6 7 | 48 3 48 | 9 12 12 |
+--------------+------------+------------+
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Play this puzzle online at the Daily Sudoku site
(Edited to correct basics.)
Last edited by Marty R. on Mon Nov 29, 2010 10:11 pm; edited 3 times in total |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Mon Nov 29, 2010 8:51 pm Post subject: |
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| Quote: | | .....and I can't make that UR turn into a Type 1. |
I see that as a Type 6 UR that gets rid of the 4 in R6C2 - which doesn't really help (at least not immediately). |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Mon Nov 29, 2010 9:19 pm Post subject: |
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I had three moves...
| Code: | x-wing(3)
xy-wing(89-4) r1c4 ; r3c4<>4
xy-wing(29-1) r1c8 ; r2c8<>1 |
I couldn't make the UR or the xyz-wing (at least two of them) solve it - but I was rushing... |
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Kdelle
Joined: 20 Mar 2008
Posts: 59
Location: Hudson, NH
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| Posted: Mon Nov 29, 2010 9:33 pm Post subject: Re: Nov 29 VH |
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| Marty R. wrote: | | kuskey wrote: | | Got the x-wing on 3 followed by a type 1 UR on 48 in b47 for a 2-stepper. |
I need help replicating the above. Here's my grid after basics and two X-Wings (3) and I can't make that UR turn into a Type 1.
| Code: |
+--------------+------------+------------+
| 1289 3 18 | 89 7 5 | 4 129 6 |
| 1489 489 5 | 2 6 348 | 37 179 19 |
| 249 7 6 | 349 49 1 | 5 8 239 |
+--------------+------------+------------+
| 479 1 2 | 6 8 347 | 37 5 349 |
| 6 5 3 | 1 49 47 | 2 79 8 |
| 4789 489 48 | 349 5 2 | 1 6 349 |
+--------------+------------+------------+
| 3 2 9 | 7 1 6 | 8 4 5 |
| 148 48 148 | 5 2 9 | 6 3 7 |
| 5 6 7 | 48 3 48 | 9 12 12 |
+--------------+------------+------------+
|
Play this puzzle online at the Daily Sudoku site |
Marty,
I think there are a few more basics. Look at row 6.
Not sure that helps too much, though, in terms of the UR.
Kathy |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Mon Nov 29, 2010 9:38 pm Post subject: |
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After basics: | Code: | +----------------+----------------+----------------+
| 1289 389 18 | 389 7 5 | 4 1239 6 |
| 1489 3489 5 | 2 6 348 | 37 1379 1379 |
| 249 7 6 | 349 49 1 | 5 8 239 |
+----------------+----------------+----------------+
| 49 1 2 | 6 8 37 | 37 5 49 |
| 6 5 3 | 1 49 47 | 2 79 8 |
| 7 489 48 | 39 5 2 | 1 6 349 |
+----------------+----------------+----------------+
| 3 2 9 | 7 1 6 | 8 4 5 |
| 148 48 148 | 5 2 9 | 6 37 37 |
| 5 6 7 | 48 3 48 | 9 12 12 |
+----------------+----------------+----------------+ |
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Nov 29, 2010 10:06 pm Post subject: |
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| Quote: | Marty,
I think there are a few more basics. Look at row 6. |
Heh heh, that seems to be the rule rather than the exception.
Thanks. |
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kuskey
Joined: 10 Dec 2008
Posts: 141
Location: Pembroke, NH
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| Posted: Tue Nov 30, 2010 1:49 am Post subject: Nov 29 VH |
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| A second bite at the apple, I think. This turned out to be, for me at least, a tricky little puzzle both during and after basics. After a couple of passes through the basic tools I arrived at a grid that was in agreement with Keith. The UR on 48 stood unresolved at this point. The x-wing on 3 led to a 489 xy-wing with pivot at r1c4 eliminating 4 at r3c4. After more churning, up popped the type 1 UR on 48 in c23 placing 9 in r6c2 solving the puzzle in 3 steps. |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Tue Nov 30, 2010 9:19 am Post subject: |
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The Type 6 UR(48) does hold the key to a two-step solution by creating a simple pincer move...
| Code: |
After the x-wing(3)...
*-----------------------------------------------------------*
| 1289 3 (18) | (89) 7 5 | 4 129 6 |
| 1489 489 5 | 2 6 348 | 37 179 19 |
| 249 7 6 | 349 49 1 | 5 8 239 |
|-------------------+-------------------+-------------------|
| 49 1 2 | 6 8 37 | 37 5 49 |
| 6 5 3 | 1 49 47 | 2 79 8 |
| 7 *48+9 *48 | 3-9 5 2 | 1 6 349 |
|-------------------+-------------------+-------------------|
| 3 2 9 | 7 1 6 | 8 4 5 |
| 148 *48 *48+1 | 5 2 9 | 6 3 7 |
| 5 6 7 | 48 3 48 | 9 12 12 |
*-----------------------------------------------------------*
UR(48)r68c23[(9)r6c2=(1)r8c3] - (1=8)r1c3 - (8=9)r1c4 ; r6c4<>9
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To avoid the DP, r6c2=9 or ...
r8c2=1 and so r1c3=8 and r1c4=9 - hence in both cases r6c4<>9
(FWIW With some kludgy "almost" logic you can use a fin (3)r1c4 and the strong links of the x-wing to make the same elimination after basics for a one-stepper.) |
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