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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Wed Nov 26, 2008 3:05 am Post subject: Nov 26 VH |
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I needed two xy-wings. Anyone find a single-step solution?
Earl |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Wed Nov 26, 2008 7:32 am Post subject: |
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| I found an xyz-wing that cracked it |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Wed Nov 26, 2008 7:32 am Post subject: |
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| After basics, coloring didn't turn up anything really useful (one measly r5c6<>7), but then I found an xyz-wing (67-678-78 col 9, box 6; r6c9<>7) that solved the puzzle. |
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crunched
Joined: 05 Feb 2008
Posts: 168
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| Posted: Wed Nov 26, 2008 7:48 am Post subject: Re: Nov 26 VH |
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| Earl wrote: | I needed two xy-wings. Anyone find a single-step solution?
Earl |
Here is the grid after basics.
6-7-9 is the 1st xy-wing. It removes all the 7s in c6 in box 5
4-6-7 is the other xy-wing opened up from the first xy-wing.
Where is the x-y-z wing in box 6?
| Code: |
+-----------+--------------+----------------+
| 5 4 3 | 2 8 67 | 1 9 67 |
| 2 16 9 | 5 347 1367 | 46 3478 34678 |
| 7 8 16 | 69 34 169 | 2 34 5 |
+-----------+--------------+----------------+
| 3 567 4 | 79 1 5789 | 56 2 678 |
| 1 567 568 | 347 2 3578 | 456 478 9 |
| 9 2 58 | 47 6 578 | 3 1 478 |
+-----------+--------------+----------------+
| 4 9 2 | 367 37 367 | 8 5 1 |
| 6 15 15 | 8 9 2 | 7 34 34 |
| 8 3 7 | 1 5 4 | 9 6 2 |
+-----------+--------------+----------------+
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Play this puzzle online at the Daily Sudoku site |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Wed Nov 26, 2008 8:18 am Post subject: |
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| xyz in col 8 and 9 |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Wed Nov 26, 2008 8:39 am Post subject: |
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| crunched, you missed a naked pair 34 in col 8 |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Wed Nov 26, 2008 12:00 pm Post subject: Re: Nov 26 VH |
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| crunched wrote: | Where is the x-y-z wing in box 6?
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Here is the xyz I found after basics | Code: | *--------------------------------------------------------------------*
| 5 4 3 | 2 8 67 | 1 9 *67 |
| 2 16 9 | 5 347 1367 | 46 78 34678 |
| 7 8 16 | 69 34 169 | 2 34 5 |
|----------------------+----------------------+----------------------|
| 3 567 4 | 79 1 5789 | 56 2 *678 |
| 1 567 568 | 347 2 3578 | 456 *78 9 |
| 9 2 58 | 47 6 578 | 3 1 48-7 |
|----------------------+----------------------+----------------------|
| 4 9 2 | 367 37 367 | 8 5 1 |
| 6 15 15 | 8 9 2 | 7 34 34 |
| 8 3 7 | 1 5 4 | 9 6 2 |
*--------------------------------------------------------------------*
xyz-wing(678) |
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crunched
Joined: 05 Feb 2008
Posts: 168
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| Posted: Wed Nov 26, 2008 2:23 pm Post subject: |
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| nataraj wrote: | | crunched, you missed a naked pair 34 in col 8 |
Aha! There it is! Thanks. |
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Clement
Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
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| Posted: Wed Nov 26, 2008 7:43 pm Post subject: Daily Sudoku: Thu 26-Nov-2008 VH |
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| XY-Wing {679} with pivot{69} in r3c4 eliminating the 7's in BLOCK5c6. To avoid the DP in the resulting UR{5,8} in BLOCK4&5, 6 should be eliminated in r3c3. This solves the puzzle. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Wed Nov 26, 2008 11:12 pm Post subject: |
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I found a finned x-wing on <7>, but then saw the xyz-wing on <368> and realized it lead to the same deletions as the finned x-wing but also solved the puzzle.
Ted  |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Thu Nov 27, 2008 10:00 pm Post subject: |
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| Was away for this one - so surprised no one cited the xyz wing on <678> as a one-stepper. The elimination knocks off 2 rows of 7s in Box 5 - then it's curtains. |
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