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prakash
Joined: 02 Jan 2008
Posts: 67
Location: New Jersey, USA
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 Posted: Tue May 25, 2010 12:49 am Post subject: May 25 VH |
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| Quote: | | A UR on 23 cracks the puzzle open. Surprisingly, I did not spot any wings. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue May 25, 2010 1:26 am Post subject: |
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| A W-Wing on 17 does it too. |
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roaa
Joined: 18 Apr 2009
Posts: 112
Location: Sweden
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| Posted: Tue May 25, 2010 7:17 am Post subject: |
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| The xyz-wing 167 16 17 makes r4c1=2 which solves the puzzle. |
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Mindwarp
Joined: 13 Sep 2007
Posts: 25
Location: St. Ives, England
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| Posted: Tue May 25, 2010 7:50 pm Post subject: |
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| Didn't need anything special for this one, just filled in the numbers, eliminated those that weren't possible and then used sweep. Finished it in 6 minutes 16 seconds which is fast for me for a VH, usually expect them to take a minimum of 9 minutes. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Wed May 26, 2010 2:26 am Post subject: |
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| Mindwarp wrote: | | Didn't need anything special for this one, just filled in the numbers, eliminated those that weren't possible and then used sweep. Finished it in 6 minutes 16 seconds which is fast for me for a VH, usually expect them to take a minimum of 9 minutes. |
I suspect you made a fortuitous mistake: Sweep this:
| Code: | +----------------+----------------+----------------+
| 3 6 29 | 7 89 5 | 4 129 18 |
| 29 8 4 | 1 3 6 | 7 29 5 |
| 17 17 5 | 2 89 4 | 89 3 6 |
+----------------+----------------+----------------+
| 12 9 8 | 6 12 3 | 5 7 4 |
| 167 4 16 | 5 17 9 | 23 8 23 |
| 257 357 23 | 8 4 27 | 1 6 9 |
+----------------+----------------+----------------+
| 1589 2 139 | 4 57 17 | 6 19 138 |
| 4 13 7 | 9 6 8 | 23 5 123 |
| 689 15 69 | 3 25 12 | 89 4 7 |
+----------------+----------------+----------------+ |
Keith |
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Mindwarp
Joined: 13 Sep 2007
Posts: 25
Location: St. Ives, England
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| Posted: Sun May 30, 2010 11:12 pm Post subject: |
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Hi Keith you could be right, I did it again this time it took 3 minutes 33 seconds I certainly didn't reduce the grid to the same point you have, the key for me was the 23s r5c7, r5,c9, r8,c7 and 123 r8,c9. I assumed r8,c9 was 1 much earlier and the puzzle just solves itself. Maybe my logic is wrong, but it works!  |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Mon May 31, 2010 12:58 am Post subject: |
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You have used a unique rectangle, which is generally considered an advanced move and therefore "special".
Keith |
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Mindwarp
Joined: 13 Sep 2007
Posts: 25
Location: St. Ives, England
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| Posted: Mon May 31, 2010 4:55 am Post subject: |
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| Ah! I must know more than I thought I did about Sudoku solving. |
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