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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Sun Sep 21, 2008 1:48 am Post subject: A Very Hard |
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While waiting for a VH on this site ... | Code: | Puzzle: BB49114sh
+-------+-------+-------+
| . 1 9 | . . . | 6 4 . |
| 5 . 3 | . . . | 1 . 8 |
| 7 8 . | . . . | . 3 9 |
+-------+-------+-------+
| . . . | 1 7 8 | . . . |
| . . . | 4 . 9 | . . . |
| . . . | 5 3 6 | . . . |
+-------+-------+-------+
| 9 7 . | . . . | . 8 4 |
| 3 . 2 | . . . | 9 . 1 |
| . 5 8 | . . . | 2 7 . |
+-------+-------+-------+ |
The unusual pattern made me abandon my usual solving sequence.
Enjoy!
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Sep 21, 2008 4:46 am Post subject: |
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Definitely an unusual pattern. I'm not sure I'm organized enough to have a usual solving technique. But I solved it in four steps.
| Quote: | | Three colorings (6-4-4) and an M-Wing on 14. |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Sun Sep 21, 2008 4:49 pm Post subject: |
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Hm, interesting pattern, indeed. Made me change my routine, too (usually I start by sweeping the floors and dusting the towers, this time I'd go directly for the houses of 8,6 and 5 solved cells).
After basics
| Code: |
+--------------------------+--------------------------+--------------------------+
| 2 1 9 | 38 -58 a35 | 6 4 7 |
| 5 46 3 | 79 469 47 | 1 2 8 |
| 7 8 b46 | 26 b14-6 12 | 5 3 9 |
+--------------------------+--------------------------+--------------------------+
| 6 2 5 | 1 7 8 | 4 9 3 |
| 18 3 17 | 4 2 9 | 78 6 5 |
| 48 9 47 | 5 3 6 | 78 1 2 |
+--------------------------+--------------------------+--------------------------+
| 9 7 b16 | 26 -15-6 125 | 3 8 4 |
| 3 46 2 | 78 468 47 | 9 5 1 |
| 14 5 8 | 39 149 a13 | 2 7 6 |
+--------------------------+--------------------------+--------------------------+
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an x-wing (6) in cols 3 and 4 opens
two xy-wings (15-13-35 and 14-46-16)
both achieve the same result, namely r7c5=5. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Sep 21, 2008 5:32 pm Post subject: |
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| Quote: | | Made me change my routine, too |
Yes, I resorted to looking for pairs in the blocks where there are no initial clues.
I believe I used two X-wings and one XY-wing.
Keith |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Mon Sep 22, 2008 1:28 am Post subject: |
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| keith wrote: | | Quote: | | Made me change my routine, too |
Yes, I resorted to looking for pairs in the blocks where there are no initial clues.
I believe I used two X-wings and one XY-wing.
Keith |
I also used two x-wings (on <4> & <6>) and a xy-wing on <135>.
Ted |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Mon Sep 22, 2008 2:59 pm Post subject: |
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| I had no problem with R5C5. Then it was an ER on <4>. An x-wing on <6> and an xyz <125>. Good one for the waiting time. |
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