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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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 Posted: Sun Oct 05, 2008 8:36 am Post subject: Oct 5 vh |
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After the first xy-wing (hint:57-79-59 col 8 box 9: r6c8<>5),
I almost overlooked the other one right next to it (57-59-79 col 9: r1c8,r7c9<>7).
Only a one-coffee-puzzle today ... |
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crunched
Joined: 05 Feb 2008
Posts: 168
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| Posted: Sun Oct 05, 2008 11:05 am Post subject: Re: Oct 5 vh |
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| nataraj wrote: |
Only a one-coffee-puzzle today ... |
This puzzle was a beastie for me. For some reason, I could not see/find any wing solutions. Oh, there was an x-wing or two, and I kept thinking there had to be a skyscraper solution...but I could not get anywhere.
Finally, I found the xy wings that you did. This was more like a several pots of coffee puzzle for me. |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Sun Oct 05, 2008 1:03 pm Post subject: |
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I found an x-wing and 4 xy-wings. Only two of the xy-wings were needed to solve the puzzle. It is a good thing I like coffee  |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Oct 05, 2008 3:27 pm Post subject: |
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After basics: | Code: | +-------------------+-------------------+-------------------+
| 6 49 478 | 5 278 2478 | 1 2-79 3 |
| 29 5 1 | 27 6 3 | 247 8 479 |
| 28 3 478 | 9 1 2478 | 257 6 57@ |
+-------------------+-------------------+-------------------+
| 7 8 5 | 3 9 1 | 6 4 2 |
| 4 1 9 | 6 257 27 | 57 3 8 |
| 3 2 6 | 4 578 78 | 9 57@ 1 |
+-------------------+-------------------+-------------------+
| 58 6 348 | 278 237 9 | 34578 1 45-7 |
| 589 7 38 | 1 4 6 | 2358 2-59 59@ |
| 1 49 2 | 78 37 5 | 3478 79@ 6 |
+-------------------+-------------------+-------------------+ |
Ignoring an X-wing <9>, the overlapping XY-wings <579> take out <5> and <7> as shown. This solves it.
My first time through I missed the <5> elimination. I then needed another three XY-wings, and a lot more time!
Keith |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Sun Oct 05, 2008 6:53 pm Post subject: |
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| I did this after the 19th hole – so coffee wasn’t the problem. This was one of those puzzles that looked like a one step pony or whatever it's called - but I still needed an x and two xy’s. |
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Clement
Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
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| Posted: Sun Oct 05, 2008 7:31 pm Post subject: |
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| After the 9's X-Wing in r19c28 eliminating 9 in r8c8 the XY-Wing 579 Pivot at r9c8 {7,9} with Pincers {5,9}r8c9 and {5,7}r6c8 which eliminates 5 in r8c8 leaving 2 as the only candidate in r8c8, the puzzle is solved. |
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DennyOR
Joined: 12 Sep 2007
Posts: 33
Location: Portland, Oregon
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| Posted: Sun Oct 05, 2008 7:44 pm Post subject: |
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I didn't check which of these XYs turned out to be unnecessary:
59-97-75
72-29-94-49-97
73-34-42-27
48-82-29-94
95-57-79 |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Sun Oct 05, 2008 7:57 pm Post subject: |
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keith said: | Quote: | Ignoring an X-wing <9>, the overlapping XY-wings <579> take out <5> and <7> as shown. This solves it.
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Beautiful!  I missed the second 579. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Oct 05, 2008 9:19 pm Post subject: |
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| arkietech wrote: | | Beautiful! I missed the second 579. |
Though I found it independently, credit should go to Nataraj. See the first post in this thread.
Keith |
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