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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Sat Feb 07, 2009 3:12 am Post subject: Feb 7 VH |
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An authentic VH. Coloring would not solve it. But an xy-chain did. Either the (12-18) which eliminates the 8 in R8C4 or (7-8-1-2) which eliminates the 2 in the same cell, R8C4, will do it in one step.
Early Earl
PS I missed the (128) xyz-wing. Duh!
Last edited by Earl on Sat Feb 07, 2009 3:32 pm; edited 1 time in total |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Feb 07, 2009 4:19 am Post subject: Re: Feb 7 VH |
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| Earl wrote: | An authentic VH. Coloring would not solve it. But an xy-chain did. Either the (12-1 which eliminates the 8 in R8C4 or (7-8-1-2) which eliminates the 2 in the same cell, R8C4, will do it in one step.
Early Earl |
Not sure that I can agree it is that complex. A xyz-wing <128> with pivot in r8c4 is all that is required.
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Feb 07, 2009 4:43 am Post subject: |
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| I used the XYZ-Wing to finish it off. But before that I played two W-Wings which apparently weren't needed to set up the XYZ. |
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Wendy W
Joined: 04 Feb 2008
Posts: 144
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| Posted: Sat Feb 07, 2009 11:09 pm Post subject: |
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| I'm with Ted. One-step xyz wing, and it was even easy to find. |
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jLo
Joined: 30 Apr 2007
Posts: 55
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| Posted: Sun Feb 08, 2009 7:56 pm Post subject: |
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Not sure which W-wings Marty found, but the one I see produces the
same elimination as the XYZ and breaks things free. |
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kragzy
Joined: 01 May 2007
Posts: 112
Location: Australia
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| Posted: Mon Feb 09, 2009 12:51 am Post subject: |
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My turn to be the dummy who can't see the obvious. This is as far as I got - there must be more eliminations but I cannot see them. Can someone help please!
| Code: |
+-------------+------------------+-----------------+
| 7 58 123 | 4 12358 1358 | 6 9 2358 |
| 568 9 23 | 7 568 58 | 1 23 4 |
| 568 4 123 | 9 123568 1358 | 2578 237 23578 |
+-------------+------------------+-----------------+
| 4 157 8 | 15 9 2 | 3 167 67 |
| 3 2 6 | 18 4 178 | 78 5 9 |
| 15 157 9 | 6 1358 13578 | 4 127 278 |
+-------------+------------------+-----------------+
| 12 13 4 | 125 157 6 | 9 8 2357 |
| 9 138 5 | 128 178 4 | 27 2367 2367 |
| 28 6 7 | 3 58 9 | 25 4 1 |
+-------------+------------------+-----------------+
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wapati
Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.
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| Posted: Mon Feb 09, 2009 1:04 am Post subject: |
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| Row 5. Look at the 1s. |
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kragzy
Joined: 01 May 2007
Posts: 112
Location: Australia
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| Posted: Mon Feb 09, 2009 3:34 am Post subject: |
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Thank you wapati. A case of the bleeding obvious unseen by the bleeding stupid!!
Funny thing though, this solves the puzzle and I had reached the place posted above without using any advanced techniques. Possibly I jagged a lucky mistake. Will try it again when my head is clearer.
Thanks again. |
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kragzy
Joined: 01 May 2007
Posts: 112
Location: Australia
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| Posted: Mon Feb 09, 2009 11:12 pm Post subject: |
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Just for the record - I did this puzzle again and came up with the same solution as Ted and Wendy. My first attempt was appalling, with mistakes both before and after wapati helped me out. Note to self: don't try sudokus on a Monday morning with a foggy head.
Cheers |
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