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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Fri Aug 24, 2007 2:24 pm Post subject: Aug 24 VH |
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A UR and the puzzle fell apart.
Seemed too easy.
Earl |
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eddieg
Joined: 12 Jan 2006
Posts: 47
Location: San Diego, CA USA
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| Posted: Fri Aug 24, 2007 2:39 pm Post subject: |
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| Do not discount yourself. Your just getting better. Sometimes the easiest moves can elude you. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Aug 24, 2007 3:50 pm Post subject: |
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| For me it was one X-Wing. |
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TKiel
Joined: 22 Feb 2006
Posts: 292
Location: Kalamazoo, MI
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| Posted: Fri Aug 24, 2007 4:00 pm Post subject: |
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| I saw what Marty saw. I guess I didn't realize that an X-wing still rated a puzzle as VH. |
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Johan
Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium
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| Posted: Fri Aug 24, 2007 4:08 pm Post subject: |
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| Also an UR(type 2) probably the same as Earl. |
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sdq_pete
Joined: 30 Apr 2007
Posts: 119
Location: Rotterdam, NL
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| Posted: Fri Aug 24, 2007 4:36 pm Post subject: |
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We seem to discuss all these things without reference to a specific position... Just to clarify or confirm, yes, a UR in the following position:
| Code: |
+--------------+--------------+-------------+
| 9 35 35 | 4 7 26 | 8 26 1 |
| 28 1 4 | 26 5 89 | 3 7 269 |
| 278 78 6 | 1 89 3 | 249 249 5 |
+--------------+--------------+-------------+
| 4 379 379 | 8 2 1 | 679 5 679 |
| 78 2 789 | 56 4 56 | 1 3 79 |
| 15 6 15 | 9 3 7 | 24 24 8 |
+--------------+--------------+-------------+
| 6 789 1789 | 3 189 289 | 5 289 4 |
| 3 4 589 | 257 6 2589 | 279 1 279 |
| 15 589 2 | 57 189 4 | 679 689 3 |
+--------------+--------------+-------------+
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Play this puzzle online at the Daily Sudoku site
i.e. (is this what you all meant?) I noticed that R2C9 could not be 9 because it would result in the 24 UR. The 26 naked pair that arises unlocks the puzzle.
Peter |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Aug 24, 2007 5:11 pm Post subject: |
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| Quote: | | i.e. (is this what you all meant?) I noticed that R2C9 could not be 9 because it would result in the 24 UR. The 26 naked pair that arises unlocks the puzzle. |
Yes, that was a Type 2 rectangle which essentially accomplishes what the X-Wing does. |
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Asellus
Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
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| Posted: Fri Aug 24, 2007 6:27 pm Post subject: |
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Perhaps a better way to evaluate that UR is to note that the <4>s are locked in an X-Wing pattern. Thus, <2> can be removed from both R3C7 and R3C8.
The result is the same. However, when one of the UR digits forms an X-Wing, I generally find it easier to see the implications. |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Fri Aug 24, 2007 7:35 pm Post subject: |
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Just used x wings and like Tracy, I would question whether x wings rate as a VH.
PS regular fans: if you are looking for an extreme VH try the Escargot I posted in "Other Puzzles". Supposedly designed as the hardest Sudoku ever. I got as far as the naked singles!! |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Aug 25, 2007 1:00 am Post subject: |
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| Asellus wrote: | Perhaps a better way to evaluate that UR is to note that the <4>s are locked in an X-Wing pattern. Thus, <2> can be removed from both R3C7 and R3C8.
The result is the same. However, when one of the UR digits forms an X-Wing, I generally find it easier to see the implications. |
If it's easier for you to see the implications, that's fine, but I don't see why it's a "better" way. But taking note of your X-Wing observation, and I'm no rectangle expert, but it seems that this is simultaneously both a Type 2 and a Type 4 rectangle. |
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Geminie
Joined: 25 Aug 2007
Posts: 1
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| Posted: Sat Aug 25, 2007 6:26 pm Post subject: |
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I got to same stage. And a common "2" in row1 and row 7 eliminate the 2 at r3c8 and r8c6. And then everything is easier now.
| sdq_pete wrote: | We seem to discuss all these things without reference to a specific position... Just to clarify or confirm, yes, a UR in the following position:
| Code: |
+--------------+--------------+-------------+
| 9 35 35 | 4 7 26 | 8 26 1 |
| 28 1 4 | 26 5 89 | 3 7 269 |
| 278 78 6 | 1 89 3 | 249 249 5 |
+--------------+--------------+-------------+
| 4 379 379 | 8 2 1 | 679 5 679 |
| 78 2 789 | 56 4 56 | 1 3 79 |
| 15 6 15 | 9 3 7 | 24 24 8 |
+--------------+--------------+-------------+
| 6 789 1789 | 3 189 289 | 5 289 4 |
| 3 4 589 | 257 6 2589 | 279 1 279 |
| 15 589 2 | 57 189 4 | 679 689 3 |
+--------------+--------------+-------------+
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Play this puzzle online at the Daily Sudoku site
i.e. (is this what you all meant?) I noticed that R2C9 could not be 9 because it would result in the 24 UR. The 26 naked pair that arises unlocks the puzzle.
Peter |
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Asellus
Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
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| Posted: Sat Aug 25, 2007 8:20 pm Post subject: |
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Marty,
Yes, a poor choice of word on my part. I merely meant that it was perhaps easier. |
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