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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Wed Jul 01, 2009 1:58 am Post subject: July 1 VH |
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You can do this the hard way with coloring and wings, or the easy way.
Easy Solution: UR (86) eliminates 8 & 6 in R2C1 and solves the puzzle
Early Earl |
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smegly
Joined: 19 Oct 2008
Posts: 4
Location: Texas
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| Posted: Wed Jul 01, 2009 5:39 am Post subject: |
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Earl,
No coloring here, but it was kinda tough to bust this one. I saw the UR but didn't use that either. xy-wing did it for me if I recall, although and xyz was use one prior to that. Can't remember how it went but it left two equal bi-values in column six in the middle box. I'll have to write down the major moves from now on since I sure can't remember them by the time the puzzle is solved.
P.S. - Funny that you are in St. Louis. I'm up here visiting for a while. |
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crunched
Joined: 05 Feb 2008
Posts: 168
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| Posted: Wed Jul 01, 2009 6:43 am Post subject: |
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Looks like there are multiple wings and things in this puzzle:
An x wing on 4s removes several 4s. Then an xy wing: 23-27-37.
Puzzle after basics:
| Code: |
+--------------+--------------------+----------+
| 67 3 5 | 27 267 8 | 4 9 1 |
| 1678 178 9 | 4 1367 137 | 5 2 68 |
| 68 2 4 | 19 5 19 | 3 7 68 |
+--------------+--------------------+----------+
| 457 579 8 | 79 47 6 | 1 3 2 |
| 1347 179 137 | 12379 123478 13479 | 6 48 5 |
| 2 6 13 | 5 1348 134 | 7 48 9 |
+--------------+--------------------+----------+
| 137 4 2 | 6 9 137 | 8 5 37 |
| 58 58 6 | 37 347 2 | 9 1 347 |
| 9 17 137 | 8 1347 5 | 2 6 347 |
+--------------+--------------------+----------+
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Play this puzzle online at the Daily Sudoku site |
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themarsman
Joined: 17 Jun 2007
Posts: 7
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| Posted: Wed Jul 01, 2009 8:16 am Post subject: |
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| crunched wrote: | Looks like there are multiple wings and things in this puzzle:
An x wing on 4s removes several 4s. Then an xy wing: 23-27-37.
Puzzle after basics:
| Code: |
+--------------+--------------------+----------+
| 67 3 5 | 27 267 8 | 4 9 1 |
| 1678 178 9 | 4 1367 137 | 5 2 68 |
| 68 2 4 | 19 5 19 | 3 7 68 |
+--------------+--------------------+----------+
| 457 579 8 | 79 47 6 | 1 3 2 |
| 1347 179 137 | 12379 123478 13479 | 6 48 5 |
| 2 6 13 | 5 1348 134 | 7 48 9 |
+--------------+--------------------+----------+
| 137 4 2 | 6 9 137 | 8 5 37 |
| 58 58 6 | 37 347 2 | 9 1 347 |
| 9 17 137 | 8 1347 5 | 2 6 347 |
+--------------+--------------------+----------+
|
Play this puzzle online at the Daily Sudoku site |
You still have simple eliminations that you didn't use. In box eight the fours are only in the center column so you can eliminate them from box five and solve a lot more of the puzzle. After that a simple XY wing solves it. |
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Mike S
Joined: 15 May 2009
Posts: 6
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| Posted: Wed Jul 01, 2009 9:04 am Post subject: |
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| Code: |
+--------------+--------------------+----------+
| 67 3 5 | 27 267 8 | 4 9 1 |
| 1678 178 9 | 4 1367 137 | 5 2 68 |
| 68 2 4 | 19 5 19 | 3 7 68 |
+--------------+--------------------+----------+
| 457 579 8 | 79 47 6 | 1 3 2 |
| 1347 179 137 | 12379 123478 13479 | 6 48 5 |
| 2 6 13 | 5 1348 134 | 7 48 9 |
+--------------+--------------------+----------+
| 137 4 2 | 6 9 137 | 8 5 37 |
| 58 58 6 | 37 347 2 | 9 1 347 |
| 9 17 137 | 8 1347 5 | 2 6 347 |
+--------------+--------------------+----------+
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I'm very new to sudoku so, I may be way off about this.
In the above code there is 347 in row 8, cols 5 and 9.
There is 1347 in row 9 col 5 and 347 in row 9 col 9.
So, shouldn't that make row 9 col 5 a 1 because if it
isn't then this puzzle could have 3 solutions? Anyway,
I used that "logic" and solved the puzzle. Maybe I
just got lucky. |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Wed Jul 01, 2009 12:40 pm Post subject: |
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Fort those who do not like ur's there is:
that solves it. |
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crunched
Joined: 05 Feb 2008
Posts: 168
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| Posted: Wed Jul 01, 2009 1:25 pm Post subject: |
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| themarsman wrote: |
You still have simple eliminations that you didn't use. In box eight the fours are only in the center column so you can eliminate them from box five and solve a lot more of the puzzle. After that a simple XY wing solves it. |
Ahhhh. You are right. The x-wings were not needed. Below is what I got after doing the eliminations themarsman points out: exposing the 2-3-7 xy wing.
| Code: |
+--------------+-------------+----------+
| 67 3 5 | 27 26 8 | 4 9 1 |
| 1678 178 9 | 4 36 37 | 5 2 68 |
| 68 2 4 | 1 5 9 | 3 7 68 |
+--------------+-------------+----------+
| 4 5 8 | 9 7 6 | 1 3 2 |
| 137 9 137 | 23 1238 134 | 6 48 5 |
| 2 6 13 | 5 138 134 | 7 48 9 |
+--------------+-------------+----------+
| 137 4 2 | 6 9 137 | 8 5 37 |
| 3578 78 6 | 37 34 2 | 9 1 347 |
| 9 17 137 | 8 134 5 | 2 6 347 |
+--------------+-------------+----------+
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Play this puzzle online at the Daily Sudoku site |
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ttsmurphy81
Joined: 26 May 2007
Posts: 11
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| Posted: Wed Jul 01, 2009 4:07 pm Post subject: |
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| Somehow I did this one with only simple eliminations in under 6 minutes. No advanced techniques at all. |
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gindaani
Joined: 06 Mar 2009
Posts: 79
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| Posted: Wed Jul 01, 2009 4:33 pm Post subject: |
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| ttsmurphy81 wrote: | | Somehow I did this one with only simple eliminations in under 6 minutes. No advanced techniques at all. |
That happens to me sometimes too. I usually find I cannot repeat the process.  |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Wed Jul 01, 2009 11:39 pm Post subject: |
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I had the same solution as "crunched".
I think the point is, take the "advanced" steps when they become apparent, not when you are sure no other basic steps are possible.
Keith |
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gliebp
Joined: 29 Jun 2009
Posts: 1
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| Posted: Thu Jul 02, 2009 5:14 am Post subject: Re: July 1 VH |
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| Earl wrote: | You can do this the hard way with coloring and wings, or the easy way.
Easy Solution: UR (86) eliminates 8 & 6 in R2C1 and solves the puzzle
Early Earl |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Thu Jul 02, 2009 9:48 pm Post subject: |
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| Mike S wrote: | | Code: |
+--------------+--------------------+----------+
| 67 3 5 | 27 267 8 | 4 9 1 |
| 1678 178 9 | 4 1367 137 | 5 2 68 |
| 68 2 4 | 19 5 19 | 3 7 68 |
+--------------+--------------------+----------+
| 457 579 8 | 79 47 6 | 1 3 2 |
| 1347 179 137 | 12379 123478 13479 | 6 48 5 |
| 2 6 13 | 5 1348 134 | 7 48 9 |
+--------------+--------------------+----------+
| 137 4 2 | 6 9 137 | 8 5 37 |
| 58 58 6 | 37 347 2 | 9 1 347 |
| 9 17 137 | 8 1347 5 | 2 6 347 |
+--------------+--------------------+----------+
|
I'm very new to sudoku so, I may be way off about this.
In the above code there is 347 in row 8, cols 5 and 9.
There is 1347 in row 9 col 5 and 347 in row 9 col 9.
So, shouldn't that make row 9 col 5 a 1 because if it
isn't then this puzzle could have 3 solutions? Anyway,
I used that "logic" and solved the puzzle. Maybe I
just got lucky. |
UR logic tells us that
has two solutions
and
.
you are saying that this
| Code: | 347|347
-------
347|347 |
has three solutions?
hmm...
| Code: |
3|4 1
---
7|3
3|7 2
---
4|3
4|3 3
---
7|4
4|7 4
---
3|4
7|3 5
---
4|7
7|4 6
---
3|7
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in Wapati's thread,
http://www.dailysudoku.com/sudoku/forums/viewtopic.php?t=3731&sid=2a6b59a751cfd1b9fca786e2b2e7cd9d
his example provides your pattern where the logic wouldn't make sense.
| Code: | .------------------.------------------.------------------.
| 7 4 29 | 25 6 1 | 8 3 59 |
| 1 5 269 | 3 79 8 | 279 4 679 |
| 8 69 3 | 25 4 79 | 279 1 5679 |
:------------------+------------------+------------------:
| 69 2 1 | 689 89 4 | 5 7 3 |
| 5 8 69 |*679 3 *679 | 4 2 1 |
| 3 7 4 | 1 2 5 | 6 9 8 |
:------------------+------------------+------------------:
| 2 3 8 |*679 1 *679 | 79 5 4 |
| 49 1 5 | 4789 789 2 | 3 6 79 |
| 469 69 7 | 49 5 3 | 1 8 2 |
'------------------'------------------'------------------' |
in the marked cells above. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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