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June 22, VH

 
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Sun Jun 22, 2008 11:30 am    Post subject: June 22, VH Reply with quote

How come I'm first this late in the day?

Did it with two ERs. One on <4> using C9/B7) gets rid of the <4> in R5C2. One one <5> (C9/B7) gets rid of the <5> in the same cell. Easy going from there.
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

PostPosted: Sun Jun 22, 2008 12:13 pm    Post subject: Re: June 22, VH Reply with quote

cgordon wrote:
How come I'm first this late in the day?

Perfect weather ... lots to do on a beautiful Sunday morning ... never even turned on the PC... ah, "real" life !

Now, after a very nice meal (spaghetti with pesto, hmmmm delicious!), time to exercise the brain ...

In this position,


Code:

+--------------------------+--------------------------+--------------------------+
| 1       8       345      | 7       36      356      | 69      4569    2        |
| 9       7       35       | 4       2       356      | 8       56      1        |
| 45      6       2        | 8       9       1        | 45      7       3        |
+--------------------------+--------------------------+--------------------------+
| 3       1       46       | 69      5       48       | 2       489     7        |
| 456     245     9        | 26      38      7        | 1       38      45       |
| 8       245     7        | 29      1       34       | 39      3459    6        |
+--------------------------+--------------------------+--------------------------+
| 2       45      68       | 3       7       68       | 45      1       9        |
| 7       9       1        | 5       4       2        | 36      36      8        |
| 456     3       4568     | 1       68      9        | 7       2       45       |
+--------------------------+--------------------------+--------------------------+

two overlapping xy-wings (46-48-68, 68-46-48 ) in boxes 4 and 5.
Later, two xyz-wings (4,5,6 and/or 2,4,5 in box 4)
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Johan



Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium

PostPosted: Sun Jun 22, 2008 12:56 pm    Post subject: Reply with quote

I used the <45> remote pair(abcd) to eliminate <45> in R9C1.
Code:
+--------------------------+-------------------------+-------------------------+
| 1          8       345   | 7         36       356  | 69       4569       2   |
| 9          7       35    | 4         2        356  | 8        56         1   |
| 45 a       6       2     | 8         9        1    | 45 b     7          3   |
+--------------------------+-------------------------+-------------------------+
| 3          1       46    | 69        5        48   | 2        489        7   |
| 456        245     9     | 26        38       7    | 1        38         45  |
| 8          245     7     | 29        1        34   | 39       3459       6   |
+--------------------------+-------------------------+-------------------------+
| 2          45      68    | 3         7        68   | 45 c     1          9   |
| 7          9       1     | 5         4        2    | 36       36         8   |
|-[45]6      3       4568  | 1         68       9    | 7        2        d 45  |
+--------------------------+-------------------------+-------------------------+
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

PostPosted: Sun Jun 22, 2008 1:12 pm    Post subject: Reply with quote

Code:
+--------------------------+-------------------------+-------------------------+
| 1          8       345   | 7         36       356  | 69       4569       2   |
| 9          7       35    | 4         2        356  | 8        56         1   |
| 45         6       2     | 8         9        1    | 45       7          3   |
+--------------------------+-------------------------+-------------------------+
| 3          1       46    | 69        5        48   | 2        489        7   |
| 456        2-[45}  9     | 26        38       7    | 1        38         45 d|
| 8          245     7     | 29        1        34   | 39       3459       6   |
+--------------------------+-------------------------+-------------------------+
| 2          45 a    68    | 3         7        68   | 45 b     1          9   |
| 7          9       1     | 5         4        2    | 36       36         8   |
|456         3       4568  | 1         68       9    | 7        2         45 c |
+--------------------------+-------------------------+-------------------------+


Johan, I used a second <45> Remote Pair(abcd) to shot the puzzle down.

Ted
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Sun Jun 22, 2008 2:54 pm    Post subject: Reply with quote

I used the remote pair. I think only one is needed.

Does draw / play use the remote pair, or does it go for the wings?

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Sun Jun 22, 2008 3:31 pm    Post subject: Reply with quote

Ted's Remote Pairs was the only move needed.
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Florida Bob



Joined: 25 Jul 2007
Posts: 12

PostPosted: Sun Jun 22, 2008 4:32 pm    Post subject: Reply with quote

I used the the 46-46-68 x-wing to eliminate the 6 in r7c3. This eventually exposed the ER in box 1 & 2 which broke the puzzle.
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Johan



Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium

PostPosted: Sun Jun 22, 2008 6:15 pm    Post subject: Reply with quote

Quote:
Johan, I used a second <45> Remote Pair(abcd) to shot the puzzle down.


Nice shot Ted
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Sun Jun 22, 2008 9:19 pm    Post subject: Reply with quote

Geez Guys: I've been around for a year or two but this is the first time I've heard of "Remote Pairs" - let alone seeing them given so much discussion in a forum.
I looked "Remote Pairs" up on one of the Sudoku sites and concluded this is NOT a good way to finish a puzzle. It's like colouring - it's a chain process. One step above guessing and seeing where the chain ends up.

I've see colouring cited more and more in recent posts. This is Ok for some of them "Other Puzzles" when no other standard VH solutions work. But in our VH's we can ALWAYS complete by using wings, UR's and Er's without having to resort to laborious and unsophisticated methods.

Be gentle with replies eh.
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

PostPosted: Mon Jun 23, 2008 4:49 pm    Post subject: Reply with quote

cgordon wrote:
... without having to resort to laborious and unsophisticated methods.

Be gentle with replies eh.


Being very gentle now Smile :
Beauty lies in the eye of the beholder.
variatio delectat.
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Mon Jun 23, 2008 11:47 pm    Post subject: Reply with quote

cgordon wrote:
Geez Guys: I've been around for a year or two but this is the first time I've heard of "Remote Pairs" - let alone seeing them given so much discussion in a forum.
I looked "Remote Pairs" up on one of the Sudoku sites and concluded this is NOT a good way to finish a puzzle. It's like colouring - it's a chain process. One step above guessing and seeing where the chain ends up.

I've see colouring cited more and more in recent posts. This is Ok for some of them "Other Puzzles" when no other standard VH solutions work. But in our VH's we can ALWAYS complete by using wings, UR's and Er's without having to resort to laborious and unsophisticated methods.

Be gentle with replies eh.


remote pairs will and should be your best friend in puzzles with a tiny bit more difficulty than these VHs. of course remote pairs often come in many varieties as seen over in the "other puzzles" section.
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Tue Jun 24, 2008 3:59 am    Post subject: Reply with quote

cgordon wrote:
it's a chain process. One step above guessing and seeing where the chain ends up.

Be gentle with replies eh.

I suppose I don't get it. X and Y are candidates, a, b, c, and d, denote cells that have X and Y as the only two candidates.

Naked pair XYa-XYb. No other cell in the same house (that sees both cells a and b) can be X or Y. Acceptable?

Remote pair XYa-XYb-XYc-XYd. No cell that sees both a and b, or b and c, or c and d, can be X or Y. Acceptable? No cell that sees both a and d can be X or Y. Unacceptable?

In the limit, a naked single (solved cell) is a chain of length zero (or one, depending on how you count, links or cells).

Exhaustive search ("guessing", to some) is a perfectly valid logical technique. Your opinion does not invalidate it.

My opinion on this has changed over the years. I used to think that any chain longer than an XY-wing was guessing. Now, I think that people see possible patterns and clues, and I should try to understand how they see them.

It's sort of like playing chess. You can think only two moves ahead, and regard all the rest as luck and guesswork. Or, you can figure out how to think three, then four, then ... moves ahead.

Gentle enough?

Keith
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ravel



Joined: 21 Apr 2006
Posts: 536

PostPosted: Tue Jun 24, 2008 10:38 pm    Post subject: Reply with quote

nataraj wrote:
Now, after a very nice meal (spaghetti with pesto, hmmmm delicious!), time to exercise the brain ...
Oh, not my taste, students junk food in my mind - but with seafood "everything goes" Smile
cgordon wrote:
I looked "Remote Pairs" up on one of the Sudoku sites and concluded this is NOT a good way to finish a puzzle. It's like colouring - it's a chain process. One step above guessing and seeing where the chain ends up.
Didn't they jump into your eyes, more than a wing ?
Quote:
Be gentle with replies eh.
No problem here, as you can see.
nataraj wrote:
variatio delectat.
Exactly my taste, variations of seafood Smile
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Tue Jun 24, 2008 10:56 pm    Post subject: Reply with quote

I will eat my French Canadian poutine (fries, cheese and gravy) and yield to those who are more cleverer than what I am.
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

PostPosted: Wed Jun 25, 2008 1:22 pm    Post subject: Reply with quote

ravel wrote:
students junk food in my mind


Not junk at all. Pesto is a delicious cold sauce. Here's the recipe (serves 2):

- 2 handful of fresh basil leaves, washed and chopped
- 50 g (gram) pignoli (pine nuts)
- 2-3 cloves of garlic
- 100 g Grana or Parmesan cheese, freshly grated from a whole piece
- 1 cup of extra vergine olive oil
- salt and black pepper

In a blender/food processor, grind the pignoli. add pressed garlic and the basil leaves. Alternate between pulsing the blender and adding cheese and olive oil.

Salt and pepper vigorously.

Put on top of the hot spaghetti.

Makes very thirsty, so careful with that Chianti!

enjoy Smile
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ravel



Joined: 21 Apr 2006
Posts: 536

PostPosted: Wed Jun 25, 2008 6:56 pm    Post subject: Reply with quote

Thanks, my friend is interested - and we have living basil leaves (oh the cruel people, that amputate plants just for pleasure).
Maybe i take a half portion as a starter for grilled fish Smile
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Wed Jun 25, 2008 7:52 pm    Post subject: Reply with quote

and who says sudoku isn't life Very Happy
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Wed Jun 25, 2008 10:08 pm    Post subject: Reply with quote

ravel wrote:
Thanks, my friend is interested - and we have living basil leaves (oh the cruel people, that amputate plants just for pleasure).
Maybe i take a half portion as a starter for grilled fish Smile


ravel, try the pesto as a sauce for the grilled fish itself!

Keith
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Thu Jun 26, 2008 11:37 am    Post subject: Reply with quote

You can’t have fish without chips. And I’m not sure you can deep fry and batter fish properly when it’s been pestoed. Anyway, I live near Buffalo –famous for its wings (no colouring used).
Bon Appetite
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