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Apr 22 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 640
Location: Dar es Salaam Tanzania

PostPosted: Sat Apr 21, 2012 10:47 pm    Post subject: Apr 22 VH Reply with quote

XY-Wing 167 pivoted in r6c4 solves it by setting r2c2<>6.
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sheryl



Joined: 24 Sep 2007
Posts: 64
Location: New York

PostPosted: Mon Apr 23, 2012 1:46 pm    Post subject: your solution Reply with quote

my row r6c4 is 17, my r2c2 is 136 so i don't understand your solve, can you please explain. thanks.
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Marty R.



Joined: 12 Feb 2006
Posts: 5065
Location: Rochester, NY, USA

PostPosted: Mon Apr 23, 2012 3:34 pm    Post subject: Re: your solution Reply with quote

sheryl wrote:
my row r6c4 is 17, my r2c2 is 136 so i don't understand your solve, can you please explain. thanks.


The 167 refers to the three numbers involved. The wing is 17 in r6c4, 16 in r2c4 and 67 in r6c2. R2c2 sees both of the 6s so it can't contain a 6.
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arkietech



Joined: 31 Jul 2008
Posts: 1687
Location: Northwest Arkansas USA

PostPosted: Mon Apr 23, 2012 3:41 pm    Post subject: Reply with quote

I got to this grid after basic moves.
Code:
 *-----------------------------------------------------------*
 | 7     8     69    | 4     1569  59    | 3     19    2     |
 | 39    136   2     | 16    1689  7     | 4     189   5     |
 | 5     14    49    | 3     1289  289   | 6     189   7     |
 |-------------------+-------------------+-------------------|
 | 2     357   1     | 57    345   45    | 8     6     9     |
 | 39    35    589   | 2     3589  6     | 1     7     4     |
 | 4     67    689   | 17    189   89    | 5     2     3     |
 |-------------------+-------------------+-------------------|
 | 1     9     7     | 56    56    3     | 2     4     8     |
 | 6     245   45    | 8     7     24    | 9     3     1     |
 | 8     24    3     | 9     24    1     | 7     5     6     |
 *-----------------------------------------------------------*

can you see the 176 wing?

Grids help.
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sheryl



Joined: 24 Sep 2007
Posts: 64
Location: New York

PostPosted: Mon Apr 23, 2012 3:43 pm    Post subject: my r2c2 Reply with quote

is a 136 so i need to know how you got rid of the 3
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sheryl



Joined: 24 Sep 2007
Posts: 64
Location: New York

PostPosted: Mon Apr 23, 2012 3:45 pm    Post subject: grid after basics Reply with quote

my grid is the same, i do not see the 176 wing, please explain
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Marty R.



Joined: 12 Feb 2006
Posts: 5065
Location: Rochester, NY, USA

PostPosted: Mon Apr 23, 2012 3:47 pm    Post subject: Re: my r2c2 Reply with quote

sheryl wrote:
is a 136 so i need to know how you got rid of the 3


After you get rid of the 6, only one 6 remains in box one and things will fall out as you continue from there.
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sheryl



Joined: 24 Sep 2007
Posts: 64
Location: New York

PostPosted: Mon Apr 23, 2012 4:31 pm    Post subject: sorry, i have Reply with quote

no idea what you mean. can you be more specific how do you get rid of the 3 is 136 r2c2
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arkietech



Joined: 31 Jul 2008
Posts: 1687
Location: Northwest Arkansas USA

PostPosted: Mon Apr 23, 2012 5:10 pm    Post subject: Re: grid after basics Reply with quote

sheryl wrote:
my grid is the same, i do not see the 176 wing, please explain
Code:
 *-----------------------------------------------------------*
 | 7     8     69    | 4     1569  59    | 3     19    2     |
 | 39    13-6  2     |a16    1689  7     | 4     189   5     |
 | 5     14    49    | 3     1289  289   | 6     189   7     |
 |-------------------+-------------------+-------------------|
 | 2     357   1     | 57    345   45    | 8     6     9     |
 | 39    35    589   | 2     3589  6     | 1     7     4     |
 | 4    c67    689   |b17    189   89    | 5     2     3     |
 |-------------------+-------------------+-------------------|
 | 1     9     7     | 56    56    3     | 2     4     8     |
 | 6     245   45    | 8     7     24    | 9     3     1     |
 | 8     24    3     | 9     24    1     | 7     5     6     |
 *-----------------------------------------------------------*
if a<>6 then b=7 then c=6 therefore r2c2<>6
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Marty R.



Joined: 12 Feb 2006
Posts: 5065
Location: Rochester, NY, USA

PostPosted: Mon Apr 23, 2012 5:16 pm    Post subject: Re: sorry, i have Reply with quote

sheryl wrote:
no idea what you mean. can you be more specific how do you get rid of the 3 is 136 r2c2


Well, you don't get rid of the 3 because that cell ends up being solved for 3.
After eliminating the 6 you solve r1c3 for 6. That takes out the 6 in r6c3, leaving r6c2=6. After that the only 7 in row 6 is r6c4. After solving that for 7, you can solve column 4 which leaves r2c4=1 which takes out the 1 from r2c6, leaving only the 3 in that cell.

Hope that's clear enough.

However, if you meant how to get rid of the 6 instead of the 3, then see arkietech's post above.
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sheryl



Joined: 24 Sep 2007
Posts: 64
Location: New York

PostPosted: Mon Apr 23, 2012 6:02 pm    Post subject: xy wing Reply with quote

sorry, i just didn't see the xy wing of 16/17/67. once you pointed that out to me, it solved. thanks. (don't know why i didn't see it, but i didn't)
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