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March 23 vh

 
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nataraj



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

PostPosted: Mon Mar 23, 2009 7:50 am    Post subject: March 23 vh Reply with quote

A two+ coffee puzzle.

Hint: Two steps: x-wing (3) cols 2,7 opens an xy-wing 26-16-12 col 7 / box 9
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cgordon



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

PostPosted: Mon Mar 23, 2009 2:03 pm    Post subject: Reply with quote

Yes. Same solution for me - but it took me more than two coffees - almost into Miller time. A veritable challenge!
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Marty R.



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

PostPosted: Mon Mar 23, 2009 3:57 pm    Post subject: Reply with quote

A slightly convoluted XY-Chain exposed a puzzle-finishing XY-Wing.
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Clement



Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania

PostPosted: Mon Mar 23, 2009 5:03 pm    Post subject: Daily Sudoku: Mon 23-Mar-2009 VH Reply with quote

XY-Wing 126 with Pivot {16}r7c7 solves the puzzle.
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nataraj



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

PostPosted: Mon Mar 23, 2009 6:58 pm    Post subject: Reply with quote

cgordon wrote:
took me more than two coffees - almost into Miller time. ...


Shocked my computer says time of post 2pm UTC or roughly 9am EST Shocked

Now that makes me wonder about your current timezone ... Sláinte! 干杯 (gan bei) ! Very Happy
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nataraj



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

PostPosted: Mon Mar 23, 2009 7:42 pm    Post subject: Reply with quote

nataraj wrote:
cgordon wrote:
took me more than two coffees - almost into Miller time. ...


Shocked my computer says time of post 2pm UTC or roughly 9am EST Shocked

Now that makes me wonder about your current timezone ... Sláinte! Prost! לְחַיִּים ! 干杯 (gan bei) ! Very Happy
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cgordon



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

PostPosted: Mon Mar 23, 2009 8:25 pm    Post subject: Reply with quote

Quote:
Now that makes me wonder about your current timezone ... Sláinte! Prost!


I might start early but I always stop after two (2:30 at the latest.) Twisted Evil
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Julie Dachs



Joined: 03 Jun 2006
Posts: 2

PostPosted: Mon Mar 23, 2009 10:52 pm    Post subject: Reply with quote

I'm assuming that you have to eliminate the 3 in r8c9 in order to set up the the 126 xy-wing that solves the puzzle. But how do you do that? What am I missing?
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keith



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

PostPosted: Mon Mar 23, 2009 11:13 pm    Post subject: Reply with quote

After basics:

Code:
+----------------+----------------+----------------+
| 147  57   9    | 3    8    6    | 15   2    14   |
| 134  6    2    | 5    14   7    | 8    9    134  |
| 1348 35   348  | 14   9    2    | 135  6    7    |
+----------------+----------------+----------------+
| 5    2    7    | 6    3    1    | 9    4    8    |
| 38   9    38   | 7    5    4    | 26   1    26   |
| 6    4    1    | 8    2    9    | 7    3    5    |
+----------------+----------------+----------------+
| 2    8    45   | 14   67   3    | 16   57   9    |
| 347  37   6    | 9    14   5    | 123  8    123  |
| 9    1    35   | 2    67   8    | 4    57   36   |
+----------------+----------------+----------------+

I do not see an XY-wing. There is a type-3 UR taking out <1> in R3C7 (which you don't need), and there is an X-wing on <3>.

After the X-wing, there is an XY-wing 1-26.

Keith


Last edited by keith on Tue Mar 24, 2009 2:03 am; edited 1 time in total
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Julie Dachs



Joined: 03 Jun 2006
Posts: 2

PostPosted: Tue Mar 24, 2009 12:02 am    Post subject: 3/23 Very hard Reply with quote

Thanks Keith,

The x-wing on 3 did the trick!
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crunched



Joined: 05 Feb 2008
Posts: 168

PostPosted: Tue Mar 24, 2009 12:53 am    Post subject: Reply with quote

I had the same solution as Keith, et al. But keith had more numbers removed from basics. I did not get as many "basic" numbers removed.
By the way, there is a 3-5-7 xyz wing in boxes 4 & 7.
Oh, now I see it. A box line reduction on 5 in c3/box 7
Code:

+---------------+-----------+------------+
| 1457  57 9    | 3  8    6 | 15  2  14  |
| 134   6  2    | 5  14   7 | 8   9  134 |
| 13458 35 3458 | 14 9    2 | 135 6  7   |
+---------------+-----------+------------+
| 57    2  57   | 6  3    1 | 9   4  8   |
| 38    9  38   | 7  5    4 | 26  1  26  |
| 6     4  1    | 8  2    9 | 7   3  5   |
+---------------+-----------+------------+
| 2     8  457  | 14 1467 3 | 16  57 169 |
| 347   37 6    | 9  147  5 | 123 8  123 |
| 9     1  357  | 2  67   8 | 4   57 36  |
+---------------+-----------+------------+

Play this puzzle online at the Daily Sudoku site
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Tue Mar 24, 2009 1:13 am    Post subject: Reply with quote

Code:
.------------------.------------------.------------------.
| 147  *57    9    | 3     8     6    |*15    2     14   |
| 134   6     2    | 5     14    7    | 8     9     134  |
| 1348  35    348  | 14    9     2    | 135   6     7    |
:------------------+------------------+------------------:
| 5     2     7    | 6     3     1    | 9     4     8    |
| 38    9     38   | 7     5     4    | 26    1     26   |
| 6     4     1    | 8     2     9    | 7     3     5    |
:------------------+------------------+------------------:
| 2     8     45   | 14    67    3    |*16    57    9    |
| 347  *37    6    | 9     14    5    |12-3   8     123  |
| 9     1     35   | 2     67    8    | 4     57   *36   |
'------------------'------------------'------------------'

xy-chain does it in one.
starting in r8c2 ...
37-75-51-16-63
removes 3 from r8c7
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tlanglet



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

PostPosted: Tue Mar 24, 2009 1:41 pm    Post subject: Reply with quote

storm_norm wrote:
Code:
.------------------.------------------.------------------.
| 147  *57    9    | 3     8     6    |*15    2     14   |
| 134   6     2    | 5     14    7    | 8     9     134  |
| 1348  35    348  | 14    9     2    | 135   6     7    |
:------------------+------------------+------------------:
| 5     2     7    | 6     3     1    | 9     4     8    |
| 38    9     38   | 7     5     4    | 26    1     26   |
| 6     4     1    | 8     2     9    | 7     3     5    |
:------------------+------------------+------------------:
| 2     8     45   | 14    67    3    |*16    57    9    |
| 347  *37    6    | 9     14    5    |12-3   8     123  |
| 9     1     35   | 2     67    8    | 4     57   *36   |
'------------------'------------------'------------------'

xy-chain does it in one.
starting in r8c2 ...
37-75-51-16-63
removes 3 from r8c7


I found the same xy-chain. It also deletes <3> from r8c9.

Ted
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