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May 27 vh

 
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nataraj



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

PostPosted: Tue May 27, 2008 6:22 am    Post subject: May 27 vh Reply with quote

One is tempted to use the 29 UR that's been there almost from the start.

This time, that UR is no shortcut to the solution.

For me, the move that cracked the puzzle was a single xy-wing. Hint: 24-45-25 with pivot r5c6, takes out 2 from r6c7)
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andras



Joined: 31 Oct 2007
Posts: 56
Location: Mid Wales

PostPosted: Tue May 27, 2008 6:59 am    Post subject: Reply with quote

Somehow I solved it without any advanced techniques at all.

Must be my lucky day! Smile

John
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nataraj



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

PostPosted: Tue May 27, 2008 10:26 am    Post subject: Reply with quote

andras wrote:
Somehow I solved it without any advanced techniques at all.


For me, it was the exact opposite: I overlooked a crucial basic move (3 in box 5 is confined to col 5) and spent like twenty minutes looking for a solution that was not there...Sad

This is where something beyond basics is needed:

Code:

+--------------------------+--------------------------+--------------------------+
| 5       8       13       | 34      9       7        | 26      46      124      |
| 234     7       23       | 6       1       34       | 9       5       8        |
| 14      6       9        | 5       2       8        | 7       3       14       |
+--------------------------+--------------------------+--------------------------+
| 8       2       357      | 1       357     9        | 36      46      45       |
| 39      49      6        | 248     358     45       | 1       7       25       |
| 137     14      1357     | 24      357     6        | 23      8       9        |
+--------------------------+--------------------------+--------------------------+
| 29      5       8        | 7       6       1        | 4       29      3        |
| 6       3       4        | 9       58      2        | 58      1       7        |
| 1279    19      127      | 38      4       35       | 58      29      6        |
+--------------------------+--------------------------+--------------------------+

play online
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tlanglet



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

PostPosted: Tue May 27, 2008 11:30 am    Post subject: Reply with quote

The same xy-wing also takes out the <2> in r5c4, which is also sufficient to solve the puzzle. Cool

Ted
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Marty R.



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

PostPosted: Tue May 27, 2008 3:35 pm    Post subject: Reply with quote

Same here, the 29 UR and the XY to finish it off.
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cgordon



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

PostPosted: Tue May 27, 2008 8:49 pm    Post subject: Reply with quote

Couldn't miss the UR. I was then hoping to find a stylish and elegant solution - but got stuck on the basics. Took me forever to find those naked 3's in Box 5 C5 - and the naked 4's in Box 6 R4. Finished with the xy.
How can one aspire to style and elegance when one cannot even recognise nakedness.
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crunched



Joined: 05 Feb 2008
Posts: 168

PostPosted: Tue May 27, 2008 10:53 pm    Post subject: Reply with quote

cgordon wrote:
Couldn't miss the UR. I was then hoping to find a stylish and elegant solution - but got stuck on the basics. Took me forever to find those naked 3's in Box 5 C5 - and the naked 4's in Box 6 R4. Finished with the xy.
How can one aspire to style and elegance when one cannot even recognise nakedness.


I had the same problems---and you helped me to remove my blinders---or to see the numerals not wearing clothes.
The really weird thing is that I solved the puzzle once; later I decided to do it again to see if it was easier than I originally thought---and I could not remember how I solved it the first time, and I got totally stumped the second time!
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cgordon



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

PostPosted: Tue May 27, 2008 11:37 pm    Post subject: Reply with quote

Quote:
The really weird thing is that I solved the puzzle once; later I decided to do it again to see if it was easier than I originally thought

Hey - first time I did the same - saw the UR and knocked it off in no time at all. Except that I obviously erred. One has to wonder how many sudokus I have completed by lucky errors.
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Wed May 28, 2008 4:25 am    Post subject: Reply with quote

a little late with this one. the draw/play method was definitely a challenge. I had to resort to susser after a good 90 mins of counting rows and columns just to make sure I got all eliminations.

the UR was evident early on, the box/line interactions is what killed me with this one.

mark me down for xy-wing removes 2 in r5c4
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