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Tough Sudoku for 20/March/2011

                 
                 
                 
                 
                 
                 
                 
                 
                 

Choose a number, and place it in the grid above.

  1 2 3 4 5 6 7 8 9
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Sudoku Solving Techniques

Submitted by: sudoku lover

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What? Surely I can't be first.
20/Mar/11 12:03 AM

SE=7.2
20/Mar/11 12:08 AM

1)SSTS to UP=31
2)(4=9)a1-(9=7)a9-(7=8)a7-(8=4)e7,=>e1<>4.UP=81.
20/Mar/11 12:22 AM
1. Unique possibilities to 31.
2. Whether a1=4;OR a1=9,a9=7,a7=8,e7=4;e1=4.UP81.
20/Mar/11 12:23 AM
Easy to UP=31
47 ALS-XZ (478)ae7-(479)a19 => e1<>4 UP=81
20/Mar/11 12:23 AM
Sorry, should of course read e1=1.
20/Mar/11 12:25 AM
Have hit the wall ... of tiredness without finishing... so might get back to it in the morning. So much for thinking I wouldn't be tired tonight. all
20/Mar/11 1:22 AM
The endless Canadian sky ...
20/Mar/11 1:26 AM
An easy one today - 10:59.
20/Mar/11 9:09 AM
Not very tough. I used exactly the same chain as sotir (except that I was traversing it in the opposite direction). It was quite easy to spot it, because all the cells involved were dual choices. For some reason I'm drawn to those.
20/Mar/11 11:07 PM
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