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Tough Sudoku for 24/September/2008

                 
                 
                 
                 
                 
                 
                 
                 
                 

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

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Sudoku Solving Techniques

Submitted by: sudoku lover

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Neat photo, Sue! I wish this type of decoration would be used these days.
24/Sep/08 12:24 AM
15:15 Maen! Nice arch -- I'd like to see the rest of the building!
24/Sep/08 12:30 AM
Sue, I was right in my guess,that the picture was yours
24/Sep/08 1:11 AM
Great photo, from back in the day when there was such a thing as design ...
24/Sep/08 1:25 AM
maen all! they could have done a nicer job by fixing the facade before painting trim, no?
24/Sep/08 1:31 AM
15:28
24/Sep/08 3:27 AM
Pretty trim. I, too, would like to see the whole building. Is it a Spanish style?

Have a great day/evening everyone!
24/Sep/08 7:30 AM
Great, thanks Sue!
24/Sep/08 10:57 AM
18:37
24/Sep/08 11:09 AM
1.Unique possibillities to 31 cells filled (UP 31).
2.When e7=9,b8=9,h8=1,i9=7,i7=5,i7=6,and locked 6s at a89.
3.When e9=9,e7=6 and again locked 6s at a89, so b5=6.
4.When e7=9,b8=9.When e9=9,e7=6,f8=8,d4=8,d1=1,b3=1 and again b8=9.UP 38.
5.When f8=8,f4=7,and when f8=6,d2=6 and d6=7,so More...
24/Sep/08 12:01 PM
Nice colour, and looks like an interesting courtyard inside, but, I agree, they could have fixed the rest of the wall too!!
24/Sep/08 2:51 PM
1)Start at 22,basic techniques to UP=31
2)Loop:(1)d1=(1-8)d4=(8)f4-(8)f8=(8)a8-(8)a3=(8-1)b3=(1)e3
=>a57<>8
3)(127=8)b123- (8)a3=(8)a8-(8=6)f8-(6=9)e7-(9)b7=(9)b8
=>b8<>1.UP=40
4)AUR(69) at eh79,=>e9<>69.UP=81
25/Sep/08 12:04 AM
An alternative solution (the first one that I've posted).

1) Start at 22, basic to UP=31
2) 678 XY-Wing in d6f48=< d7, f6 <>6
3) (6=8)f8-(8=3)d7-(hp3)d12=(3)f2=>f2<>6, UP=81

Best Regards,

Neil
~
28/Sep/08 3:20 PM

SE=7.1
08/Sep/10 10:42 PM
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