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Tough Sudoku for 21/February/2008

                 
                 
                 
                 
                 
                 
                 
                 
                 

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

  1 2 3 4 5 6 7 8 9
Check out the latest post in the Sudoku Forum

Sudoku Solving Techniques

Submitted by: sudoku lover

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uhmm..sigh of relief..a repeat which isnt mine..
:)...
cheers.
21/Feb/08 12:23 AM
What an interesting flower! What is it?
21/Feb/08 12:45 AM
Pretty!
21/Feb/08 12:58 AM
A path to solve this one - luckily It’s not tough as yesterday :-)
Start at 22
1- Basic techniques UP 31 (note : pairs 27 at g45, 35 at bh4, 28 at a15)
2- XY-Wing : a4=28, c6=78, g4=27 => bc5<>7, UP 36
(g4=7==g4=2 – a4=2==a4=8 – c6=8==c6=7) – note : pair 79 at df4
3- f1=3==d3=3 – d9=3==d9=9 – d4=9==f4=9 => f1<>9, UP 81
21/Feb/08 1:00 AM
An interesting looking specimen.
21/Feb/08 1:00 AM
Oops...! Typo at step 3 (d2=3 not d3=3)
3- f1=3==d2=3 – d9=3==d9=9 – d4=9==f4=9 => f1<>9, UP 81
21/Feb/08 1:03 AM
Very ugly but very cool at the same time!
21/Feb/08 2:25 AM
Good afternoon to all. Is this the star of "Little Shop of Horrors?"
21/Feb/08 4:12 AM
21:51
21/Feb/08 4:39 AM
Agree, Pretty Ugly, more pretty then ugly.
21/Feb/08 7:27 AM
Sue's sunflower. Extraordinary photo!
21/Feb/08 7:47 AM
Not a sunflower. Maybe a cactus?
(Ignore me. Used 3 guesses and don't deserve to be here.)
21/Feb/08 8:00 AM
Kate, I agree, a wonderful photo. And not ugly - look at those beautiful colors.
21/Feb/08 8:01 AM
Besides the AUR, does anyone look for or find any more complex forms of non-uniqueness?
Example 1: ab1 = (1,2) ; ab5 = (2,3) ; ab9 = (1,3) would allow for two feasible solutions.
Example 2: abc1 = (1,2), (2,3), (1,3) respectively; abc5 = (2,3) , (1,3), (1,2); and abc9 = (1,3), (1,2), (2,3)
Example 3: ad1, cf3, ad4, cf6 all (1,2)
21/Feb/08 9:23 AM
No, sorry, not a nice specimen...plant "cancer" caused by some disorder eg a virus..sometimes occurs when chemical pesticides have been used around the area.
21/Feb/08 10:29 AM
16:29 - looks like a land-borne sea anemone!
21/Feb/08 9:30 PM
That looks remarkably like the plant out of 'Little Shop of Horrors'!
OOH snap CG!
21/Feb/08 9:33 PM

SE=7.1
07/Sep/10 10:52 PM
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