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# Tough Sudoku for 21/February/2008

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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 221- 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 df43- 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