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Tough Sudoku for 13/January/2010

                 
                 
                 
                 
                 
                 
                 
                 
                 

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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I assume that is something leftover from the flower?
13/Jan/10 12:10 AM
Hmmmmm - Interesting......
13/Jan/10 12:41 AM

I also just posted a solution for yesterday,s tough.
13/Jan/10 1:40 AM
12:54 one possibility
13/Jan/10 1:47 AM
1. Note pair 12 at h4/i5.Unique possibilities to 28.
2. If g5=7=h7=b8;column a is devoid of 7.So g5=3.UPs to 39.
3. If i5=1=d4,h4=2 (pair 25 at ac5),i3=3,a3=9=d2,d9=4,d8=8;56 have no place in column d.Hence i5=2.UPs to 81.
13/Jan/10 1:53 AM
Have a great day/night, everyone!
13/Jan/10 2:29 AM
maen all! wonder if those pods open and close like a venus fly trap to capture prey. not too hard with a couple of lucky guesses!
13/Jan/10 3:24 AM
20:34
13/Jan/10 4:26 AM
17:21 Maen! Tree clams, that's what they are. Tree clams.
13/Jan/10 5:45 AM
Banksia are proteas - they grow on trees. My favorite variety is Pink Mink.
13/Jan/10 8:55 AM
Tree clams...that's funny!
13/Jan/10 6:29 PM
Hi All, I could not do this using Eureka notation. I did find a couple of 'Backdoors' - from basic techiques (UP=28) 5 in c8 or 2 in i5 both give UP=81. Best regards, Neil
13/Jan/10 11:57 PM

I also could not find a short path.Interesting is the most of steps are YW-style:
1) Start at 22,basic techniques to UP=27
2) (7): h6=h7-a7=a5,=>g5<>7.UP=39
3)YWS: (2=1)c2-h2=(1-2)h4=(2)c4,=>c589<>2
4)YWS: (8=1)d8-(1=6)d4-(6=48)e36,=>e8<>8.UP=41
5) More...
14/Jan/10 1:01 PM
Hi Sotir,

Thanks for the above solution - I have studied all the YWSs as part of my studies (BTW, step 7 should start (4=1)d9.
Best regards, Neil
14/Jan/10 7:22 PM

SE=7.2
10/Sep/10 10:46 AM
1.SST to UP27
2.kite:(7)h6=h7-a7=a5 > -7g5 UP39
> aur(56)de27 > +6f27
3.(148=6)d489-(6=48)e36 > -4e7, -8e8 UP81
15/Feb/11 5:49 AM
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