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Tough Sudoku for 4/March/2010

                 
                 
                 
                 
                 
                 
                 
                 
                 

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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Another beautiful beach! I think Gath is trying to tease us hibernating North Americans to visit Australia with beach photos!!!
04/Mar/10 12:14 AM
I think I am ready for Spring!!!!!
04/Mar/10 12:25 AM
Me too, Debby... Me too!
04/Mar/10 1:56 AM

Too too tough today.
04/Mar/10 2:49 AM
Another gorgeous cove...what a treat!
04/Mar/10 3:52 AM
maen all! more bluffs...these are reminding me of kitty hawk on the outer banks where the wright brothers first took flight...sections of the tram tracks they used to get up to speed are still there. we stopped by a few weeks back...we'll be headed back inland along the blue ridge in a couple of weeks.
04/Mar/10 4:14 AM
These beach photos are giving me the travel bug ... any volunteers to cat-sit?
04/Mar/10 4:57 AM
1. Unique possibilities to 27.
2. If a4=1,a2=25.If a4=7,a2=2 (to avoid the 15 unresolvable rectangle at ab26);so a2=25.
3. If i7=2=h1=d2,a2=5,b2=1,f2=9,b3=7;g23/i2 would each =38.Hence h7=2 (triple 256 at i123);pair 25 at ai2;b2=1;d1=2.UP30.
4. If i8=9,i7=13.Also if i8 is not 9,pair 18 at More...
04/Mar/10 9:19 AM
oh, I thought it was called Rick's beach!!!?
04/Mar/10 10:46 AM

Hi Alfred,
As I said above,I found this one very difficult and I failed to solve.Maybe I'll be back.
For your step 2 we can write:
2)AUR(15)ab26: (2)a2=(7)ab6-(7=1)a4,=>a2<>1
Regards,Sotir.
05/Mar/10 1:02 AM
Hi All,

I couldn't solvce this with Eureka notation. I di find a backdoor or 1 in c8, but could not find anything to prove it. Best regards, Neil
PS: I will still keep trying.
05/Mar/10 2:05 AM

Maybe I was lucky for this one:

1)Start at 23,basic techniques to UP=27.
2)Loop: (hp56=5)i123-(15=2)ab2-ac3=(2)i3,=>f2<>5,gi2<>1,c1<>2,i1<>123,i3<>3 8
3)AUR(15)ab26: More...
05/Mar/10 7:05 AM
Thanks Sotir, I will look at your solution to see what I missed - many thanks. Best regards, Neil
05/Mar/10 10:04 PM
Took me over an hour to solve
07/Mar/10 2:00 AM

SE=8.9
10/Sep/10 8:58 PM
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