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Tough Sudoku for 27/May/2012

                 
                 
                 
                 
                 
                 
                 
                 
                 

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

  1 2 3 4 5 6 7 8 9
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Sudoku Solving Techniques

Submitted by: sudoku lover

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SE=8.3
SSTS to UP=23
1)(6):e7=b7-b1=h1-i2=i5,=>e5<>6
2)AUR(28)cg46:(9)g46=(4)c46-ac5=(4-6)h5=(6)i5,=> i5<>9
3)(2)b3=i3-(2=9)i4=e4-(9=5)e3=(5)i3,=>i3<>2.UP=81
27/May/12 1:01 AM
typo,step 3 to read:
3)(2)b3=i3-(2=9)i4-e4=(9-5)e3=(5)i3,=>i3<>2.UP=81
27/May/12 1:04 AM
1. Note h1i2=36,h79=78.Unique possibilities to 23.
2. If i5=9,i2=6=b1=e7=h5,ab5=4;the 28 rectangle at cg46 cannot be resolved.So i5=6.UP42.
3. Whether e3=9,d3=4;OR e4=9,i4=2;b3=2.UP81.
27/May/12 1:22 AM
13,22
27/May/12 5:01 AM
Definitely not a city centre.
27/May/12 6:43 AM
Just a small satellite town in the iron ore mining shipping centre.
27/May/12 11:58 AM
Red iron soil!!! Thanks Anne!
27/May/12 1:01 PM
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