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Tough Sudoku for 6/May/2009

                 
                 
                 
                 
                 
                 
                 
                 
                 

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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Interesting detail, Kate!
06/May/09 12:05 AM
1. Note triple 169 at ace9.Unique possibilities:b9=5,g2=9,i4=6 (UP 26).
2. Note pair 16 at f37.If g1=6,g6=1=c4=a9.Likewise,g3=6,f7=6,e9=9 makes a9=1.So c4=1 (UP 28).
3. If c7=6,f3=6=g1,g6=1,c9=9,locked 8s at gi5 and c5=3.Hence c3 and c8 are not 3;a3=3 and UPs to 33.
4. If More...
06/May/09 2:32 AM
Nice entryway!
06/May/09 5:03 AM
just under 1 hr.
06/May/09 5:13 AM
I really enjoy the pictures.
06/May/09 6:52 AM
1.Start at 23, =>UP=26
2.(8)c1=(8-5)a1=(5-3)a3=c3-(3=6)c7-f7=f3-g3=(6-1)g1=(1-8)g6=(8)gi5
=> c5<>8.UP=27
3.(1)c4=h4-h1=(1-6)g1=g3-h3=h7-e9=(6)c9,=>c9<>1.UP=29
4.Loop:(7=2)b1-b8 =(2-7)c8=(7)c3,=>a13<>7,c8=27.UP=33
5.(5):f2=f5-i5=h4,=>h2<>5.UP=36
6.(3):b4=e4- e7=c7,=>b8<>3.UP=81

06/May/09 7:31 AM
Step 5 is not necessary,thanks
06/May/09 8:59 AM
26:40
11/May/09 2:15 AM

SE=7.3
09/Sep/10 10:31 PM
1.SSTS to UP26
2.(1=9)a9-(9=6)e9-e1=(6-1)g1=g6 > -1a6, UP=28
3.(8=237)cb1c3-(3=6)c7-f7=f3-(6=27)g37-(23)g59=XW(8)gi59
> -8c5, FXW(3)be48, -3e7, UP81
26/Jan/11 3:45 PM
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