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Tough Sudoku for 27/December/2018

                 
                 
                 
                 
                 
                 
                 
                 
                 

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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17:10.
27/Dec/18 4:03 AM
How sweet! Two for the price of one!
27/Dec/18 5:51 AM
SE=8.3
Basics to UP=26
1)(4)g64=(4-5)g2=(5-6)i2=(6-4)i7=(4)h7,=>h54<>4
2)(9)b5=a5-(9=2)a1-c1=(2-5)c7=(5-7) c8=(7)b98,=>b5<>7
3)(3):fd2=b2-b9=e9,=>e3<>3
4)(9=7)e3-hi3=(7-6)h1=e1-e4=(6-9)f4 =(9)f32,=>h1=67,d21e1<>9,f4=69.UP=81
27/Dec/18 8:45 AM
Basics to 26
1. (9)b5=a5-(9=2)a1-a7=c7-(2148=7)c1246 =>-7b5; basics to 30
2. (3)e9=b9-b2=df2 =>-3e3
3. (5)e7=f8-f5=(5-7)i5=i3-(7=9)e3 =>-9e7; basics to 38
4. (4=5)g2-(5=46)i27 =>-4i3; singles to 81
27/Dec/18 8:52 AM
Basics to 26
1.if i9=7 => b5=7 a5=9 a1=2 c1=4 c4=0 => 19=1
h4=1 g9=7 g8=9 Basics to 30 [b5,i4]<>7
2.X-chain x=3 => e3<>3
3. if i2=6 => e1=6 f4=6 e3=7 d1=4 i3=8 i4=0
=> i7=6 h7=4 h8=3 Basics to 33
4. if e1=6 => f4=6 e3=7 d1=4 c1=2 a1=9 a5=8
h5=0 => f2=6 solve
27/Dec/18 6:27 PM
48:06
28/Dec/18 6:01 AM
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