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Tough Sudoku for 21/July/2019

                 
                 
                 
                 
                 
                 
                 
                 
                 

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

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Check out the latest post in the Sudoku Forum

Sudoku Solving Techniques

Submitted by: sudoku lover

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SE=9.1
21/Jul/19 12:08 AM
31:43.
21/Jul/19 2:42 AM
What's the temperature?
21/Jul/19 4:27 AM
I resorted to guessing for this one.
21/Jul/19 6:43 AM
9:10
21/Jul/19 3:12 PM
Basics to 25
1.X-chain x=1 =>[a1,a3,b4,b5]<>1 if b123=1 c3=6
a8=6 basics to 27
2.if b3=1 a3=b2=49 if a3=9 =>f9 =d2=0
if a3=4 => b1=a8=d9=0 =>b3<>1
3.if b2=1 => a3=b3=49 e7=g9=0 =>b2<>1 => b1=1
basics to 45
4. if More...
21/Jul/19 8:29 PM
Basics to 25
1. (1)a6=h6-h2=(1)b2 =>-1a13
2. (25678=1)ab1.c123-b2=h2-(1=2678)cghi3 => 2ab3, -6a3, -8b3; basics to 27
3. (4)ab8=b7-b2=df2-e3=(4)e79 =>-4df8
4. (5=8)i2-(8=2)c2-(2=5)c6 =>-5i6
5. (5=8)i2-ghi3=e3-(8469=2)d1256-(2=6)f1-f4=(6)i4 =>-5i4; basics to 28
6. More...
23/Jul/19 12:48 AM
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