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Tough Sudoku for 10/April/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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Basics to 24
1. (4)a2=a9-b8=(4-9)f8=(9)f2 =>-9a2; basics to 31
2. Skyscraper (6)i3=i8-b8=b2 =>-6c3, -6h2; basics to 42
3. (6)c9=h9-(6=8)h5-(8=4)b5-b8=f8-(4=2)f9-(2=6)d7 =>-6c7; basics to 52
4. (5)b6=(5-8)b4=(8-7)f4=(7-4)f8=b8-(4=8)b5-h5=(8)h6 =>-5h6; singles to 81
10/Apr/19 2:03 AM
Basics to 24
1. X-chain x=6 =>[c3,h2]<>6 if f8=9 =>b8=4
a79=58 a3=7 a2=4 a1=e1=9 => g8=9 Basics to 42
2.if f8=4 =>e4=b6=0 => b8=4 solve
10/Apr/19 4:06 AM
Nice photo of this river.
10/Apr/19 4:43 AM
24 singles
4 a9 f8 => 9 e7 g8. OR
4 b1 9 a1 f2 => 9 e7 g8

6 bc2 => 7 h2. OR
6 c3 b8 5 i8 g3 => 7 h2 up43

7 d8 6 d7 b8c9 2 c7 => 2 b1 OR
7 f8 4 f9 b8 2 c79 => 2 b1 Solve
10/Apr/19 6:05 AM
Basics to 42
2.X-chain x=2 => d1<>2 if d8=7 => UR 27 df48
=> f8=7 solve d8=f4=e1=c5=7 d1=f6=8 d6=1 d4=2
d7=6 b7=2 b3=8 c1=5 c4=e4=34 g4==i3=5 i8=6 b8=4
10/Apr/19 4:33 PM
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