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Tough Sudoku for 5/January/2019

                 
                 
                 
                 
                 
                 
                 
                 
                 

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Sudoku Solving Techniques

Submitted by: sudoku lover

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SE 6.6
basics to 38, turbot(3)f5=e4-a4=a3 -> -3f3, singles to 81. Many turbots.
05/Jan/19 12:43 AM
29:35.
05/Jan/19 1:24 AM
Keyan for the very unusual photo of mountain tops.
05/Jan/19 5:35 AM
I posted my solution to #641 on the Dec 31, 2018 tough page.
05/Jan/19 9:09 AM
Basics to 38
1. In the 3s, 5-link oddagon (aka broken wing) @cf5, e4, ce1 with a single guardian (3c4) =>c4=3; singles to 81
05/Jan/19 9:10 AM
Basics to 38
1.X-chain x=3 =>[a4,c5,c1,e4,f3]<>3 => a3=3 a4=4
e4=1 f3=4 f5=3...solve
05/Jan/19 5:27 PM
1. Note 89 @ f67,79 @ ce2.Unique possibilities to 38.
2. Whether a34=3;f5=3.UP81.
05/Jan/19 6:35 PM
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