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Tough Sudoku for 4/October/2019

                 
                 
                 
                 
                 
                 
                 
                 
                 

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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 50
1. (5): a7 = gi7 - h8 = h6 - g5 = c5 => -5c8 ; UP = 81
04/Oct/19 12:11 AM
16:59.
04/Oct/19 12:36 AM
Where's the snow? I think this comment is for another photo.
04/Oct/19 5:39 AM
1. Unique possibilities to 50.
2. Whether c5=5;OR g5=5=h8;c8=9.UP81.
04/Oct/19 7:14 AM
Basics to 50
1.X-chain x=5 => [a236,c8,g2,i7]<>5 => c8=9 solve
04/Oct/19 3:54 PM
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