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Tough Sudoku for 9/November/2019

                 
                 
                 
                 
                 
                 
                 
                 
                 

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

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Submitted by: Gath

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Another relatively easy one.

Basic techniques to UP32
Coloring 6s: a1=a5-f5=d4 => d1<>6, UP52
2s: b9=b1-c2=i2 => i9<>2
5g8=a8-(5=2)a7-(2=8)b9-(8=5)f9 => i9<>5, UP81
09/Nov/19 12:57 AM
Basics to 32
1.X-chain x=6 => [a5,c3,d14,e3,f9] => a5=1
basics to 52
2.XY-wing 2,5,8 => [a7,b9,f9]<>5 => d7=8 solve
09/Nov/19 1:10 AM
1. Unique possibilities to 32.
2. Whether ad1=6;f5=6.UP52.
3. Whether b9=2;OR b9=8=d7;h7=2,UP81.
09/Nov/19 4:08 AM
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