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Tough Sudoku for 4/December/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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Looks like a lovely place.
04/Dec/19 5:39 AM
S.E. 9.0
04/Dec/19 10:44 AM
Basics to 25
1. (3)b8=b2-c3=de3-f2=f79 =>-3de8
-----------------
2. Kraken cell (389)f7 =>-9a7
||(3)f7-(3=75)af2-(5=8)c1-(8=2359)ab8.c78
||(8)f7-(8=2359)ab8.c78
||(9)f7
------------ -----
3. (8)ef9=(8-94)ef7=g7-(4=2)g2-g9=(219)ahi9 =>-8a9
4. More...
05/Dec/19 11:08 AM
Basics to 25
1.X-chain x=3 =>[d8,e8]<>3
2. if f2=7 basics to 35 => XY-wing 235 [g9,i68]
=> [g5,i9]<>2 =>g9=2 => a8==e9=e4=f6=d8=0
=>f2=3 X-chain x=5 e79<>5 basics to 34
3. if a8=5 =>a5=e6=d8=g7=4 c7=8 f7=9 f6=h6=28
a7=1 e7=3 =>i6=i7=5 => a8=9 solve
05/Dec/19 4:50 PM
Way too long to finish.
21/Dec/19 11:19 AM
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