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Tough Sudoku for 1/December/2018

                 
                 
                 
                 
                 
                 
                 
                 
                 

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Submitted by: Gath

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Basics to UP = 26
1. (34=9)ef9 - g9 = g1 - (9=58)c18 - [(5&8)=349]cef9 => -34b9
2. (1=59)bg9 - (9=167)ghi7 => -1a7 ; UP = 81
01/Dec/18 12:48 AM
Very interesting puzzle today !
Basics to 26
Doubly linked ALS-XZ rule (134589)bcefg9 -18- (12589)bcgh1 =>-259a1, -59hi9, -1b7, -8c8; singles to 81

Can be presented also as looping ALSs (1=34598)bcefg9 - (8259=1)bcgh1@ => same eliminations
(loop by the weak link 1b9-1b1)
More...
01/Dec/18 1:46 AM
Basics to 26
1.X-chain x=7 =>[a5,a7,h5,h7] <>7
2. if g9=9 => => UR 58 ch89 =>g9=5 solve
01/Dec/18 1:58 AM
#27 1?@a7=>h7=9=>g9=5=>g1=9=>58@c18=>8@hi9=>h8=7=>g7=6=>i7={}=>a7<>1
NB/
#26 159@def2 589@g129 6@de1 126@def8 7@bg57
01/Dec/18 6:07 AM
14:01
01/Dec/18 7:32 AM
15:28.
01/Dec/18 12:10 PM
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