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Tough Sudoku for 1/December/2018

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Submitted by: Gath

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 Basics to UP = 261. (34=9)ef9 - g9 = g1 - (9=58)c18 - [(5&8)=349]cef9 => -34b92. (1=59)bg9 - (9=167)ghi7 => -1a7 ; UP = 81 01/Dec/18 12:48 AM Very interesting puzzle today !Basics to 26Doubly 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