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Tough Sudoku for 21/October/2019

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Submitted by: Gath

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 1:33. 21/Oct/19 12:42 AM Pretty fast time there, Tom ... 21/Oct/19 12:49 AM Basics to 24 1.X-chain x=4 => h7<>4 => h5=h9=24 =>g5=8 basics to 42 2. if i4=6 =>a6=h7=6 a4=4 a7=g9=1 g7=7 f9=8 i9=4 i7=5 =>d7=0 => i4=5 solve 21/Oct/19 2:42 AM 1. Unique possibilities to 24.2. Whether a4=4=h5;OR a7=4;h59=24.UP42.3. Whether g7=1,d7=7;OR g9=1=f5;f8=5.UP59.4. Whether i4=5;OR i7=5,a7=4;a4=6.UP81. 21/Oct/19 4:14 AM All that glitters is not gold, but in this case I guess it is! 21/Oct/19 5:11 AM Basics to 241. Grouped kite: (4)h5=bc5-a4=a7 =>-4h7; basics to 422. (1=7)g9-g7=d7-(7=16)d9.e8 =>-1f9; basics to 593. BUG+2 (5)h6==(6)i7-(6=5)i4 => -5g6; singles to 81 21/Oct/19 8:22 AM Basics to 241. (4): a7 = a4 - i4 = h5 => -4h7 ; UP = 422. Kraken row (5)dhi7 => -1a7 ; UP = 81|| (5)d7 - (5=81)f89 - (1)e8 = (1)bc8|| (5-6)h7 = h6 - (6=1)a6|| (5-4)i7 = (4)a7 21/Oct/19 9:45 AM Oh dear, Judy! Let's try 16:33. ðŸ™ƒ 21/Oct/19 3:54 PM basics to 42 2. W-wing 18 [d2,f9] => d79<>1 W-wing 17 [c8,g9] => b9<>>7 XY-wing 167 [e8,d9,g9] => f9<>1 => f9=8 W-wing 46 [a4,i9] => i4 <> 6 => i4=5 solve 21/Oct/19 4:25 PM